View Filing Data

Print Document View Excel Document

Document and Entity Information	3 Months Ended	12 Months Ended
Document and Entity Information	Mar. 31, 2012	Dec. 31, 2011
Document and Entity Information [Abstract]
Entity Registrant Name	Koppers Holdings Inc.
Entity Central Index Key	0001315257
Document Type	8-K	8-K
Document Period End Date	Mar. 31, 2012	Dec. 31, 2011
Amendment Flag	false	false

Consolidated Statement of Income - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended									12 Months Ended
	Feb. 15, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement of Income [Abstract]
Net sales		$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Cost of sales (excluding items below)		326.9				296.1					1,335.9	1,055.1	946.6
Depreciation and amortization		6.8				6.4					48.8	28.1	24.8
Selling, general and administrative expenses		18.0				17.7					75.2	63.3	58.1
Operating profit		29.2	(19.2)	40.3	37.1	21.3	15.9	33.5	32.8	16.8	79.0	99.0	94.9
Other income (loss)		0.7				0.0					0.7	1.9	(0.7)
Interest expense		6.9				6.9					27.2	27.1	36.3
Loss on extinguishment of debt											0.0	0.0	22.4
Income before income taxes		23.0				14.4					52.5	73.8	35.5
Income taxes		7.2				5.2					14.9	29.1	13.8
Income from continuing operations		15.8	(14.0)	22.7	19.9	9.2	5.2	15.8	16.3	7.4	37.6	44.7	21.7
(Loss) income from discontinued operations, net of tax benefit (expense)		0.1				(0.2)					0.0	0.0	0.0
Loss on sale of Koppers Arch, net of tax benefit of $0.1											0.0	(0.2)	0.0
Loss on sale of Monessen, net of tax benefit of $0.2											0.0	0.0	(0.3)
Net income		15.9	(14.0)	22.7	19.9	9.0	5.2	15.8	16.1	7.4	37.6	44.5	21.4
Net income attributable to noncontrolling interests		0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers		$ 15.6	$ (14.2)	$ 22.4	$ 19.8	$ 8.9	$ 5.1	$ 15.6	$ 16.1	$ 7.3	$ 36.9	$ 44.1	$ 18.8
Basic -
Continuing operations		$ 0.74				$ 0.44	$ 0.24	$ 0.76	$ 0.79	$ 0.36	$ 1.79	$ 2.15	$ 0.93
Discontinued operations		0.01				(0.01)	0.00	0.00	(0.01)	0.00	0.00	(0.01)	(0.01)
Earnings per basic common share		0.75	$ (0.69)	$ 1.08	$ 0.96	0.43	0.24	0.76	0.78	0.36	1.79	2.14	0.92
Diluted -
Continuing operations		0.74				0.44	0.24	0.75	0.79	0.36	1.77	2.14	0.92
Discontinued operations		0.01				(0.01)	0.00	0.00	(0.01)	0.00	0.00	(0.01)	(0.01)
Earnings per diluted common share		$ 0.75	(0.69)	1.08	0.96	$ 0.43	0.24	0.75	0.78	0.36	$ 1.77	$ 2.13	$ 0.91
Comprehensive income		$ 22.6				$ 16.8					$ 20.1	$ 55.3	$ 47.0
Comprehensive income attributable to noncontrolling interests		0.3				0.2					1.2	0.7	3.5
Comprehensive income attributable to Koppers		$ 22.3				$ 16.6					$ 18.9	$ 54.6	$ 43.5
Weighted average common shares outstanding (in thousands):
Basic		20,669				20,588					20,599	20,543	20,446
Diluted		20,903				20,724					20,833	20,676	20,561
Dividends declared per common share	$ 0.24	$ 0.24	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.88	$ 0.88	$ 0.88

Consolidated Statement of Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement of Income [Abstract]
Discontinued operations, tax (expense) benefit	$ (0.1)	$ 0.2	$ 0.0	$ 0.0	$ 0.0
Loss on sale of Koppers Arch, tax benefit				$ 0.1
Loss on sale of Monessen, tax (benefit) expense					$ 0.2

- Definition

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6909487&loc=d3e38679-109324

+ Details

- Definition

Tax expense or benefit on the gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

+ References + Details

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Income [Abstract]
Net income	$ 15.9	$ (14.0)	$ 22.7	$ 19.9	$ 9.0	$ 5.2	$ 15.8	$ 16.1	$ 7.4	$ 37.6	$ 44.5	$ 21.4
Changes in other comprehensive income (loss):
Currency translation adjustment	5.5				6.9					(2.5)	11.5	24.0
Unrecognized pension transition asset, net of tax of $(0.1), $(0.1) and $(0.1)	0.1				0.0					(0.2)	(0.2)	(0.2)
Unrecognized pension prior service cost, net of tax of $0.0, $0.1 and $0.0										0.1	0.2	(0.1)
Unrecognized pension net (loss) gain, net of tax of $(9.2), $(0.6) and $2.5	1.3				0.9					(14.9)	(0.7)	1.9
Total comprehensive income	22.6				16.8					20.1	55.3	47.0
Comprehensive income attributable to noncontrolling interests	0.3				0.2					1.2	0.7	3.5
Comprehensive income attributable to Koppers	$ 22.3				$ 16.6					$ 18.9	$ 54.6	$ 43.5

Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Income [Abstract]
Unrecognized pension transition asset, tax	$ (0.1)	$ (0.1)	$ (0.1)
Unrecognized pension prior service cost, tax	0.0	0.1	0.0
Unrecognized pension net (loss) gain, tax	$ (9.2)	$ (0.6)	$ 2.5

Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Assets
Cash and cash equivalents	$ 42.6	$ 54.1	$ 40.5	$ 35.3	$ 58.4	$ 63.1
Accounts receivable, net of allowance	191.2	160.9		128.9
Income tax receivable	1.2	10.6		11.9
Inventories, net	178.2	159.0		165.4
Deferred tax assets	9.6	9.3		5.9
Loan to related party	11.7	11.7		0.0
Other current assets	20.2	21.8		23.0
Total current assets	454.7	427.4		370.4
Equity in non-consolidated investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1	61.6
Deferred tax assets	41.5	44.3		26.1
Other assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Liabilities
Accounts payable	96.6	102.1		87.9
Accrued liabilities	60.9	63.1		55.4
Dividends payable	5.6	5.2		5.1
Short-term debt and current portion of long-term debt	0.0	0.0		1.0
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Accrued postretirement benefits	104.8	104.1		86.1
Other long-term liabilities	46.7	46.9		38.4
Total liabilities	628.9	623.5		569.3
Commitments and contingent liabilities
Equity
Senior Convertible Preferred Stock, $0.01 par value per share; 10,000,000 shares authorized; no shares issued	0.0	0.0		0.0
Common Stock, $0.01 par value per share; 40,000,000 shares authorized	0.2	0.2		0.2
Additional paid-in capital	145.1	142.9		137.0
Retained earnings (deficit)	17.2	6.7		(11.7)
Accumulated other comprehensive loss	(23.5)	(30.2)		(12.3)
Treasury stock, at cost	(26.5)	(24.8)		(24.5)
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total equity	125.2	107.2	$ 113.0	99.9	$ 54.8
Total liabilities and equity	$ 754.1	$ 730.7		$ 669.2

Consolidated Balance Sheet (Parenthetical) - USD ($) $ / shares in Units, $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowance	$ 0.2	$ 0.3	$ 0.1
Senior convertible preferred stock, par value	$ 0.01	$ 0.01	$ 0.01
Senior convertible preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Senior convertible preferred stock, shares issued
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000	40,000,000
Common stock, shares issued	21,505,028	21,309,210	21,278,480
Treasury stock, shares	750,613	706,161	700,203	669,000	669,000

Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash provided by (used in) operating activities
Net income	$ 15.9	$ (14.0)	$ 22.7	$ 19.9	$ 9.0	$ 5.2	$ 15.8	$ 16.1	$ 7.4	$ 37.6	$ 44.5	$ 21.4
Adjustments to reconcile net cash provided by operating activities:
Depreciation and amortization	6.8				6.8					48.8	28.1	26.6
Loss on extinguishment of debt										0.0	0.0	22.4
(Gain) loss on sale of assets										(0.2)	(1.0)	0.6
Deferred income taxes	2.0				0.2					(11.3)	5.0	22.9
Non-cash interest expense	0.4				0.4					1.6	1.7	16.4
Equity income of affiliated companies, net of dividends received	(0.5)				0.0					(0.2)	0.0	2.0
Change in other liabilities	2.4				1.2					4.0	(2.5)	6.8
Stock-based compensation	1.5				0.8					5.3	3.3	2.5
Other	0.2				0.0					(3.0)	0.8	0.6
(Increase) decrease in working capital:
Accounts receivable	(28.5)				(39.8)					(33.2)	(19.1)	16.1
Inventories	(16.7)				(5.6)					5.1	8.2	31.5
Accounts payable	(6.5)				11.5					15.3	9.7	(16.8)
Accrued liabilities and other working capital	7.2				6.0					7.1	26.6	(40.7)
Net cash provided by operating activities	(15.8)				(9.5)					76.9	105.3	112.3
Cash provided by (used in) investing activities
Capital expenditures	(3.4)				(4.4)					(33.2)	(29.9)	(18.0)
Acquisitions, net of cash acquired	0.0				(0.6)					(0.6)	(35.5)	(2.2)
Loan to related party										(11.7)	0.0	0.0
Net cash proceeds (payments) from divestitures and asset sales	0.2				0.0					0.8	2.0	(0.6)
Net cash (used in) investing activities	(3.2)				(5.0)					(44.7)	(63.4)	(20.8)
Cash provided by (used in) financing activities
Borrowings of revolving credit	98.1				76.1					218.0	152.1	190.0
Repayments of revolving credit	(86.0)				(51.6)					(211.6)	(192.1)	(150.0)
Borrowings on long-term debt										0.0	0.0	294.9
Repayments on long-term debt	0.0				(0.9)					(1.0)	(0.2)	(405.7)
Issuances of Common Stock	0.6				0.2					0.3	0.1	0.0
Repurchases of Common Stock	(1.7)				(0.2)					(0.3)	(0.9)	0.0
Excess tax benefit from employee stock plans										0.0	0.2	0.0
Payment of deferred financing costs	0.0				(0.5)					(0.5)	(0.4)	(8.1)
Dividends paid	(4.5)				(4.5)					(18.2)	(23.1)	(18.0)
Net cash provided by (used in) financing activities	6.5				18.6					(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0				1.1					(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)				5.2					18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1			$ 40.5	35.3				$ 58.4	35.3	58.4	63.1
Cash and cash equivalents at end of year	$ 42.6	$ 54.1			$ 40.5	$ 35.3				54.1	35.3	58.4
Supplemental disclosure of cash flows information:
Interest										25.8	25.5	19.8
Income taxes										25.7	(3.9)	26.1
Noncash investing and financing activities:
Capital leases										$ 0.0	$ 0.1	$ 0.0

Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions	Total	Senior Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Currency Translation Adjustment [Member]	Unrecognized Pension Transition Asset [Member]	Unrecognized Pension Prior Service Cost [Member]	Unrecognized Pension Net Loss [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total Koppers Shareholders' Equity - End Of Year [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2008				$ 126.6	$ (37.8)	$ (2.5)	$ 0.9	$ (0.4)	$ (45.4)		$ (23.6)		$ 8.0
Employee stock plans				0.6
Net income attributable to Koppers	$ 18.8				18.8
Common Stock dividends					(18.3)
Change in currency translation adjustment	24.0					23.1							0.9
Change in unrecognized pension transition asset, net of tax	0.2						(0.2)
Change in unrecognized pension prior service cost, net of tax	(0.1)							(0.1)
Change in unrecognized pension net loss, net of tax	1.9								1.9
Purchases											0.0
Net income attributable to noncontrolling interests	2.6												2.6
Dividends to noncontrolling interests													(0.5)
Balance at Dec. 31, 2009		$ 0.0	$ 0.2	127.2	(37.3)	20.6	0.7	(0.5)	(43.5)	$ (22.7)	(23.6)	$ 43.8	11.0
Total equity	54.8
Employee stock plans				9.8
Net income attributable to Koppers	44.1				44.1
Common Stock dividends					(18.5)
Change in currency translation adjustment	11.5					11.1							0.4
Change in unrecognized pension transition asset, net of tax	0.2						(0.2)
Change in unrecognized pension prior service cost, net of tax	0.2							0.2
Change in unrecognized pension net loss, net of tax	(0.7)								(0.7)
Purchases											(0.9)
Net income attributable to noncontrolling interests	0.4												0.4
Dividends to noncontrolling interests													(0.6)
Balance at Dec. 31, 2010	88.7	0.0	0.2	137.0	(11.7)	31.7	0.5	(0.3)	(44.2)	(12.3)	(24.5)	88.7	11.2
Total equity	99.9											88.7	11.2
Net income attributable to Koppers	8.9
Change in currency translation adjustment	6.9
Change in unrecognized pension transition asset, net of tax	0.0
Change in unrecognized pension net loss, net of tax	0.9
Net income attributable to noncontrolling interests	0.1
Balance at Dec. 31, 2010	88.7	0.0	0.2	137.0	(11.7)	31.7	0.5	(0.3)	(44.2)	(12.3)	(24.5)	88.7	11.2
Employee stock plans				5.9
Net income attributable to Koppers	36.9				36.9
Common Stock dividends					(18.5)
Change in currency translation adjustment	(2.5)					(2.9)							0.5
Change in unrecognized pension transition asset, net of tax	0.2						(0.2)
Change in unrecognized pension prior service cost, net of tax	0.1							0.1
Change in unrecognized pension net loss, net of tax	(14.9)								(14.9)
Purchases											(0.3)
Net income attributable to noncontrolling interests	0.7												0.7
Dividends to noncontrolling interests													0.0
Balance at Dec. 31, 2011	94.8	$ 0.0	$ 0.2	$ 142.9	$ 6.7	$ 28.8	$ 0.3	$ (0.2)	$ (59.1)	$ (30.2)	$ (24.8)	94.8	12.4
Total equity	113.0											101.6	11.4
Total equity	107.2											94.8	12.4
Net income attributable to Koppers	15.6
Change in currency translation adjustment	5.5
Change in unrecognized pension transition asset, net of tax	(0.1)
Change in unrecognized pension net loss, net of tax	1.3
Net income attributable to noncontrolling interests	0.3
Balance at Mar. 31, 2012	112.5
Total equity	$ 125.2											$ 112.5	$ 12.7

Basis of Presentation and New Accounting Standards

3 Months Ended

Mar. 31, 2012

Basis of Presentation and New Accounting Standards [Abstract]

Basis of Presentation and New Accounting Standards

1. Basis of Presentation and New Accounting Standards

The accompanying unaudited condensed consolidated financial statements and related disclosures have been prepared in accordance with accounting principles generally accepted in the United States applicable to interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation of Koppers Holdings Inc.’s and its subsidiaries’ (“Koppers”, “Koppers Holdings” or the “Company”) financial position and interim results as of and for the periods presented have been included. All such adjustments are of a normal recurring nature unless disclosed otherwise. Because the Company’s business is seasonal, results for interim periods are not necessarily indicative of those that may be expected for a full year. The Condensed Consolidated Balance Sheet for December 31, 2011 has been summarized from the audited balance sheet contained in the Annual Report on Form 10-K for the year ended December 31, 2011.

The financial information included herein should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in its Annual Report on Form 10-K for the year ended December 31, 2011.

In June 2011, the FASB issued Accounting Standards Update No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income (ASU 2011-05). The amendments in ASU 2011-05 require entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. ASU 2011-05 is effective for interim and annual periods beginning after December 15, 2011.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 915
-SubTopic 235
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472506&loc=d3e38932-110933

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2209116

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6970148&loc=SL6228881-111685

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2122150

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2122524

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2134480

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Dividends

3 Months Ended

Mar. 31, 2012

Dividends [Abstract]

Dividends

2. Dividends

On May 3, 2012, the Company’s board of directors declared a quarterly dividend of 24 cents per common share, payable on July 9, 2012 to shareholders of record as of May 15, 2012.

Discontinued operations

3 Months Ended

Mar. 31, 2012

Discontinued operations [Abstract]

Discontinued operations

3. Discontinued operations

In December 2011, the Company ceased manufacturing operations at its carbon black facility located in Kurnell, Australia. This business was reclassified to discontinued operations in the first quarter of 2012 as run-off activities were completed. This decision was made as a result of deteriorating business conditions including raw material availability and cost, competition in the export markets due to the strength of the Australian dollar and a variety of other factors. The costs related to this closure totaled $41.0 million in the fourth quarter of 2011, of which $20.8 million was recorded as a component of cost of sales and $20.2 million was recorded as a component of depreciation and amortization. The Company estimates that total future closure costs related to this facility will be approximately $1.6 million. The closure is expected to be completed by 2014. The facility is part of the Carbon Materials & Chemicals segment.

Details of the restructuring activities and related reserves for 2012 are as follows:


	Severance and employee benefits			Environmental remediation		Inventory writedowns			Site demolition		Other			Total
(Dollars in millions)
Reserve at December 31, 2011	$	1.8		$	6.7	$	0.0		$	6.2	$	1.2		$	15.9
Charges		0.0			0.0		0.3			0.0		0.0			0.3
Costs charged against assets		0.0			0.0		(0.3	)		0.0		0.0			(0.3	)
Reversals		(0.1	)		0.0		0.0			0.0		0.0			(0.1	)
Cash paid		(0.9	)		0.0		0.0			0.0		(0.2	)		(1.1	)
Currency translation		0.0			0.2		0.0			0.2		0.0			0.4

Reserve at March 31, 2012	$	0.8		$	6.9	$	0.0		$	6.4	$	1.0		$	15.1

Net sales and operating profit from discontinued operations for the three months ended March 31, 2012 and 2011 consist of the following amounts:


	Three Months Ended March 31,
	2012		2011
Net sales	$	5.1	$	17.6
Operating profit		0.3		(0.5	)

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2443-110228

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

+ Details

Fair Value Measurements

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

4. Fair Value Measurements

Carrying amounts and the related estimated fair values of the Company’s financial instruments as of March 31, 2012 and December 31, 2011 are as follows:


	March 31, 2012				December 31, 2011
	Fair Value		Carrying Value		Fair Value		Carrying Value
(Dollars in millions)
Financial assets:
Cash and cash equivalents, including restricted cash	$	42.6	$	42.6	$	54.1	$	54.1
Investments and other assets^(a)		1.3		1.3		1.3		1.3
Financial liabilities:
Long-term debt (including current portion)	$	340.3	$	314.3	$	324.4	$	302.1

(a)

Excludes equity method investments.

Cash and cash equivalents – The carrying amount approximates fair value because of the short maturity of those instruments.

Investments and other assets – Represents the broker-quoted cash surrender value on universal life insurance policies. This asset is classified as Level 2 in the valuation hierarchy and is measured from values received from financial institutions.

Debt – The fair value of the Company’s long-term debt is estimated based on the market prices for the same or similar issues or on the current rates offered to the Company for debt of the same remaining maturities (Level 2). The fair values of the revolving credit facility approximate carrying value due to the variable rate nature of these instruments.

17. Fair Value of Financial Instruments

Carrying amounts and the related estimated fair values of the Company’s financial instruments as of December 31, 2011 and 2010 are as follows:


	December 31, 2011				December 31, 2010
	Fair Value		Carrying Value		Fair Value		Carrying Value
(Dollars in millions)
Financial assets:
Cash and cash equivalents	$	54.1	$	54.1	$	35.3	$	35.3
Investments and other assets^(a)		1.3		1.3		1.3		1.3
Financial liabilities:
Long-term debt (including current portion)	$	324.4	$	302.1	$	324.5	$	296.4

(a)

Excludes equity method investments.

Cash – The carrying amount approximates fair value because of the short maturity of those instruments.

Investments and other assets – Represents the broker-quoted cash surrender value on life insurance policies. The cash surrender value asset is classified as Level 2 in the valuation hierarchy and is measured from values received from the insuring entity.

Long-term debt – The fair value of the Company’s long-term debt is estimated based on the market prices for the same or similar issues or on the current rates offered to the Company for debt of the same remaining maturities (Level 2). The fair values of the revolving credit facility approximate carrying value due to the variable rate nature of these instruments.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Comprehensive Income and Equity

3 Months Ended

Mar. 31, 2012

Comprehensive Income and Equity [Abstract]

Comprehensive Income and Equity

5. Comprehensive Income and Equity

Total comprehensive income for the three months ended March 31, 2012 and 2011 is summarized in the table below:


	Three Months Ended March 31,
	2012			2011
(Dollars in millions)
Net income	$	15.9		$	9.0
Other comprehensive income (loss):
Change in currency translation adjustment		5.5			6.9
Change in unrecognized pension net loss, net of tax		1.3			0.9
Change in unrecognized transition asset, net of tax		(0.1	)		0.0

Total comprehensive income		22.6			16.8
Less: comprehensive income attributable to noncontrolling interests		0.3			0.2

Comprehensive income attributable to Koppers	$	22.3		$	16.6

The following tables present the change in equity for the three months ended March 31, 2012 and 2011, respectively:


(Dollars in millions)	Total Koppers Shareholders’ Equity’			Noncontrolling Interests		Total Equity
Balance at December 31, 2011	$	94.8		$	12.4	$	107.2
Net income		15.6			0.3		15.9
Issuance of common stock		0.6			0.0		0.6
Employee stock plans		1.6			0.0		1.6
Other comprehensive income		6.7			0.0		6.7
Dividends		(5.1	)		0.0		(5.1	)
Repurchases of common stock		(1.7	)		0.0		(1.7	)

Balance at March 31, 2012	$	112.5		$	12.7	$	125.2


(Dollars in millions)	Total Koppers Shareholders’ Equity’			Noncontrolling Interests		Total Equity
Balance at December 31, 2010	$	88.7		$	11.2	$	99.9
Net income		8.9			0.1		9.0
Issuance of common stock		0.2			0.0		0.2
Employee stock plans		0.9			0.0		0.9
Other comprehensive income		7.7			0.1		7.8
Dividends		(4.6	)		0.0		(4.6	)
Repurchases of common stock		(0.2	)		0.0		(0.2	)

Balance at March 31, 2011	$	101.6		$	11.4	$	113.0

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Earnings And Dividends Per Common Share

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Earnings And Dividends Per Common Share [Abstract]

Earnings and Dividends Per Common Share

6. Earnings per Common Share

The computation of basic earnings per common share for the periods presented is based upon the weighted average number of common shares outstanding during the periods. The computation of diluted earnings per common share includes the effect of non-vested nonqualified stock options and restricted stock units assuming such options and stock units were outstanding common shares at the beginning of the period. The effect of antidilutive securities is excluded from the computation of diluted earnings per common share.

The following table sets forth the computation of basic and diluted earnings per common share:


	Three Months Ended March 31,
	2012		2011
(Dollars in millions, except share amounts, in thousands, and per share amounts)
Net income attributable to Koppers	$	15.6	$	8.9
Less: Income (loss) from discontinued operations		0.1	$	(0.2	)

Income from continuing operations attributable to Koppers	$	15.5	$	9.1

Weighted average common shares outstanding:
Basic		20,669		20,588
Effect of dilutive securities		234		136

Diluted		20,903		20,724

Earnings per common share – continuing operations:
Basic earnings per common share	$	0.74	$	0.44
Diluted earnings per common share		0.74		0.44

Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		181		95

5. Earnings and Dividends per Common Share

The computation of basic earnings per common share for the periods presented is based upon the weighted average number of common shares outstanding during the periods. The computation of diluted earnings per common share includes the effect of nonvested nonqualified stock options and restricted stock units assuming such options and stock units were outstanding common shares at the beginning of the period. The effect of antidilutive securities and performance restricted stock units that have not met vesting criteria are excluded from the computation of diluted earnings per common share.

The following table sets forth the computation of basic and diluted earnings per common share:


	Year Ended December 31,
	2011			2010			2009
(Dollars in millions, except share amounts, in thousands, and per share amounts)
Net income attributable to Koppers	$	36.9		$	44.1		$	18.8
Less: discontinued operations		(19.9	)		(0.1	)		0.0

Income from continuing operations attributable to Koppers	$	56.8		$	44.2		$	18.8

Weighted average common shares outstanding:
Basic		20,599			20,543			20,446
Effect of dilutive securities		234			133			115

Diluted		20,833			20,676			20,561

Earnings per common share – continuing operations:
Basic earnings per common share	$	2.75		$	2.14		$	0.92
Diluted earnings per common share		2.72			2.13			0.91

Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		106			154			103

On February 15, 2012, the board of directors declared a quarterly dividend of 24 cents per common share, payable on April 9, 2012 to shareholders of record as of February 28, 2012.

Stock-Based Compensation

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Stock-Based Compensation

7. Stock-based Compensation

The amended and restated 2005 Long-Term Incentive Plan (the “LTIP”) provides for the grant to eligible persons of stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance awards, dividend equivalents and other stock-based awards, which are collectively referred to as the awards.

Under the LTIP, the board of directors granted restricted stock units and performance stock units to certain employee participants (collectively, the “stock units”) each year starting in 2007. The restricted stock units vest on the third anniversary of the grant date, assuming continued employment by the participant. Performance stock units granted in 2011 and 2010 each have a two-year performance objective. Performance stock units granted in 2012 have a three-year performance objective. Regardless of whether the measurement period for the applicable performance objective is two or three years, all performance stock units have a three-year period for vesting (if the applicable performance objective is obtained). The applicable performance objective is based upon a multi-year cumulative value creation calculation commencing on the first day of each grant year. The number of performance stock units granted represents the target award and participants have the ability to earn between zero and 150 percent of the target award based upon actual performance. If minimum performance criteria are not achieved, no performance stock units will vest. The performance stock units originally awarded in 2009 vested at 59.5 percent of target in February 2012. The performance stock units originally awarded in 2010 achieved a performance outcome of 128.2 percent of target and will vest in 2013, assuming continued service by the participants.

Dividends declared on the Company’s common stock during the restriction period of the stock units are credited at equivalent value as additional stock units and become payable as additional common shares upon vesting. In the event of termination of employment, other than retirement, death or disability, any non-vested stock units are forfeited, including additional stock units credited from dividends. In the event of termination of employment due to retirement, death or disability, pro-rata vesting of the stock units over the service period will result. There are special vesting provisions for the stock units related to a change in control.

Restricted stock units that vest immediately or have one-year vesting periods are also issued under the LTIP to members of the board of directors in connection with annual director compensation and, from time to time, are issued to members of management in connection with employee compensation.

Compensation expense for non-vested stock units is recorded over the vesting period based on the fair value at the date of grant. The fair value of stock units is the market price of the underlying common stock on the date of grant.

The following table shows a summary of the performance stock units with uncompleted performance periods as of March 31, 2012:


Performance Period	Minimum Shares		Target Shares		Maximum Shares
2011 – 2012		0		88,010		132,015
2012 – 2014		0		104,598		156,897

The following table shows a summary of the status and activity of non-vested stock awards for the three months ended March 31, 2012:


	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at January 1, 2012		156,665			297,715			454,380		$	26.43
Granted		52,046			104,598			156,644		$	38.21
Credited from dividends		3,358			7,072			10,430		$	35.74
Performance stock unit adjustment		0			(40,112	)		(40,112	)	$	10.68
Vested		(69,243	)		(87,013	)		(156,256	)	$	16.42
Forfeited		(1,022	)		(1,523	)		(2,545	)	$	36.43
Non-vested at March 31, 2012		141,804			280,737			422,541		$	36.16

Stock options to executive officers vest and become exercisable upon the completion of a three-year service period commencing on the grant date. The stock options have a term of 10 years. In the event of termination of employment, other than retirement, death or disability, any non-vested options are forfeited. In the event of termination of employment due to retirement, death or disability, pro-rata vesting of the options over the service period will result. There are special vesting provisions for the stock options related to a change in control.

In accordance with accounting standards, compensation expense for non-vested stock options is recorded over the vesting period based on the fair value at the date of grant. The fair value of stock options on the date of grant is calculated using the Black-Scholes-Merton model and the assumptions listed below:


	February 2012 Grant			February 2011 Grant			August 2010 Grant			February 2010 Grant
Grant date price per share of option award	$	38.21		$	40.26		$	20.00		$	28.10
Expected dividend yield per share		2.75	%		2.50	%		2.50	%		2.50	%
Expected life in years		6.5			6.5			6.5			6.5
Expected volatility		55.06	%		60.00	%		62.00	%		62.00	%
Risk-free interest rate		1.34	%		3.02	%		3.05	%		3.05	%
Grant date fair value per share of option awards	$	15.82		$	19.28		$	9.82		$	13.81

The dividend yield is based on the Company’s current and prospective dividend rate which calculates a continuous dividend yield based upon the market price of the underlying common stock. The expected life in years is based on the simplified method permitted under Securities and Exchange Commission Staff Accounting Bulletin No. 14d.2 which calculates the average of the weighted vesting term and the contractual term of the option. This method was selected due to the lack of historical exercise data with respect to the Company. Expected volatility is based on the historical volatility of the Company’s common stock and the historical volatility of certain other similar public companies. The risk-free interest rate is based on U.S. Treasury bill rates for the expected life of the option.

The following table shows a summary of the status and activity of stock options for the three months ended March 31, 2012:


	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2012		353,452		$	27.65
Granted		95,899		$	38.21
Exercised		(39,562	)	$	15.26
Outstanding at March 31, 2012		409,789		$	31.32		7.71	$	3.2
Exercisable at March 31, 2012		183,419			$25.39		6.04		$2.5

Total stock-based compensation expense recognized for the three months ended March 31, 2012 and 2011 is as follows:


	Three Months Ended March 31,
	2012		2011
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	1.5	$	0.8
Less related income tax benefit		0.6		0.3

	$	0.9	$	0.5

As of March 31, 2012, total future compensation expense related to non-vested stock-based compensation arrangements totaled $13.5 million and the weighted-average period over which this cost is expected to be recognized is approximately 28 months.

6. Stock-based Compensation

Under the LTIP, the board of directors granted restricted stock units and performance stock units to certain employee participants (collectively, the “stock units”) each year starting in 2007. The restricted stock units vest on the third anniversary of the grant date, assuming continued employment by the participant. Performance stock units granted in 2011 and 2010 each have a two-year performance objective. Performance stock units granted before 2010 have three-year performance objectives. Regardless of whether the measurement period for the applicable performance objective is two or three years, all performance stock units have a three-year period for vesting (if the applicable performance objective is obtained). The applicable performance objective is based upon a multi-year cumulative value creation calculation commencing on the first day of each grant year. The number of performance stock units granted represents the target award and participants have the ability to earn between zero and 150 percent of the target award based upon actual performance. If minimum performance criteria are not achieved, no performance stock units will vest. The performance stock units originally awarded in 2008 did not vest in 2011 as the related performance objectives were not achieved.

The following table shows a summary of the performance stock units as of December 31, 2011:


Performance Period	Minimum Shares		Target Shares		Maximum Shares
2009 – 2011		0		134,928		202,392
2010 – 2011		0		65,411		98,117
2011 – 2012		0		89,056		133,584

The following table shows a summary of the status and activity of non-vested stock awards for the year ended December 31, 2011:


	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at January 1, 2011		121,397			257,002			378,399		$	23.31
Granted		60,501			93,115			153,616		$	40.41
Credited from dividends		3,627			7,693			11,320		$	27.31
Performance stock unit adjustment		0			(50,600	)		(50,600	)	$	38.92
Vested		(23,580	)		0			(23,580	)	$	38.92
Forfeited		(5,280	)		(9,495	)		(14,775	)	$	29.96

Non-vested at December 31, 2011		156,665			297,715			454,380		$	26.43


	February 2011 Grant			August 2010 Grant			February 2010 Grant			February 2009 Grant
Grant date price per share of option award	$	40.26		$	20.00		$	28.10		$	15.26
Expected dividend yield per share		2.50	%		2.50	%		2.50	%		2.50	%
Expected life in years		6.5			6.5			6.5			6.5
Expected volatility		60.00	%		62.00	%		62.00	%		51.00	%
Risk-free interest rate		3.02	%		3.05	%		3.05	%		2.05	%
Grant date fair value per share of option awards	$	19.28		$	9.82		$	13.81		$	6.19

The following table shows a summary of the status and activity of stock options for the year ended December 31, 2011:


	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2011		291,591		$	24.63
Granted		73,910		$	40.26
Exercised		(7,150	)	$	29.97
Forfeited		(4,899	)	$	34.64

Outstanding at December 31, 2011		353,452		$	27.65		7.27	$	3.0

Exercisable at December 31, 2011		95,568		$	34.70		5.51	$	0.2

Total stock-based compensation expense recognized for the three years ended December 31, 2011 is as follows:


	Year Ended December 31,
	2011		2010		2009
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	5.3	$	3.3	$	2.5
Less related income tax benefit		2.0		1.3		1.0

Decrease in net income attributable to Koppers	$	3.3	$	2.0	$	1.5

As of December 31, 2011, total future compensation expense related to non-vested stock-based compensation arrangements totaled $7.3 million and the weighted-average period over which this expense is expected to be recognized is approximately 23 months.

Segment Information

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Segment Information [Abstract]

Segment Information

8. Segment Information

The Company has two reportable segments: Carbon Materials & Chemicals and Railroad & Utility Products. The Company’s reportable segments are business units that offer different products. The reportable segments are each managed separately because they manufacture and distribute distinct products with different production processes. The business units have been aggregated into two reportable segments since management believes the long-term financial performance of these business units is affected by similar economic conditions.

The Company’s Carbon Materials & Chemicals segment is primarily a manufacturer of carbon pitch, naphthalene, phthalic anhydride, creosote and carbon black feedstock. Carbon pitch is a critical raw material used in the production of aluminum and for the production of steel in electric arc furnaces. Naphthalene is used for the production of phthalic anhydride and as a surfactant in the production of concrete. Phthalic anhydride is used in the production of plasticizers, polyester resins and alkyd paints. Creosote is used in the treatment of wood and carbon black feedstock is used in the production of carbon black.

The Company’s Railroad & Utility Products segment sells treated and untreated wood products, manufactured products and services primarily to the railroad and public utility markets. Railroad products include procuring and treating items such as crossties, switch ties and various types of lumber used for railroad bridges and crossings and the manufacture of rail joint bars. Utility products include transmission and distribution poles and pilings.

The Company evaluates performance and determines resource allocations based on a number of factors, the primary measure being operating profit or loss from operations. Operating profit does not include equity in earnings of affiliates, other income, interest expense or income taxes. Operating profit also excludes the operating costs of Koppers Holdings Inc., the parent company of Koppers Inc. The accounting policies of the reportable segments are the same as those described in the summary of significant accounting policies. Intersegment transactions are eliminated in consolidation.

The following table sets forth certain sales and operating data, net of all intersegment transactions, for the Company’s segments for the periods indicated:


	Three Months Ended March 31,
	2012			2011
(Dollars in millions)
Revenues from external customers:
Carbon Materials & Chemicals	$	249.5		$	218.6
Railroad & Utility Products		131.4			122.9

Total	$	380.9		$	341.5

Intersegment revenues:
Carbon Materials & Chemicals	$	30.0		$	27.5

Depreciation and amortization expense:
Carbon Materials & Chemicals	$	4.1		$	4.3
Railroad & Utility Products		2.7			2.1

Total	$	6.8		$	6.4

Operating profit:
Carbon Materials & Chemicals	$	20.5		$	14.1
Railroad & Utility Products		9.1			7.5
Corporate		(0.4	)		(0.3	)

Total	$	29.2		$	21.3

The following table sets forth certain tangible and intangible assets allocated to each of the Company’s segments as of the dates indicated:


	March 31, 2012		December 31, 2011
(Dollars in millions)
Segment assets:
Carbon Materials & Chemicals	$	510.2	$	495.2
Railroad & Utility Products		185.1		164.6
All other		58.8		70.9

Total	$	754.1	$	730.7

Goodwill:
Carbon Materials & Chemicals	$	70.2	$	69.4
Railroad & Utility Products		2.8		2.7

Total	$	73.0	$	72.1

8. Segment Information

Results of Segment Operations


	Year Ended December 31,
	2011			2010			2009
(Dollars in millions)
Revenues from external customers:
Carbon Materials & Chemicals	$	943.1		$	740.6		$	606.0
Railroad & Utility Products		523.1			449.9			469.2

Total	$	1,466.2		$	1,190.5		$	1,075.2

Intersegment revenues:
Carbon Materials & Chemicals	$	95.2		$	97.2		$	91.5

Depreciation & amortization:
Carbon Materials & Chemicals	$	17.4		$	17.2		$	15.9
Railroad & Utility Products		9.5			9.4			7.3

Total	$	26.9		$	26.6		$	23.2

Operating profit:
Carbon Materials & Chemicals	$	89.1		$	76.7		$	57.3
Railroad & Utility Products		34.8			23.0			38.2
Corporate^(a)		(1.2	)		(1.6	)		(1.8	)

Total	$	122.7		$	98.1		$	93.7

Capital expenditures (including acquisitions):
Carbon Materials & Chemicals	$	23.0		$	44.9		$	10.7
Railroad & Utility Products		10.2			20.2			8.5
Corporate		0.6			0.3			1.0

Total	$	33.8		$	65.4		$	20.2

^(a)

Operating loss for Corporate includes general and administrative costs for Koppers Holdings Inc, the parent company of Koppers Inc.

Assets and Goodwill by Segment


	December 31,
	2011		2010
(Dollars in millions)
Assets:
Carbon Materials & Chemicals	$	495.2	$	447.4
Railroad & Utility Products		164.6		154.8

Segment assets		659.8		602.2
Cash & cash equivalents		0.2		8.5
Income tax receivable		10.6		11.9
Deferred taxes		41.8		27.1
Deferred financing costs		8.2		9.1
Deferred charges		3.5		4.0
Other		6.6		6.4

Total	$	730.7	$	669.2

Goodwill:
Carbon Materials & Chemicals	$	69.4	$	69.6
Railroad & Utility Products		2.7		2.5

Total	$	72.1	$	72.1

Revenues and Long-lived Assets by Geographic Area


	Year		Revenue		Long-lived assets
(Dollars in millions)
United States		2011	$	787.5	$	161.6
		2010		672.5		157.1
		2009		649.1		149.1
Australasia		2011		276.6		58.7
		2010		221.9		79.8
		2009		190.2		73.4
Europe		2011		248.0		35.7
		2010		194.0		35.8
		2009		144.1		14.9
Other countries		2011		154.1		0.0
		2010		102.1		0.0
		2009		91.8		0.0

Total		2011	$	1,466.2	$	256.0
		2010	$	1,190.5	$	272.7
		2009	$	1,075.2	$	237.4

Revenues by geographic area in the above table are attributed by the destination country of the sale. Revenues from non-U.S. countries totaled $681.1 million in 2011, $573.0 million in 2010 and $475.3 million in 2009. Revenues from one customer of the Carbon Materials & Chemicals segment and one customer from the Railroad & Utility Products segment represented approximately 11 percent each of the Company’s consolidated revenues in 2009.

Segment Revenues for Significant Product Lines


	Year Ended December 31,
	2011		2010		2009
(Dollars in millions)
Carbon Materials & Chemicals:
Carbon pitch	$	431.1	$	325.6	$	302.9
Creosote and carbon black feedstock		162.0		104.4		76.3
Phthalic anhydride		112.4		93.9		67.3
Naphthalene		72.3		68.0		49.8
Other products		165.3		148.7		109.7

		943.1		740.6		606.0
Railroad & Utility Products:
Railroad crossties		324.9		282.5		298.1
Utility poles		84.2		73.3		66.8
Creosote		52.7		57.9		60.6
Rail joint bars		24.7		0.1		0.0
Other products		36.6		36.1		43.7

		523.1		449.9		469.2

Total	$	1,466.2	$	1,190.05	$	1,075.2

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Income Taxes

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

9. Income Taxes

Effective Tax Rate

Income taxes as a percentage of pretax income was 32.8 percent and 36.3 percent for each of the three months ended March 31, 2012 and 2011, respectively, before discrete items. Discrete items included in income taxes for the three months ended March 31, 2012 consisted of a net tax benefit of $0.3 million due primarily to amended tax returns and deferred tax adjustments. There were no discrete items included in income taxes for the three months ended on March 31, 2011.

The effective tax rate for the three months ended on March 31, 2012 differs from the U.S. federal statutory rate of 35.0 percent due to the taxes on foreign earnings (-3.5 percent) and the domestic manufacturing deduction (-1.5 percent) partially offset by nondeductible expenses (+0.6 percent), state taxes (+1.4 percent) and uncertain tax positions (+0.8 percent). With respect to the three months ended on March 31, 2011, the effective tax rate differs from the federal statutory rate primarily due to nondeductible expenses (+0.6 percent), state taxes (+1.1 percent) and uncertain tax positions (+0.9 percent) partially offset by the domestic manufacturing deduction (-1.3 percent).

The income tax provision for interim periods is based on an estimated annual effective tax rate, which requires management to make its best estimate of annual pretax income by domestic and foreign jurisdictions and other items that impact taxable income. During the year, management regularly updates estimates based on changes in various factors such as product prices, shipments, product mix, operating and administrative costs, earnings mix by taxable jurisdiction, repatriation of foreign earnings, uncertain tax positions and the ability to claim tax credits. To the extent that actual results vary from the estimates at the end of the first quarter, the actual tax provision recognized for 2012 could be materially different from the forecasted annual tax provision as of the end of the first quarter.

Uncertain Tax Positions

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, individual U.S. state jurisdictions and non-U.S. jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2005.

As of March 31, 2012 and December 31, 2011, the total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate, was approximately $7.3 million and $7.1 million, respectively. Unrecognized tax benefits totaled $10.1 million and $9.9 million as of March 31, 2012 and December 31, 2011, respectively. The Company recognizes interest expense and any related penalties from uncertain tax positions in income tax expense. As of March 31, 2012 and December 31, 2011 the Company had accrued approximately $1.0 million and $0.9 million for interest and penalties, respectively.

7. Income Taxes

Income Tax Provision

Components of the Company’s income tax provision from continuing operations are as follows:


	Years Ended December 31,
	2011			2010		2009
(Dollars in millions)
Current:
Federal	$	24.7		$	10.0	$	(21.3	)
State		1.1			0.4		0.1
Foreign		21.5			13.3		11.4

Total current tax provision (benefit)		47.3			23.7		(9.8	)
Deferred:
Federal		(6.7	)		4.1		22.7
State		0.1			0.3		(0.7	)
Foreign		(2.0	)		0.8		1.2

Total deferred tax provision		(8.6	)		5.2		23.2

Total income tax provision	$	38.7		$	28.9	$	13.4

Income before income taxes for 2011, 2010 and 2009 included $51.8 million, $51.0 million and $41.8 million, respectively, from foreign operations.

The provision for income taxes is reconciled with the federal statutory rate as follows:


	Years Ended December 31,
	2011			2010			2009
Federal income tax rate		35.0	%		35.0	%		35.0	%
State income taxes, net of federal tax benefit		0.7			0.7			(1.2	)
Foreign earnings taxed at different rates		1.4			2.4			4.9
Domestic production activities deduction		(1.3	)		(0.7	)		0.0
Non-deductible fines and penalties		0.2			0.0			1.1
Deferred tax adjustments		0.1			0.0			(0.9	)
Change in tax contingency reserves		3.8			0.2			0.3
Other		0.3			1.7			(0.7	)

		40.2	%		39.3	%		38.5	%

The Company has not provided any U.S. tax on undistributed earnings of foreign subsidiaries or joint ventures that are reinvested indefinitely. For the year ended December 31, 2008, the Company provided deferred tax on 2008 undistributed earnings of its European subsidiaries. Subsequent to 2008, deferred taxes were not provided on undistributed European earnings as these earnings are permanently reinvested. At December 31, 2011 consolidated retained earnings of the Company included approximately $94 million of undistributed earnings, which are permanently invested, from these foreign entities. It is not practical at this time, however, to estimate the amount of taxes that may be payable on the distribution of these earnings.

Taxes Excluded from Net Income Attributable to Koppers

The amount of income tax (benefit) provision included in comprehensive income but excluded from net income attributable to Koppers relating to adjustments to reflect the unfunded status of employee post-retirement benefit plans is $9.1 million, $(0.6) million and $2.4 million for the years ended December 31, 2011, 2010 and 2009, respectively.

The amount of income tax benefit included in shareholders’ equity but excluded from net income attributable to Koppers relating to the expense for restricted stock and employee stock options recognized differently for financial and tax reporting purposes was $0.2 million for the year ended December 31, 2010.

Deferred Tax Assets and Liabilities

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.

Significant components of the Company’s deferred tax assets and liabilities are as follows:


	December 31,
	2011			2010
(Dollars in millions)
Deferred tax assets:
Pension and other postretirement benefits obligations	$	38.7		$	30.9
Reserves, including insurance, environmental and deferred revenue		29.8			12.0
Net operating loss benefit		11.2			10.6
Accrued employee compensation		10.7			8.6
Asset retirement obligations		5.1			4.9
Book/tax inventory accounting differences		1.6			1.8
Capital loss benefit		1.5			2.0
Tax credits		0.4			0.3
Excess tax basis on Koppers Australia assets		0.2			0.9
Other		2.4			4.1
Valuation allowance		(10.2	)		(11.4	)

Total deferred tax assets		91.4			64.7
Deferred tax liabilities:
Tax over book depreciation and amortization		27.6			23.1
Unremitted earnings of foreign subsidiaries		6.1			5.9
Tax/book inventory accounting differences		1.7			1.9
Other		5.5			4.3

Total deferred tax liabilities		40.9			35.2

Net deferred tax assets	$	50.5		$	29.5

A valuation allowance is provided when it is more likely than not that some portion or all of the deferred tax assets will not be realized. At December 31, 2011, the Company has recorded a valuation allowance of $8.7 million for certain state net operating loss carryforwards anticipated to produce no tax benefit. Additionally, the Company has recorded a valuation allowance of $1.5 million for certain capital loss carryforwards in Australia expected to produce no benefit. The Company has tax-effected state net operating losses of $14.3 million, which will expire from 2014 to 2030 and tax-effected foreign net operating losses of 2.0 million, a portion of which expires in 2019.

Uncertain Tax Positions

The Company or one of its subsidiaries files income tax returns in U.S. federal jurisdiction, individual U.S. state jurisdictions and non-U.S. jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2005.

As of December 31, 2011 and 2010, the total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate, was approximately $7.1 million and $3.5 million, respectively. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


	December 31,
	2011			2010			2009
(Dollars in millions)
Balance at beginning of year	$	6.5		$	4.0		$	4.0
Additions based on tax provisions related to the current year		4.0			0.4			0.5
Additions for tax provisions of prior years		0.0			2.6			0.0
Reductions as a result of a lapse of the applicable statute of limitations		(0.6	)		(0.5	)		(0.5	)

Balance at end of year	$	9.9		$	6.5		$	4.0

The Company recognizes interest expense and any related penalties from uncertain tax positions in income tax expense. For each year ended December 31, 2011, 2010 and 2009, the Company recognized $0.2 million $0.2 million and $0.1 million, respectively, in interest and penalties. As of December 31, 2011 and 2010, the Company had accrued approximately $0.9 million and $0.7 million for interest and penalties, respectively.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Inventories

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Inventories [Abstract]

Inventories

10. Inventories

Net inventories as of March 31, 2012 and December 31, 2011 are summarized in the table below:


	March 31, 2012		December 31, 2011
(Dollars in millions)
Raw materials	$	105.2	$	91.5
Work in process		22.1		20.1
Finished goods		99.4		95.1

		226.7		206.7
Less revaluation to LIFO		48.5		47.7

Net	$	178.2	$	159.0

9. Inventories

Inventories as of December 31, 2011 and 2010 were as follows:


	December 31,
	2011		2010
(Dollars in millions)
Raw materials	$	91.5	$	107.6
Work in process		20.1		7.6
Finished goods		95.1		95.0

		206.7		210.2
Less revaluation to LIFO		47.7		44.8

Net	$	159.0	$	165.4

For the year ended December 31, 2011 and 2009, liquidations of LIFO inventories increased operating profit by $0.3 million and $1.2 million, respectively.

Property, Plant and Equipment

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

11. Property, Plant and Equipment

Property, plant and equipment as of March 31, 2012 and December 31, 2011 are summarized in the table below:


	March 31, 2012		December 31, 2011
(Dollars in millions)
Land	$	6.7	$	6.6
Buildings		35.1		34.7
Machinery and equipment		599.3		593.5

		641.1		634.8
Less accumulated depreciation		487.4		479.2

Net	$	153.7	$	155.6

11. Property, Plant and Equipment

Property, plant and equipment as of December 31, 2011 and 2010 were as follows:


	December 31,
	2011		2010
(Dollars in millions)
Land	$	6.6	$	7.6
Buildings		34.7		36.5
Machinery and equipment		593.5		605.5

		634.8		649.6
Less accumulated depreciation		479.2		481.4

Net	$	155.6	$	168.2

Depreciation expense for the years ended December 31, 2011, 2010 and 2009 amounted to $46.0 million, $25.6 million and $22.8 million, respectively. Included in depreciation expense for 2011 and 2010 were impairment charges totaling $20.2 million and $1.8 million, respectively. The charge in 2011 related to the Carbon Material & Chemicals segment’s carbon black facility in Australia and the charge in 2010 related to a Railroad and Utility Products segment’s wood treating plant in the United States.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Pensions and Postretirement Benefit Plans

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Pensions and Postretirement Benefit Plans [Abstract]

Pensions and Postretirement Benefit Plans

12. Pensions and Postretirement Benefit Plans

The Company and its subsidiaries maintain a number of defined benefit and defined contribution plans to provide retirement benefits for employees in the U.S., as well as employees outside the U.S. These plans are maintained and contributions are made in accordance with the Employee Retirement Income Security Act of 1974 (“ERISA”), local statutory law or as determined by the board of directors. The defined benefit pension plans generally provide benefits based upon years of service and compensation. Pension plans are funded except for three domestic non-qualified defined benefit pension plans for certain key executives.

All qualified defined benefit pension plans for salaried employees have been closed to new participants and a number of plans, including some plans for hourly employees, have been frozen. Accordingly, these pension plans no longer accrue additional years of service or recognize future increases in compensation for benefit purposes. In addition, a number of pension plans are subject to a “soft” freeze which precludes new employees from entering the defined benefit pension plans.

The defined contribution plans generally provide retirement assets to employee participants based upon employer and employee contributions to the participant’s individual investment account. The Company also provides retiree medical insurance coverage to certain U.S. employees and a life insurance benefit to most U.S. employees. For salaried employees, the retiree medical and retiree insurance plans have been closed to new participants.

The following table provides the components of net periodic benefit cost for the pension plans and other benefit plans for the three months ended March 31, 2012 and 2011:


	Three Months Ended March 31,
	2012			2011
(Dollars in millions)
Service cost	$	0.9		$	0.8
Interest cost		2.8			2.9
Expected return on plan assets		(2.7	)		(2.8	)
Amortization of net loss		2.0			1.6
Amortization of transition asset		(0.1	)		(0.1	)

Net periodic benefit cost for defined benefit plans	$	2.9		$	2.4

Defined contribution plan expense	$	1.5		$	1.5
Other postretirement benefit plan expense		0.2			0.2
Multi-employer pension plan expense		0.2			0.2

15. Pensions and Post-retirement Benefit Plans

Expense related to defined contribution plans totaled $4.8 million, $4.7 million and $2.5 million for the years ended December 31, 2011, 2010 and 2009, respectively. Expense related to contributions to multi-employer pension plans totaled $0.7 million for both of the years ended December 31, 2011 and 2010.

Net periodic pension costs for 2011, 2010 and 2009 were as follows:


	December 31,
	Pension Benefits									Other Benefits
	2011			2010			2009			2011			2010			2009
(Dollars in millions)
Components of net periodic benefit cost:
Service cost	$	3.3		$	3.1		$	2.8		$	0.2		$	0.2		$	0.2
Interest cost		11.1			11.4			10.8			0.6			0.7			0.8
Expected return on plan assets		(11.0	)		(9.9	)		(8.5	)		0.0			0.0			0.0
Amortization of prior service cost		0.1			0.2			0.2			(0.1	)		(0.1	)		(0.3	)
Amortization of net loss		6.3			5.2			6.3			0.0			0.0			0.0
Amortization of transition asset		(0.3	)		(0.3	)		(0.3	)		0.0			0.0			0.0
Settlements and curtailments		0.2			0.5			0.0			0.0			0.0			0.0

Net periodic benefit cost	$	9.7		$	10.2		$	11.3		$	0.7		$	0.8		$	0.7

Net periodic pension cost (benefit) that is expected to be recognized from the amortization of prior service cost, net loss and transition asset is estimated to total $0.1 million, $8.1 million and $(0.3) million, respectively, for all plans in 2012.

The change in the funded status of the pension and postretirement plans as of December 31, 2011 and December 31, 2010 is as follows:


	December 31,
	Pension Benefits						Other Benefits
	2011			2010			2011			2010
(Dollars in millions)
Change in benefit obligation:
Benefit obligation at beginning of year	$	215.9		$	201.9		$	12.8		$	13.6
Service cost		3.3			3.1			0.1			0.2
Interest cost		11.2			11.4			0.6			0.7
Plan participants’ contributions		0.2			0.2			0.0			0.0
Actuarial losses (gains)		20.2			12.9			(0.5	)		(0.5	)
Settlements		(0.8	)		(2.4	)		0.0			0.0
Curtailments		0.0			(1.1	)		0.0			0.0
Currency translation		(0.3	)		(0.7	)		0.0			0.0
Benefits paid		(10.2	)		(9.4	)		(0.5	)		(1.2	)

Benefit obligation at end of year		239.5			215.9			12.5			12.8

Change in plan assets:
Fair value of plan assets at beginning of year		141.6			132.8			0.0			0.0
Actual return on plan assets		0.1			14.3			0.0			0.0
Employer contribution		15.9			6.3			0.5			1.2
Plan participants’ contributions		0.2			0.2			0.0			0.0
Settlements		(0.8	)		(2.4	)		0.0			0.0
Currency translation		(0.2	)		(0.2	)		0.0			0.0
Benefits paid		(10.2	)		(9.4	)		(0.5	)		(1.2	)

Fair value of plan assets at end of year		146.6			141.6			0.0			0.0

Funded status of the plan	$	(92.9	)	$	(74.3	)	$	(12.5	)	$	(12.8	)


Amounts recognized in the balance sheet consist of:
Noncurrent assets	$	0.3		$	0.9		$	0.0		$	0.0
Current liabilities		0.7			0.6			1.0			1.3
Noncurrent liabilities		92.5			74.6			11.5			11.5

Pension plans with benefit obligations in excess of plan assets:
Benefit obligation	$	231.5		$	208.1
Fair value of plan assets		138.3			132.9

Pension plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	$	224.1		$	201.6
Fair value of plan assets		138.3			132.9

The measurement date for the U.S., Australian and United Kingdom pension and postretirement assets and obligations is December 31 for each respective year.

The accumulated benefit obligation for all defined benefit pension plans as of December 31, 2011 and 2010 was $231.5 million and $209.4 million, respectively.

Expected Contributions for the 2012 Fiscal Year

The expected contributions by the Company for 2012 are estimated to be $12.9 million for pension plans and $1.0 million for other benefit plans.

Projected Benefit Payments

Benefit payments for pension benefits, which are primarily funded by the pension plan assets, and other benefits, which are funded by general corporate assets and reflecting future expected service as appropriate, are expected to be paid as follows:


	Pension Benefits		Other Benefits
(Dollars in millions)
2012	$	12.1	$	1.0
2013		10.8		0.9
2014		11.6		0.9
2015		11.9		0.9
2016		13.1		0.9
2017 – 2021		72.0		4.6

Weighted-Average Assumptions as of December 31


	December 31,
	Pension Benefits						Other Benefits
	2011			2010			2011			2010
Discount rate		4.55	%		5.28	%		4.37	%		5.09	%
Expected return on plan assets		7.68			7.65
Rate of compensation increase		3.09			3.10
Initial medical trend rate								7.80			8.00

Basis for the Selection of the Long-Term Rate of Return on Assets

The long-term rate of return on assets assumption was determined by using the plan’s asset allocation as described in the plan’s investment policy and modeling a distribution of compound average returns over a 20-year time horizon. The model uses asset class return, variance, and correlation assumptions to produce the expected return. The return assumptions used forward looking gross returns influenced by the current bond yields, corporate bond spreads and equity risk premiums based on current market conditions.

In general, the long-term rate of return is the sum of the portion of total assets in each asset class multiplied by the expected return for that class, adjusted for expected expenses to be paid from the assets. To develop the expected long-term rate of return on assets assumption, the Company considered the historical returns and the future expectations for returns for each asset class, as well as the target asset allocation of the pension portfolio. This resulted in the selection of the 7.68 percent long-term rate of return on assets assumption.

Investment Strategy

The weighted average asset allocation for the Company’s pension plans at December 31 by asset category is as follows:


	December 31,
	2011			2010
Equity securities		64	%		67	%
Debt securities		30			27
Other		6			6

		100	%		100	%

The Company’s investment strategy for its pension plans is to maintain an adequate level of diversification, to reduce interest rate and market risk and to provide adequate liquidity to meet immediate and future benefit payment requirements. The Company’s overall investment strategy is to achieve a mix of growth seeking assets, principally U.S. and international public company equity securities and income generating assets, principally debt securities, real estate and cash. Currently, the Company targets an allocation of 50 percent to 75 percent growth seeking assets and 25 percent to 50 percent income generating assets. The Company utilizes investment managers to assist in identifying and monitoring investments that meet these allocation criteria.

The investment valuation policy of the Company is to value investments at fair value. Most of the assets are invested in pooled or commingled investment vehicles. The Company’s interest in these investment vehicles is expressed as a unit of account with a value per unit that is the result of the accumulated values of the underlying investments. Equity securities held within these investment vehicles are typically priced on a daily basis using the closing market price from the exchange the security is traded. Debt securities held within these investment vehicles are typically priced on a daily basis by independent pricing services. The fair value of real estate investments are either priced through a listing on an exchange or are subject to periodic appraisals.

The pension assets are all substantially held in pooled or commingled investment vehicles. The following table sets forth by level, the Company’s pension plan assets at fair value, within the fair value hierarchy, as of December 31, 2011 and December 31, 2010:


	As of December 31, 2011
	Quoted prices in active markets for identical assets (Level 1)		Significant observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
(Dollars in millions)
U.S. equity securities	$	0.0	$	71.8	$	0.0	$	71.8
International equity securities		0.0		22.6		0.0		22.6
U.S. debt securities		0.0		22.0		0.0		22.0
International debt securities		0.0		22.4		0.0		22.4
Real estate and other investments		0.0		1.6		0.0		1.6
Cash and cash equivalents		0.0		6.2		0.0		6.2

	$	0.0	$	146.6	$	0.0	$	146.6


	As of December 31, 2010
	Quoted prices in active markets for identical assets (Level 1)		Significant observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
(Dollars in millions)
U.S. equity securities	$	0.0	$	70.3	$	0.0	$	70.3
International equity securities		0.0		25.3		0.0		25.3
U.S. debt securities		0.0		18.5		0.0		18.5
International debt securities		0.0		19.3		0.0		19.3
Real estate and other investments		0.0		1.6		0.0		1.6
Cash and cash equivalents		0.0		6.6		0.0		6.6

	$	0.0	$	141.6	$	0.0	$	141.6

Health Care Cost Trend Rates

The 2011 initial health care cost trend rate is assumed to be eight percent and is assumed to decrease gradually to 4.5 percent in 2027 and remain at that level thereafter. The assumed health care cost trend rate has a significant effect on the amounts reported for other postretirement benefit liability. A one-percentage-point change in the assumed health care cost trend rate would have the following effects:


	1% Increase		1% Decrease
(Dollars in millions)
Increase (decrease) from change in health care cost trend rates:
Postretirement benefit expense	$	0.0	$	0.0
Postretirement benefit liability		0.3		(0.3	)

Incentive Plan

The Company has short-term management incentive plans that pay cash bonuses if certain Company performance and individual goals are met. The charge to operating expense for these plans was $5.6 million in 2011, $5.0 million in 2010 and $4.5 million in 2009.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Debt

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Debt [Abstract]

Debt

13. Debt

Debt at March 31, 2012 and December 31, 2011 was as follows:


	Weighted Average Interest Rate			Maturity		March 31, 2012		December 31, 2011
(Dollars in millions)
Revolving Credit Facility		3.41	%		2015	$	18.5	$	6.4
Senior Notes		7⁷/8	%		2019		295.8		295.7

Total debt							314.3		302.1
Less short term debt and current maturities of long-term debt							0.0		0.0

Long-term debt						$	314.3	$	302.1

Revolving Credit Facility

The Koppers Inc. revolving credit facility agreement provides for a revolving credit facility of up to $300.0 million at variable rates. Borrowings under the revolving credit facility are secured by a first priority lien on substantially all of the assets of Koppers Inc. and its material domestic subsidiaries. The revolving credit facility contains certain covenants for Koppers Inc. and its restricted subsidiaries that limit capital expenditures, additional indebtedness, liens, dividends, investments or acquisitions. In addition, such covenants give rise to events of default upon the failure by Koppers Inc. and its restricted subsidiaries to meet certain financial ratios. Commitment fees totaled $0.3 million for each of the three months ended March 31, 2012 and 2011 and are charged to interest expense.

As of March 31, 2012, the Company had $263.6 million of unused revolving credit availability for working capital purposes after restrictions from certain letter of credit commitments and other covenants. As of March 31, 2012, $9.9 million of commitments were utilized by outstanding letters of credit.

Senior Notes

The Koppers Inc. 7 ⁷/8 percent Senior Notes due 2019 (the “Senior Notes”) were issued on December 1, 2009 at an offering price of 98.311 percent of face value, or $294.9 million and have a principal amount at maturity of $300.0 million. The Senior Notes have an effective interest rate yield of 8 ¹/8 percent per annum. The Senior Notes are unsecured senior obligations that are fully and unconditionally guaranteed by Koppers Holdings and certain of Koppers Inc.’s wholly-owned domestic subsidiaries. The Senior Notes are structurally subordinated to indebtedness under the revolving credit facility.

Interest on the Senior Notes is payable semiannually on December 1 and June 1 each year. On or after December 1, 2014, the Company is entitled to redeem all or a portion of the Senior Notes at a redemption price of 103.938 percent of principal value, declining annually in ratable amounts until the redemption price is equivalent to the principal value on December 1, 2017.

The indenture governing the Senior Notes includes customary covenants that restrict, among other things, the ability of Koppers Inc. and its restricted subsidiaries to incur additional debt, pay dividends or make certain other restricted payments, incur liens, merge or sell all or substantially all of the assets of Koppers Inc. or its subsidiaries or enter into various transactions with affiliates.

13. Debt

Debt at December 31, 2011 and December 31, 2010 was as follows:


						December 31,
	Weighted Average Interest Rate			Maturity		2011		2010
(Dollars in millions, except interest rates)
Revolving Credit Facility		2.55	%		2015	$	6.4	$	0.0
Senior Notes		7⁷/8	%		2019		295.7		295.3
Other debt, including capital leases		0.0	%				0.0		1.1

Total debt							302.1		296.4
Less short-term debt and current maturities of long-term debt							0.0		1.0

Long-term debt (excluding current portion)						$	302.1	$	295.4

Revolving Credit Facility

The Koppers Inc. revolving credit facility agreement provides for a revolving credit facility of up to $300.0 million at variable rates. Borrowings under the revolving credit facility are secured by a first priority lien on substantially all of the assets of Koppers Inc. and its material domestic subsidiaries. The revolving credit facility contains certain covenants for Koppers Inc. and its restricted subsidiaries that limit capital expenditures, additional indebtedness, liens, dividends, investments or acquisitions. In addition, such covenants give rise to events of default upon the failure by Koppers Inc. and its restricted subsidiaries to meet certain financial ratios. Commitment fees totaled $1.1 million in 2011, $1.3 million in 2010 and $1.8 million in 2009 and are charged to interest expense.

As of December 31, 2011, the Company had $275.8 million of unused revolving credit availability for working capital purposes after restrictions from certain letter of credit commitments and other covenants. As of December 31, 2011, $14.2 million of commitments were utilized by outstanding letters of credit.

Senior Notes

The Koppers Inc. 7 ⁷/8 percent Senior Notes due 2019 (the “Senior Notes”) were issued on December 1, 2009 at an offering price of 98.311 percent of face value, or $294.9 million and have a principal amount at maturity of $300.0 million. The Senior Notes have an effective interest rate yield of 8¹/8 percent per annum. The Senior Notes are unsecured senior obligations that are fully and unconditionally guaranteed by Koppers Holdings and certain of Koppers Inc.’s wholly-owned domestic subsidiaries. The Senior Notes are structurally subordinated to indebtedness under the revolving credit facility.

Loss on Extinguishment of Debt

All of the outstanding Koppers Inc. 9⁷/8 percent Senior Secured Notes due 2013 (the “Senior Secured Notes”) were redeemed on October 15, 2009. The Senior Secured Notes were guaranteed, jointly and severally, on a senior secured basis by certain of the Company’s subsidiaries. The Senior Secured Notes were redeemed at a premium to principal value and accordingly, the Company realized a loss on extinguishment of debt totaling $9.2 million consisting of $6.1 million for bond premium and $3.1 million for the write-off of deferred financing costs in 2009.

The Company had a notional $50.0 million interest rate swap to convert a portion of the Senior Secured Notes from fixed-interest rate debt to floating-interest rate debt. On October 15, 2009 and concurrent with the redemption of the Senior Secured Notes, the swap was terminated which resulted in a gain of $1.6 million which was recorded in interest expense.

All of the outstanding Koppers Holdings’ 9⁷/8 percent Senior Discount Notes due 2014 (the “Senior Discount Notes”) were redeemed in December 2009 through a tender offer and call. The Senior Discount Notes had a principal amount $203.0 million. The Senior Discount Notes were redeemed at a premium to principal value and accordingly, the Company in 2009 realized a loss on extinguishment of debt totaling $13.2 million consisting of $10.0 million for bond premium, $2.6 million for the write-off of deferred financing costs and $0.6 million for bond tender expenses.

Debt Maturities and Deferred Financing Costs

At December 31, 2011 the aggregate debt maturities for the next five years are as follows:



(Dollars in millions)
2012	$	0.0
2013		0.0
2014		0.0
2015		6.4
2016		0.0
Thereafter		300.0

Total maturities		306.4
Future accretion on Senior Notes		(4.3	)

Total debt	$	302.1

Unamortized deferred financing costs (net of accumulated amortization of $3.4 million and $2.1 million at December 31, 2011 and 2010, respectively) were $8.3 million and $9.1 million at December 31, 2011 and 2010, respectively, and are included in other assets.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Asset Retirement Obligations

3 Months Ended

Mar. 31, 2012

Asset Retirement Obligations [Abstract]

Asset Retirement Obligations

14. Asset Retirement Obligations

The Company recognizes asset retirement obligations for the removal and disposal of residues; dismantling of certain tanks required by governmental authorities; cleaning and dismantling costs for owned rail cars; and cleaning costs for leased rail cars and barges. The following table reflects changes in the carrying values of asset retirement obligations:


	March 31, 2012			December 31, 2011
(Dollars in millions)
Balance at beginning of year	$	21.3		$	17.0
Accretion expense		0.2			1.1
Revision in estimated cash flows, net		0.1			6.3
Expenses incurred		(0.4	)		(3.1	)
Currency translation		0.2			0.0

Balance at end of period	$	21.4		$	21.3

Deferred Revenue from Extended Product Warranty Liabilities

3 Months Ended

Mar. 31, 2012

Deferred Revenue from Extended Product Warranty Liabilities [Abstract]

Deferred Revenue from Extended Product Warranty Liabilities

15. Deferred Revenue from Extended Product Warranty Liabilities

The Company defers revenues associated with extended product warranty liabilities based on historical loss experience and sales of extended warranties on certain products. The following table reflects changes in the carrying values of deferred revenue:


	March 31, 2012			December 31, 2011
(Dollars in millions)
Balance at beginning of year	$	4.8		$	5.7
Revenue earned		(0.2	)		(0.9	)

Balance at end of period	$	4.6		$	4.8

Commitments and Contingent Liabilities

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Commitments and Contingent Liabilities [Abstract]

Commitments and Contingent Liabilities

16. Commitments and Contingent Liabilities

The Company and its subsidiaries are involved in litigation and various proceedings relating to environmental laws and regulations and toxic tort, product liability and other matters. Certain of these matters are discussed below. The ultimate resolution of these contingencies is subject to significant uncertainty and should the Company or its subsidiaries fail to prevail in any of these legal matters or should several of these legal matters be resolved against the Company or its subsidiaries in the same reporting period, these legal matters could, individually or in the aggregate, be material to the consolidated financial statements.

Legal Proceedings

Coal Tar Pitch Cases. Koppers Inc., along with other defendants, is currently a defendant in lawsuits filed in four states in which the plaintiffs claim they suffered a variety of illnesses (including cancer) as a result of exposure to coal tar pitch sold by the defendants. There are approximately 131 plaintiffs in 74 cases pending as of March 31, 2012 as compared to 131 plaintiffs in 73 cases at December 31, 2011. As of March 31, 2012, there are a total of 67 cases pending in state court in Pennsylvania, four in Arkansas, and one case each pending in state courts in Tennessee, Indiana and Illinois.

The plaintiffs in all 74 pending cases seek to recover compensatory damages, while plaintiffs in 65 cases also seek to recover punitive damages. The plaintiffs in the 67 cases filed in Pennsylvania state court seek unspecified damages in excess of the court’s minimum jurisdictional limit. The plaintiffs in the Arkansas state court cases each seek compensatory damages in excess of $50,000 in addition to punitive damages. The plaintiffs in the case filed in Indiana state court also seek damages in an unspecified amount. The plaintiffs in the Tennessee state court case each seek damages of $15.0 million. The plaintiff in the Illinois state court case seeks compensatory damages in excess of $50,000.

The other defendants in these lawsuits vary from case to case and include companies such as Beazer East, Inc., United States Steel Corporation, Honeywell International Inc., Vertellus Specialties Inc., Dow Chemical Company, Rust-Oleum Corporation, UCAR Carbon Company, Inc., Exxon Mobil Corporation, Chemtura Corporation, SGL Carbon Corporation, Alcoa, Inc., and PPG Industries, Inc. Discovery is proceeding in these cases. No trial dates have been set in any of these cases.

The Company has not provided a reserve for these lawsuits because, at this time, the Company cannot reasonably determine the probability of a loss, and the amount of loss, if any, cannot be reasonably estimated. The timing of resolution of these cases cannot be reasonably determined. Although Koppers Inc. is vigorously defending these cases, an unfavorable resolution of these matters may have a material adverse effect on the Company’s business, financial condition, cash flows and results of operations.

Gainesville. Koppers Inc. operated a utility pole treatment plant in Gainesville from December 29, 1988 until its closure late in 2009. The property upon which the utility pole treatment plant was located was sold by Koppers Inc. to Beazer East, Inc. in the first quarter of 2010.

The case was removed to the United States District Court for the Northern District of Florida in December 2010. Koppers Holdings Inc. filed a motion to dismiss alleging that the Court lacks personal jurisdiction over it. The Court has not yet ruled on Koppers Holdings Inc.’s motion to dismiss. The plaintiffs were granted leave to file a supplemental amended complaint which expands the boundaries of the “class affected area” from its original size. The Court recently granted the parties joint motion to stay the proceedings for 120 days so that the parties can explore the possibility of resolving the case. The Court has not yet scheduled a class certification hearing or trial.

The Company has not provided a reserve for this matter because, at this time, it cannot reasonably determine the probability of a loss, and the amount of loss, if any, cannot be reasonably estimated. The timing of resolution of this case cannot be reasonably determined. Although the Company is vigorously defending this case, an unfavorable resolution of this matter may have a material adverse effect on the Company’s business, financial condition, cash flows and results of operations.

Environmental and Other Litigation Matters

The Company and its subsidiaries are subject to federal, state, local and foreign laws and regulations and potential liabilities relating to the protection of the environment and human health and safety including, among other things, the cleanup of contaminated sites, the treatment, storage and disposal of wastes, the discharge of effluent into waterways, the emission of substances into the air and various health and safety matters. The Company’s subsidiaries expect to incur substantial costs for ongoing compliance with such laws and regulations. The Company’s subsidiaries may also face governmental or third-party claims, or otherwise incur costs, relating to cleanup of, or for injuries resulting from, contamination at sites associated with past and present operations. The Company accrues for environmental liabilities when a determination can be made that a liability is probable and reasonably estimable.

Environmental and Other Liabilities Retained or Assumed by Others. The Company’s subsidiaries have agreements with former owners of certain of their operating locations under which the former owners retained, assumed and/or agreed to indemnify such subsidiaries against certain environmental and other liabilities. The most significant of these agreements was entered into at Koppers Inc.’s formation on December 29, 1988 (the “Acquisition”). Under the related asset purchase agreement between Koppers Inc. and Beazer East, subject to certain limitations, Beazer East retained the responsibility for and agreed to indemnify Koppers Inc. against certain liabilities, damages, losses and costs, including, with certain limited exceptions, liabilities under and costs to comply with environmental laws to the extent attributable to acts or omissions occurring prior to the Acquisition and liabilities related to products sold by Beazer East prior to the Acquisition (the “Indemnity”). Beazer Limited, the parent company of Beazer East, unconditionally guaranteed Beazer East’s performance of the Indemnity pursuant to a guarantee (the “Guarantee”). In 1998, the parent company of Beazer East purchased an insurance policy under which the funding and risk of certain environmental and other liabilities relating to the former Koppers Company, Inc. operations of Beazer East (which includes locations purchased from Beazer East by Koppers Inc.) are underwritten by Centre Solutions (a member of the Zurich Group) and Swiss Re. Beazer East is a wholly-owned, indirect subsidiary of Heidelberg Cement AG.

The Indemnity provides different mechanisms, subject to certain limitations, by which Beazer East is obligated to indemnify Koppers Inc. with regard to certain environmental, product and other liabilities and imposes certain conditions on Koppers Inc. before receiving such indemnification, including, in some cases, certain limitations regarding the time period as to which claims for indemnification can be brought. In July 2004, Koppers Inc. and Beazer East agreed to amend the environmental indemnification provisions of the December 29, 1988 asset purchase agreement to extend the indemnification period for pre-closing environmental liabilities through July 2019. As consideration for the amendment, Koppers Inc. paid Beazer East a total of $7.0 million and agreed to share toxic tort litigation defense costs arising from any sites acquired from Beazer East. The July 2004 amendment did not change the provisions of the Indemnity with respect to indemnification for non-environmental claims, such as product liability claims, which claims may continue to be asserted after July 2019.

Qualified expenditures under the Indemnity are not subject to a monetary limit. Qualified expenditures under the Indemnity include (i) environmental cleanup liabilities required by third parties, such as investigation, remediation and closure costs, relating to pre-December 29, 1988, or Pre-Closing, acts or omissions of Beazer East or its predecessors; (ii) environmental claims by third parties for personal injuries, property damages and natural resources damages relating to Pre-Closing acts or omissions of Beazer East or its predecessors; (iii) punitive damages for the acts or omissions of Beazer East and its predecessors without regard to the date of the alleged conduct and (iv) product liability claims for products sold by Beazer East or its predecessors without regard to the date of the alleged conduct. If the third party claims described in sections (i) and (ii) above are not made by July 2019, Beazer East will not be required to pay the costs arising from such claims under the Indemnity. However, with respect to any such claims which are made by July 2019, Beazer East will continue to be responsible for such claims under the Indemnity beyond July 2019. The Indemnity provides for the resolution of issues between Koppers Inc. and Beazer East by an arbitrator on an expedited basis upon the request of either party. The arbitrator could be asked, among other things, to make a determination regarding the allocation of environmental responsibilities between Koppers Inc. and Beazer East. Arbitration decisions under the Indemnity are final and binding on the parties.

Contamination has been identified at most manufacturing and other sites of the Company’s subsidiaries. Two sites currently owned and operated by Koppers Inc. in the United States are listed on the National Priorities List promulgated under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (“CERCLA”). Currently, at the properties acquired from Beazer East (which include all of the National Priorities List sites and all but one of the sites permitted under the Resource Conservation and Recovery Act (“RCRA”)), a significant portion of all investigative, cleanup and closure activities are being conducted and paid for by Beazer East pursuant to the terms of the Indemnity. In addition, other of Koppers Inc.’s sites are or have been operated under RCRA and various other environmental permits, and remedial and closure activities are being conducted at some of these sites.

To date, the parties that retained, assumed and/or agreed to indemnify the Company against the liabilities referred to above, including Beazer East, have performed their obligations in all material respects. The Company believes that, for the last three years ended December 31, 2011, amounts paid by Beazer East as a result of its environmental remediation obligations under the Indemnity have averaged in total approximately $15 million per year. Periodically, issues have arisen between Koppers Inc. and Beazer East and/or other indemnitors that have been resolved without arbitration. Koppers Inc. and Beazer East engage in discussions from time to time that involve, among other things, the allocation of environmental costs related to certain operating and closed facilities.

If for any reason (including disputed coverage or financial incapability) one or more of such parties fail to perform their obligations and the Company or its subsidiaries are held liable for or otherwise required to pay all or part of such liabilities without reimbursement, the imposition of such liabilities on the Company or its subsidiaries could have a material adverse effect on its business, financial condition, cash flows and results of operations. Furthermore, the Company could be required to record a contingent liability on its balance sheet with respect to such matters, which could result in a negative impact to the Company’s business, financial condition, cash flows and results of operations.

Domestic Environmental Matters. Koppers Inc. has been named as a potentially responsible party (a “PRP”) at the Portland Harbor CERCLA site located on the Willamette River in Oregon. Koppers Inc. has replied to an EPA Information request and has executed a PRP agreement which outlines the process to develop an allocation of past and future costs. The current estimate for past costs incurred in the remedial investigation/feasibility study is approximately $100 million. Koppers Inc. currently operates a coal tar pitch terminal near the site. Koppers Inc. has accrued its estimated cost of participation in the PRP group. Separate from the EPA activities, a natural resources damages assessment is being conducted by a local trustee group. In September 2009, Koppers Inc. received a general notice letter notifying it that it may be a PRP at the Newark Bay CERCLA site. In January 2010, Koppers Inc. submitted a response to the general notice letter asserting that Koppers Inc. is a de minimus party at this site. Other than the estimated costs of participating in the PRP group at the Portland Harbor and Newark Bay CERCLA sites totaling $0.6 million at March 31, 2012, the Company has not provided a reserve for these matters because, at this time, it cannot reasonably determine the probability of a loss, and the amount of loss, if any, cannot be reasonably estimated. An unfavorable resolution of these matters may have a material adverse effect on the Company’s business, financial condition, cash flows and results of operations.

At the request of the Illinois Environmental Protection Agency, Koppers Inc. conducted a voluntary investigation of soil and groundwater at its Stickney, Illinois carbon materials and chemicals facility. Koppers Inc. also conducted an investigation of soil and groundwater at a leased terminal site located adjacent to the Stickney facility. Koppers Inc. is conducting such investigations in cooperation with Beazer East. The Company’s reserve for this matter was $0.3 million as of March 31, 2012.

Australian Environmental Matters. Soil and groundwater contamination has been detected at certain of the Company’s Australian facilities. At the Company’s tar distillation facility in Newcastle, New South Wales, Australia, soil contamination from an abandoned underground coal tar pipeline and other groundwater contamination have been detected at a property adjacent to the facility. In 2011, the Company and the owner of the adjacent property reached an agreement in which the Company will contribute $1.6 million and the owner of the adjacent property will contribute $7.5 million toward remediation of the property. The agreement provides that the Company will assume responsibility for the management of the remediation effort and will indemnify the current owner for any remediation costs in excess of its agreed contribution. At the completion of the remediation, the agreement provides that the property will be transferred to the Company. The remediation project commenced in the fourth quarter of 2011 and the Company has reserved its expected remaining remediation costs of $6.0 million and has recorded a receivable, net of cash collections, from the owner of the adjacent property of $4.2 million as of March 31, 2012.

In December 2011, the Company ceased manufacturing operations at its Continental Carbon facility located in Kurnell, Australia. This decision was made as a result of deteriorating business conditions including raw material availability and cost, competition in the export markets due to the strength of the Australian dollar and a variety of other factors. The Company has accrued its expected cost of site remediation resulting from the closure of $6.9 million as of March 31, 2012.

Other Australian environmental matters include soil and groundwater remediation at a number of current and former facilities in Australia. The Company has reserved $1.3 million for remediation costs at the remaining Australian sites.

Other Matters. On February 18, 2012, approximately 400 tons of liquid carbon pitch leaked from a storage tank at the Company’s terminal facility in Portland, Victoria, Australia. All of the coal tar pitch was contained within the tank farm area and no release of material to water or soil occurred. Costs directly associated with the leak totaled $1.7 million for the three months ended March 31, 2012 and primarily consisted of inventory losses of $0.4 million, emergency response expenses of $0.5 million, incremental logistics expenses of $0.4 million and estimated material clean-up and removal expenses of $0.4 million. The Company has also received two claims for damages totaling less than $1.0 million from entities who allege that their businesses were adversely affected during the temporary closure of Portland’s harbor. The Company has not provided a reserve for these claims because, at this time, it cannot reasonably determine the probability of a loss, and the amount of the loss, if any, cannot be reasonably estimated.

Environmental Reserves Rollforward. The following table reflects changes in the accrued liability for environmental matters, of which $6.5 million and $8.1 million are classified as current liabilities at March 31, 2012 and December 31, 2011, respectively:


	Period ended
	March 31, 2012			December 31, 2011
(Dollars in millions)
Balance at beginning of year	$	17.7		$	6.6
Expense		0.6			8.0
Reversal of reserves		(0.1	)		(1.6	)
Cash expenditures		(2.3	)		(2.4	)
Assumed remediation liability in exchange for cash		0.0			7.5
Currency translation		0.3			(0.4	)

Balance at end of year	$	16.2		$	17.7

18. Commitments and Contingent Liabilities

Legal Proceedings

Coal Tar Pitch Cases. Koppers Inc., along with other defendants, is currently a defendant in lawsuits filed in four states in which the plaintiffs claim they suffered a variety of illnesses (including cancer) as a result of exposure to coal tar pitch sold by the defendants. There are approximately 131 plaintiffs in 73 cases pending as of December 31, 2011 as compared to 111 plaintiffs in 62 cases at December 31, 2010. As of December 31, 2011, there are a total of 66 cases pending in state court in Pennsylvania, four in Arkansas, and one case each pending in state courts in Tennessee, Indiana and Illinois.

The plaintiffs in all 73 pending cases seek to recover compensatory damages, while plaintiffs in 64 cases also seek to recover punitive damages. The plaintiffs in the 66 cases filed in Pennsylvania state court seek unspecified damages in excess of the court’s minimum jurisdictional limit. The plaintiffs in the Arkansas state court cases each seek compensatory damages in excess of $50,000 in addition to punitive damages. The plaintiffs in the case filed in Indiana state court also seek damages in an unspecified amount. The plaintiffs in the Tennessee state court case each seek damages of $15.0 million. The plaintiff in the Illinois state court case seeks compensatory damages in excess of $50,000.

Somerville Cases. Koppers Inc. has been defending a set of state court cases in Tarrant County and Burleson County, Texas. These cases involved plaintiffs who alleged that they suffered personal injuries resulting from exposure to wood preservative chemicals used at the Somerville, Texas wood treatment plant.

During the fourth quarter of 2011, three sets of state court cases were closed in Burleson County as motions to dismiss were granted by the courts and the Company considers it unlikely that these claims will be re-filed by the plaintiffs. In addition, during the first quarter of 2012, all remaining cases against Koppers Inc. in Tarrant County were dismissed by the plaintiffs. The Company considers it unlikely that these cases will be re-filed by the plaintiffs.

Grenada. Koppers Inc., together with various co-defendants (including Beazer East), was named as a defendant in toxic tort lawsuits in federal court in Mississippi and in state court in Mississippi arising from the operation of the Grenada facility. The complaints alleged that plaintiffs were exposed to harmful levels of various toxic chemicals, including creosote, pentachlorophenol, polycyclic aromatic hydrocarbons and dioxin, as a result of soil, surface water and groundwater contamination and air emissions from the Grenada facility.

Counsel for the plaintiffs in the Grenada state and federal cases and counsel for the Company and Beazer East engaged in mediation in December 2010. As a result of the mediation, a settlement agreement was reached with respect to all outstanding state and federal cases, except for one case pending in state court. The terms of the settlement agreement provide that the pending cases will either be dismissed or, with respect to certain specified cases, plaintiffs’ attorney may withdraw as counsel in lieu of dismissal. As a result of this agreement, the Company included a charge with respect to the state and federal litigation in its financial statements for the year ended December 31, 2010 of $3.0 million. In August 2011, the settlement payment was made by Koppers Inc. As of January 2012, all claims have been dismissed by the courts and all cases are closed.

Gainesville. Koppers Inc. operated a utility pole treatment plant in Gainesville from December 29, 1988 until its closure late in 2009. The property upon which the utility pole treatment plant was located was sold by Koppers Inc. to Beazer East, Inc. in the first quarter of 2010.

In November 2010, a class action complaint was filed in the Circuit Court of the Eighth Judicial Circuit located in Alachua County, Florida by residential real property owners located in a neighborhood west of and immediately adjacent to the former utility pole treatment plant in Gainesville. The complaint named Koppers Holdings Inc., Koppers Inc., Beazer East and several other parties as defendants. The complaint alleges that chemicals and dust from the plant have contaminated and impacted plaintiffs’ properties by reducing the fair market value. The complaint seeks injunctive relief and compensatory damages for diminution in property values and for plaintiffs’ loss of use and enjoyment of the properties. The case was removed to the United States District Court for the Northern District of Florida in December 2010. Koppers Holdings Inc. filed a motion to dismiss alleging that the Court lacks personal jurisdiction over it. The Court has not yet ruled on the Koppers Holdings Inc.’s motion to dismiss. Koppers Inc. also filed a motion to dismiss which was denied by the Court in February 2012. On February 16, 2012, plaintiffs filed a motion for leave to amend the complaint to, among other things, add three new plaintiffs, add twenty-six new defendants, and amend the definition of the putative class to include residential real properties in a larger geographic area surrounding the former Gainesville plant. The Court has not yet scheduled a class certification hearing or trial.

Legal Reserves Rollforward. The following table reflects changes in the accrued liability for legal proceedings:


	Year Ended December 31,
	2011			2010
(Dollars in millions)
Balance at beginning of year	$	3.0		$	0.0
Accrual of reserves		0.0			3.0
Cash expenditures		(3.0	)		0.0

Balance at end of year	$	0.0		$	3.0

Environmental and Other Litigation Matters

Environmental and Other Liabilities Retained or Assumed by Others. The Company’s subsidiaries have agreements with former owners of certain of their operating locations under which the former owners retained, assumed and/or agreed to indemnify such subsidiaries against certain environmental and other liabilities. The most significant of these agreements was entered into at Koppers Inc.’s formation on December 29, 1988 (the “Acquisition”). Under the related asset purchase agreement between Koppers Inc. and Beazer East, subject to certain limitations, Beazer East retained the responsibility for and agreed to indemnify Koppers Inc. against certain liabilities, damages, losses and costs, including, with certain limited exceptions, liabilities under and costs to comply with environmental laws to the extent attributable to acts or omissions occurring prior to the Acquisition and liabilities related to products sold by Beazer East prior to the Acquisition (the “Indemnity”). Beazer Limited, the parent company of Beazer East, unconditionally guaranteed Beazer East’s performance of the Indemnity pursuant to a guarantee (the “Guarantee”). In 1998, the parent company of Beazer East purchased an insurance policy under which the funding and risk of certain environmental and other liabilities relating to the former Koppers Company, Inc. operations of Beazer East (which includes locations purchased from Beazer East by Koppers Inc.) are underwritten by Centre Solutions (a member of the Zurich Group) and Swiss Re. Beazer East is a wholly-owned, indirect subsidiary of Heidelberg Cement AG.

If for any reason (including disputed coverage or financial incapability) one or more of such parties fail to perform their obligations and the Company or its subsidiaries are held liable for or otherwise required to pay all or part of such liabilities without reimbursement, the imposition of such liabilities on the Company or its subsidiaries could have a material adverse effect on its business, financial condition, cash flows and results of operations. Furthermore, the Company could be required to record a contingent liability on its balance sheet with respect to such matters, which could result in a negative adjustment to the Company’s business, financial condition, cash flows and results of operations.

Domestic Environmental Matters. Koppers Inc. has been named as a potentially responsible party (a “PRP”) at the Portland Harbor CERCLA site located on the Willamette River in Oregon. Koppers Inc. has replied to an EPA Information request and has executed a PRP agreement which outlines the process to develop an allocation of past and future costs. The current estimate for past costs incurred in the remedial investigation/feasibility study is approximately $100 million. Koppers Inc. currently operates a coal tar pitch terminal near the site. Koppers Inc. has accrued its estimated cost of participation in the PRP group. Separate from the EPA activities, a natural resources damages assessment is being conducted by a local trustee group. In September 2009, Koppers Inc. received a general notice letter notifying it that it may be a PRP at the Newark Bay CERCLA site. In January 2010, Koppers Inc. submitted a response to the general notice letter asserting that Koppers Inc. is a de minimus party at this site. Other than the estimated costs of participating in the PRP group at the Portland Harbor and Newark Bay CERCLA sites totaling $0.7 million at December 31, 2011, the Company has not provided a reserve for these matters because, at this time, it cannot reasonably determine the probability of a loss, and the amount of loss, if any, cannot be reasonably estimated. An unfavorable resolution of these matters may have a material adverse effect on the Company’s business, financial condition, cash flows and results of operations.

Australian Environmental Matters. Soil and groundwater contamination has been detected at certain of the Company’s Australian facilities. At the Company’s tar distillation facility in Newcastle, New South Wales, Australia, soil contamination from an abandoned underground coal tar pipeline and other groundwater contamination have been detected at a property adjacent to the facility. In 2011, the Company and the owner of the adjacent property reached an agreement in which the Company will contribute $1.6 million and the owner of the adjacent property will contribute $7.5 million toward remediation of the property. The agreement provides that the Company will assume responsibility for the management of the remediation effort and will indemnify the current owner for any remediation costs in excess of its agreed contribution. At the completion of the remediation, the agreement provides that the property will be transferred to the Company. The remediation project commenced in the fourth quarter of 2011 and the Company has reserved its expected remaining remediation costs of $8.0 million and has recorded a receivable, net of cash collections, from the owner of the adjacent property of $4.0 million as of December 31, 2011.

In December 2011, the Company ceased manufacturing operations at its Continental Carbon facility located in Kurnell, Australia. This decision was made as a result of deteriorating business conditions including raw material availability and cost, competition in the export markets due to the strength of the Australian dollar and a variety of other factors. The Company accrued its expected cost of site remediation resulting from the closure of $6.7 million in the fourth quarter of 2011.

Other Australian environmental matters include soil and groundwater remediation at a number of current and former facilities in Australia. With respect to a closed facility in Thornton, Australia, the sale of the property was completed in March 2010 and the buyer assumed all remediation liabilities. Accordingly, the accrual for remediation at this site was reduced in 2010 and resulted in a decrease to cost of sales of $2.9 million. The Company has reserved $1.3 million for remediation costs at the remaining Australian sites.

Environmental Reserves Rollforward. The following table reflects changes in the accrued liability for environmental matters, of which $8.1 million is classified as a current liability at December 31, 2011:


	Year Ended December 31,
	2011			2010
(Dollars in millions)
Balance at beginning of year	$	6.6		$	10.7
Expense		8.0			1.2
Reversal of reserves		(1.6	)		(4.3	)
Cash expenditures		(2.4	)		(1.5	)
Assumed remediation liability in exchange for cash		7.5			0.0
Currency translation		(0.4	)		0.5

Balance at end of year	$	17.7		$	6.6

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Subsidiary Guarantor Information for Koppers Inc. Senior Notes

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Subsidiary Guarantor Information for Koppers Inc. Senior Notes [Abstract]

Subsidiary Guarantor Information for Koppers Inc. Senior Notes

17. Subsidiary Guarantor Information for Koppers Inc. Senior Notes

On December 1, 2009, Koppers Inc. issued $300.0 million principal value of Senior Notes. Koppers Holdings and each of Koppers Inc.’s wholly-owned material domestic subsidiaries other than Koppers Assurance, Inc. fully and unconditionally guarantee the payment of principal and interest on the Senior Notes. The domestic guarantor subsidiaries include Koppers World-Wide Ventures Corporation, Koppers Delaware, Inc., Koppers Concrete Products, Inc., Concrete Partners, Inc., Koppers Ventures LLC and Koppers Asia LLC.

Separate condensed consolidating financial statement information for Koppers Holdings Inc. (the parent), Koppers Inc., the domestic guarantor subsidiaries and the non-guarantor subsidiaries as of March 31, 2012 and 2011 and for the three months ended March 31, 2012 and 2011 is as follows:

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	211.8		$	22.4	$	163.2	$	(16.5	)	$	380.9
Cost of sales including depreciation and amortization		0.0			189.4			16.3		143.0		(15.0	)		333.7
Selling, general and administrative		0.4			10.5			0.4		6.7		0.0			18.0

Operating profit (loss)		(0.4)			11.9			5.7		13.5		(1.5)			29.2
Other income (expense)		15.9			0.0			0.3		0.4		(15.9	)		0.7
Interest expense (income)		0.1			6.8			0.0		1.5		(1.5	)		6.9
Income taxes		(0.2	)		5.1			0.1		2.2		0.0			7.2

Income from continuing operations		15.6			0.0			5.9		10.2		(15.9	)		15.8
Discontinued operations		0.0			(0.1)			0.0		0.2		0.0			0.1
Noncontrolling interests		0.0			0.0			0.0		0.3		0.0			0.3

Net income attributable to Koppers	$	15.6		$	(0.1	)	$	5.9	$	10.1	$	(15.9	)	$	15.6

Comprehensive income attributable to Koppers	$	22.3		$	1.1		$	7.7	$	13.8	$	(22.6	)	$	22.3

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	189.2		$	18.9	$	145.1		$	(11.7	)	$	341.5
Cost of sales including depreciation and amortization		0.0			175.9			13.5		123.3			(10.2	)		302.5
Selling, general and administrative		0.3			9.6			0.5		7.3			0.0			17.7

Operating profit (loss)		(0.3	)		3.7			4.9		14.5			(1.5	)		21.3
Other income (expense)		9.0			0.0			0.0		0.0			(9.0	)		0.0
Interest expense (income)		(0.1	)		6.9			0.0		1.4			(1.3	)		6.9
Income taxes		(0.1	)		2.2			0.0		3.1			0.0			5.2

Income from continuing operations		8.9			(5.4	)		4.9		10.0			(9.2	)		9.2
Discontinued operations		0.0			0.1			0.0		(0.3	)		0.0			(0.2	)
Noncontrolling interests		0.0			0.0			0.0		0.1			0.0			0.1

Net income attributable to Koppers	$	8.9		$	(5.3	)	$	4.9	$	9.6		$	(9.2	)	$	8.9

Comprehensive income attributable to Koppers	$	16.6		$	(4.4	)	$	5.8	$	15.5		$	(16.9	)	$	16.6

Condensed Consolidating Balance Sheet

March 31, 2012


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	42.6	$	0.0		$	42.6
Accounts receivable, net		5.8		113.1			301.3			100.2		(328.0	)		192.4
Inventories, net		0.0		99.0			0.0			79.3		(0.1	)		178.2
Deferred tax assets		0.0		10.9			(1.5	)		0.2		0.0			9.6
Other current assets		0.0		7.2			0.3			24.4		0.0			31.9

Total current assets		5.8		230.2			300.1			246.7		(328.1	)		454.7
Equity investments		111.7		77.1			26.5			4.2		(214.1	)		5.4
Property, plant and equipment, net		0.0		100.3			0.0			53.4		0.0			153.7
Goodwill		0.0		39.8			0.0			33.2		0.0			73.0
Deferred tax assets		0.0		41.2			(10.5	)		10.8		0.0			41.5
Other noncurrent assets		0.0		17.7			126.9			44.0		(162.8	)		25.8

Total assets	$	117.5	$	506.3		$	443.0		$	392.3	$	(705.0	)	$	754.1

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	353.4		$	15.3		$	55.5	$	(327.7	)	$	96.6
Accrued liabilities		4.9		30.2			(0.9	)		32.3		0.0			66.5

Total current liabilities		5.0		383.6			14.4			87.8		(327.7	)		163.1
Long-term debt		0.0		413.0			0.0			64.5		(163.2	)		314.3
Other long-term liabilities		0.0		116.6			2.5			32.4		0.0			151.5

Total liabilities		5.0		913.2			16.9			184.7		(490.9	)		628.9
Koppers shareholders’ equity		112.5		(406.9	)		426.1			194.9		(214.1	)		112.5
Noncontrolling interests		0.0		0.0			0.0			12.7		0.0			12.7

Total liabilities and equity	$	117.5	$	506.3		$	443.0		$	392.3	$	(705.0	)	$	754.1

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	54.1	$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			79.2		(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			84.2		0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.1		0.0			9.3
Other current assets		0.0		6.8			0.3			26.4		0.0			33.5

Total current assets		5.5		204.9			282.8			244.0		(309.8	)		427.4
Equity investments		93.9		77.1			26.3			3.9		(196.3	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			53.6		0.0			155.6
Goodwill		0.0		39.8			0.0			32.3		0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		11.1		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			44.4		(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.6		$	57.5	$	(309.8	)	$	102.1
Accrued liabilities		4.5		27.2			(0.6	)		37.4		0.0			68.3
Short-term debt and current portion of long-term debt		0.0		0.0			0.0			0.0		0.0			0.0

Total current liabilities		4.6		371.7			9.0			94.9		(309.8	)		170.4
Long-term debt		0.0		400.8			0.0			69.0		(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			32.0		0.0			151.0

Total liabilities		4.6		889.0			11.5			195.9		(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			181.0		(196.3	)		94.8
Noncontrolling interests		0.0		0.0			0.0			12.4		0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	5.6		$	(9.4	)	$	0.0	$	(12.0	)	$	0.0	$	(15.8	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(2.7	)		0.0		(0.7	)		0.0		(3.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.2			0.0		0.2

Net cash provided by (used in) investing activities		0.0			(2.7	)		0.0		(0.5	)		0.0		(3.2	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			12.1			0.0		0.0			0.0		12.1
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0		(4.5	)
Stock issued (repurchased)		(1.1	)		0.0			0.0		0.0			0.0		(1.1	)

Net cash provided by (used in) financing activities		(5.6)			12.1			0.0		0.0			0.0		6.5
Effect of exchange rates on cash		0.0			0.0			0.0		1.0			0.0		1.0

Net increase (decrease) in cash and cash equivalents		0.0			0.0			0.0		(11.5)			0.0		(11.5)
Cash and cash equivalents at beginning of year		0.0			0.0			0.0		54.1			0.0		54.1

Cash and cash equivalents at end of period		$0.0			$0.0			$0.0		$42.6			$0.0		$42.6

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	4.6		$	(28.7	)	$	0.0	$	14.6		$	0.0	$	(9.5	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(3.6	)		0.0		(1.4	)		0.0		(5.0	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.0			0.0		0.0

Net cash provided by (used in) investing activities		0.0			(3.6	)		0.0		(1.4	)		0.0		(5.0	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(0.1	)		24.5			0.0		(0.8	)		0.0		23.6
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0		(0.5	)
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0		(4.5	)
Stock issued (repurchased)		0.0			0.0			0.0		0.0			0.0		0.0

Net cash provided by (used in) financing activities		(4.6	)		24.0			0.0		(0.8	)		0.0		18.6
Effect of exchange rates on cash		0.0			(0.1	)		0.0		1.2			0.0		1.1

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		13.6			0.0		5.2
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		26.9			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	40.5		$	0.0	$	40.5

22. Subsidiary Guarantor Information for Koppers Inc. Senior Notes

On December 1, 2009, Koppers Inc. issued $300.0 million principal value of Senior Notes. Koppers Holdings and each of Koppers Inc.’s wholly-owned material domestic subsidiaries other than Koppers Assurance, Inc. fully and unconditionally guarantee the payment of principal and interest on the Senior Notes. The domestic guarantor subsidiaries include World-Wide Ventures Corporation, Koppers Delaware, Inc., Koppers Concrete Products, Inc., Concrete Partners, Inc., and Koppers Asia LLC.

Separate condensed consolidating financial statement information for Koppers Holdings Inc. (the parent), Koppers Inc., domestic guarantor subsidiaries and non-guarantor subsidiaries as of December 31, 2011 and 2010 and for the years ended December 31, 2011, 2010 and 2009 is as follows:

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2011


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	854.1	$	72.6		$	585.2		$	(45.7	)	$	1,466.2
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6			496.8			(24.3	)		1,269.2
Selling, general and administrative		1.2			41.6		1.8			29.7			0.0			74.3

Operating profit (loss)		6.6			49.6		29.2			58.7			(21.4	)		122.7
Other income (expense)		29.9			0.3		0.0			0.4			(29.9	)		0.7
Interest expense (income)		0.0			27.5		(0.1	)		5.4			(5.6	)		27.2
Income taxes		(0.4	)		7.7		0.8			30.6			0.0			38.7

Income from continuing operations		36.9			14.7		28.5			23.1			(45.7	)		57.5
Discontinued operations		0.0			0.0		0.0			(19.9	)		0.0			(19.9	)
Noncontrolling interests		0.0			0.0		0.0			0.7			0.0			0.7

Net income attributable to Koppers	$	36.9		$	14.7	$	28.5		$	2.5		$	(45.7	)	$	36.9

Comprehensive income attributable to Koppers	$	18.9		$	1.1	$	28.0		$	(1.4	)	$	(27.7	)	$	18.9

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2010


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	721.2	$	45.8		$	462.3	$	(38.8	)	$	1,190.5
Cost of sales including depreciation and amortization		0.0			657.7		19.1			378.8		(25.6	)		1,030.0
Selling, general and administrative		1.6			32.2		3.3			25.3		0.0			62.4

Operating profit (loss)		(1.6	)		31.3		23.4			58.2		(13.2	)		98.1
Other income (expense)		45.0			0.2		(0.4	)		2.7		(45.0	)		2.5
Interest expense (income)		(0.2	)		27.9		0.0			4.4		(5.0	)		27.1
Income taxes		(0.5	)		1.5		12.2			15.7		0.0			28.9

Income from continuing operations		44.1			2.1		10.8			40.8		(53.2	)		44.6
Discontinued operations		0.0			0.0		(0.2	)		0.1		0.0			(0.1	)
Noncontrolling interests		0.0			0.0		0.0			0.4		0.0			0.4

Net income attributable to Koppers	$	44.1		$	2.1	$	10.6		$	40.5	$	(53.2	)	$	44.1

Comprehensive income attributable to Koppers	$	54.6		$	1.8	$	18.9		$	43.0	$	(63.7	)	$	54.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	709.1		$	33.0		$	373.1		$	(40.0	)	$	1,075.2
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		303.2			(16.2	)		924.2
Selling, general and administrative		1.8			28.8			3.0			23.7			0.0			57.3

Operating profit (loss)		(1.8	)		39.4			33.7			46.2			(23.8	)		93.7
Other income (expense)		40.2			0.5			(0.3	)		(0.4	)		(40.2	)		(0.2	)
Interest expense (income)		31.1			28.5			0.0			4.1			(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			11.9			0.0			13.4

Income from continuing operations		18.8			9.4			22.4			29.8			(59.0	)		21.4
Discontinued operations		0.0			(0.3	)		0.0			0.3			0.0			0.0
Noncontrolling interests		0.0			0.0			0.0			2.6			0.0			2.6

Net income attributable to Koppers	$	18.8		$	9.1		$	22.4		$	27.5		$	(59.0	)	$	18.8

Comprehensive income attributable to Koppers	$	43.5		$	12.2		$	35.0		$	36.5		$	(83.7	)	$	43.5

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	54.1	$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			79.2		(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			84.2		0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.1		0.0			9.3
Other current assets		0.0		6.8			0.3			26.4		0.0			33.5

Total current assets		5.5		204.9			282.8			244.0		(309.8	)		427.4
Equity investments		93.9		77.1			26.3			3.9		(196.3	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			53.6		0.0			155.6
Goodwill		0.0		39.8			0.0			32.3		0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		11.1		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			44.4		(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.6		$	57.5	$	(309.8	)	$	102.1
Accrued liabilities		4.5		27.2			(0.6	)		37.4		0.0			68.3
Short-term debt and current portion of long-term debt		0.0		0.0			0.0			0.0		0.0			0.0

Total current liabilities		4.6		371.7			9.0			94.9		(309.8	)		170.4
Long-term debt		0.0		400.8			0.0			69.0		(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			32.0		0.0			151.0

Total liabilities		4.6		889.0			11.5			195.9		(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			181.0		(196.3	)		94.8
Noncontrolling interests		0.0		0.0			0.0			12.4		0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2010


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	8.4		$	0.0		$	26.9	$	0.0		$	35.3
S-T investments & restricted cash		0.0		0.0			0.0			0.0		0.0			0.0
Accounts receivable, net		16.6		80.3			460.9			107.2		(524.2	)		140.8
Inventories, net		0.0		78.3			1.2			85.9		0.0			165.4
Deferred tax assets		0.0		7.4			(1.5	)		0.0		0.0			5.9
Other current assets		0.0		6.9			0.3			15.8		0.0			23.0

Total current assets		16.6		181.3			460.9			235.8		(524.2	)		370.4
Equity investments		76.7		77.1			26.2			3.8		(179.1	)		4.7
Property, plant and equipment, net		0.0		94.7			0.0			73.5		0.0			168.2
Goodwill		0.0		39.5			0.0			32.6		0.0			72.1
Deferred tax assets		0.0		65.4			(43.8	)		4.5		0.0			26.1
Other noncurrent assets		0.0		21.6			0.0			6.2		(0.1	)		27.7

Total assets	$	93.3	$	479.6		$	443.3		$	356.4	$	(703.4	)	$	669.2

LIABILITIES AND EQUITY
Accounts payable	$	0.0	$	492.5		$	15.1		$	104.5	$	(524.2	)	$	87.9
Accrued liabilities		4.6		(6.3	)		34.8			27.4		0.0			60.5
Short-term debt and current portion of long-term debt		0.0		0.1			0.0			0.9		0.0			1.0

Total current liabilities		4.6		486.3			49.9			132.8		(524.2	)		149.4
Long-term debt		0.0		295.4			0.0			0.0		0.0			295.4
Other long-term liabilities		0.0		99.6			3.0			21.9		0.0			124.5

Total liabilities		4.6		881.3			52.9			154.7		(524.2	)		569.3
Koppers shareholders’ equity		88.7		(401.7	)		390.4			190.5		(179.2	)		88.7
Noncontrolling interests		0.0		0.0			0.0			11.2		0.0			11.2

Total liabilities and equity	$	93.3	$	479.6		$	443.3		$	356.4	$	(703.4	)	$	669.2

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.1		$	9.5			$0.0	$	49.3			$0.0	$	76.9
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(24.5	)		0.0		(9.3	)		0.0		(33.8	)
Loan to related party		0.0			0.0			0.0		(11.7	)		0.0		(11.7	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.7			0.0		0.1			0.0		0.8

Net cash (used in) investing activities		0.0			(23.8	)		0.0		(20.9	)		0.0		(44.7	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			6.3			0.0		(0.9	)		0.0		5.4
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0		(0.5	)
Dividends paid		(18.1	)		0.0			0.0		(0.1	)		0.0		(18.2	)

Net cash provided by (used in) financing activities		(18.1	)		5.8			0.0		(1.0	)		0.0		(13.3	)
Effect of exchange rates on cash		0.0			0.1			0.0		(0.2	)		0.0		(0.1	)

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		27.2			0.0		18.8
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		26.9			0.0		35.3

Cash and cash equivalents at end of period		0.0		$	0.0			0.0	$	54.1			0.0	$	54.1

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2010


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.7		$	75.2		$	0.0	$	15.9		$	(4.5	)	$	105.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(35.0	)		0.0		(30.4	)		0.0			(65.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.2			0.0		1.8			0.0			2.0

Net cash (used in) investing activities		0.0			(34.8	)		0.0		(28.6	)		0.0			(63.4	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			(40.2	)		0.0		0.0			0.0			(40.2	)
Deferred financing costs		0.0			(0.4	)		0.0		0.0			0.0			(0.4	)
Dividends paid		(18.1	)		(4.5	)		0.0		(5.0	)		4.5			(23.1	)
Stock issued (repurchased)		(0.8	)		0.2			0.0		0.0			0.0			(0.6	)

Net cash provided by (used in) financing activities		(18.9	)		(44.9	)		0.0		(5.0	)		4.5			(64.3	)
Effect of exchange rates on cash		0.0			0.0			0.0		(0.7	)		0.0			(0.7	)

Net increase (decrease) in cash and cash equivalents		(0.2	)		(4.5	)		0.0		(18.4	)		0.0			(23.1	)
Cash and cash equivalents at beginning of year		0.2			12.9			0.0		45.3			0.0			58.4

Cash and cash equivalents at end of period		0.0		$	8.4			0.0	$	26.9			0.0		$	35.3

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	231.8		$	90.7		$	0.0	$	22.5		$	(232.7	)	$	112.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(15.0	)		0.0		(5.2	)		0.0			(20.2	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			(0.7	)		0.0		0.1			0.0			(0.6	)

Net cash (used in) investing activities		0.0			(15.7	)		0.0		(5.1	)		0.0			(20.8	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(213.6	)		142.8			0.0		0.0			0.0			(70.8	)
Deferred financing costs		0.0			(8.1	)		0.0		0.0			0.0			(8.1	)
Dividends paid		(18.0	)		(232.7	)		0.0		0.0			232.7			(18.0	)

Net cash provided by (used in) financing activities		(231.6	)		(98.0	)		0.0		0.0			232.7			(96.9	)
Effect of exchange rates on cash		0.0			(1.6	)		0.0		2.3			0.0			0.7

Net increase (decrease) in cash and cash equivalents		0.2			(24.6	)		0.0		19.7			0.0			(4.7	)
Cash and cash equivalents at beginning of year		0.0			37.5			0.0		25.6			0.0			63.1

Cash and cash equivalents at end of period	$	0.2		$	12.9		$	0.0	$	45.3		$	0.0		$	58.4

Subsidiary Guarantor Information for Shelf Registration

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Subsidiary Guarantor Information for Shelf Registration [Abstract]

Subsidiary Guarantor Information for Shelf Registration

18. Subsidiary Guarantor Information for Shelf Registration

Under a registration statement on Form S-3, Koppers Holdings may sell a combination of securities, including common stock, debt securities, preferred stock, depository shares, warrants and units, from time to time in one or more offerings with an aggregate offering price of up to $325 million. In addition, Koppers Inc. may sell debt securities from time to time under the registration statement. Debt securities may be fully and unconditionally guaranteed, on a joint and several basis, by Koppers Holdings, Koppers Inc. and/or other guarantor subsidiaries which will correspond to certain subsidiaries in the United States, Europe and Australia. The non-guarantor subsidiaries consist of certain subsidiaries in the United States, China, India and Mauritius. The guarantor subsidiaries that issue guarantees, if any, will be determined when a debt offering actually occurs under the registration statement and accordingly, the condensed consolidated financial information for subsidiary guarantors will be revised to identify the subsidiaries that actually provided guarantees.

Separate condensed consolidating financial statement information for the parent, Koppers Inc., domestic guarantor subsidiaries, foreign guarantor subsidiaries and non-guarantor subsidiaries as of March 31, 2012 and 2011 and for the three months ended March 31, 2012 and 2011 is as follows:

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	211.8		$	22.4	$	52.1	$	113.1	$	(18.5	)	$	380.9
Cost of sales including depreciation and amortization		0.0			189.4			16.3		41.2		103.7		(16.9	)		333.7
Selling, general and administrative		0.4			10.5			0.4		2.5		4.2		0.0			18.0

Operating profit (loss)		(0.4	)		11.9			5.7		8.4		5.2		(1.6	)		29.2
Other income (expense)		15.9			0.0			0.3		0.0		0.4		(15.9	)		0.7
Interest expense (income)		0.1			6.8			0.0		1.1		0.5		(1.6	)		6.9
Income taxes		(0.2	)		5.1			0.1		2.0		0.2		0.0			7.2

Income from continuing operations		15.6			0.0			5.9		5.3		4.9		(15.9	)		15.8
Discontinued operations		0.0			(0.1	)		0.0		0.2		0.0		0.0			0.1
Noncontrolling interests		0.0			0.0			0.0		0.0		0.3		0.0			0.3

Net income attributable to Koppers	$	15.6		$	(0.1	)	$	5.9	$	5.5	$	4.6	$	(15.9	)	$	15.6

Comprehensive income attributable to Koppers	$	22.3		$	1.1		$	7.7	$	8.9	$	5.8	$	(23.5	)	$	22.3

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	189.2		$	18.9	$	90.2		$	56.1	$	(12.9	)	$	341.5
Cost of sales including depreciation and amortization		0.0			175.9			13.6		73.5			50.4		(10.9	)		302.5
Selling, general and administrative		0.3			9.6			0.5		5.1			2.2		0.0			17.7

Operating profit (loss)		(0.3	)		3.7			4.8		11.6			3.5		(2.0	)		21.3
Other income (expense)		9.0			0.0			0.0		(0.1	)		0.1		(9.0	)		0.0
Interest expense (income)		(0.1	)		6.9			0.0		1.3			0.6		(1.8	)		6.9
Income taxes		(0.1	)		2.2			0.0		2.9			0.2		0.0			5.2

Income from continuing operations		8.9			(5.4	)		4.8		7.3			2.8		(9.2	)		9.2
Discontinued operations		0.0			0.1			0.0		(0.3	)		0.0		0.0			(0.2	)
Noncontrolling interests		0.0			0.0			0.0		0.0			0.1		0.0			0.1

Net income attributable to Koppers	$	8.9		$	(5.3	)	$	4.8	$	7.0		$	2.7	$	(9.2	)	$	8.9

Comprehensive income attributable to Koppers	$	16.6		$	(4.4	)	$	5.7	$	13.0		$	3.6	$	(17.9	)	$	16.6

Condensed Consolidating Balance Sheet

March 31, 2012


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	11.3	$	31.3		$	0.0		$	42.6
Accounts receivable, net		5.8		113.1			300.8			86.1		75.2			(388.6	)		192.4
Inventories, net		0.0		99.0			0.0			40.8		38.5			(0.1	)		178.2
Deferred tax assets		0.0		10.9			(1.5	)		0.0		0.2			0.0			9.6
Other current assets		0.0		7.2			0.3			7.4		17.0			0.0			31.9

Total current assets		5.8		230.2			299.6			145.6		162.2			(388.7	)		454.7
Equity investments		111.7		77.1			26.5			19.8		14.1			(243.8	)		5.4
Property, plant and equipment, net		0.0		100.3			0.0			26.6		26.8			0.0			153.7
Goodwill		0.0		39.8			0.0			26.0		7.2			0.0			73.0
Deferred tax assets		0.0		41.2			(10.5	)		12.4		(1.6	)		0.0			41.5
Other noncurrent assets		0.0		17.7			126.8			20.2		40.3			(179.2	)		25.8

Total assets	$	117.5	$	506.3		$	442.4		$	250.6	$	249.0		$	(811.7	)	$	754.1

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	353.4		$	14.9		$	19.6	$	96.8		$	(388.2	)	$	96.6
Accrued liabilities		4.9		30.2			(0.9	)		24.6		7.7			0.0			66.5

Total current liabilities		5.0		383.6			14.0			44.2		104.5			(388.2	)		163.1
Long-term debt		0.0		413.0			0.0			64.5		16.4			(179.6	)		314.3
Other long-term liabilities		0.0		116.6			2.6			20.3		12.1			(0.1	)		151.5

Total liabilities		5.0		913.2			16.6			129.0		133.0			(567.9	)		628.9
Koppers shareholders’ equity		112.5		(406.9	)		425.8			121.6		103.3			(243.8	)		112.5
Noncontrolling interests		0.0		0.0			0.0			0.0		12.7			0.0			12.7

Total liabilities and equity	$	117.5	$	506.3		$	442.4		$	250.6	$	249.0		$	(811.7	)	$	754.1

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	28.4	$	25.7		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			283.5			70.7		54.1			(354.9	)		171.5
Inventories, net		0.0		74.8			0.0			49.0		35.2			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			8.7		17.7			0.0			33.5

Total current assets		5.5		204.9			282.3			156.8		132.8			(354.9	)		427.4
Equity investments		93.9		77.1			26.3			19.3		13.5			(225.2	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			26.5		27.1			0.0			155.6
Goodwill		0.0		39.8			0.0			25.2		7.1			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.1		(1.0	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.2			15.7		40.9			(179.8	)		26.4

Total assets	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.5		$	28.6	$	74.3		$	(354.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.9	)		31.7		5.8			0.0			68.3

Total current liabilities		4.6		371.7			8.6			60.3		80.1			(354.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		18.5			(179.9	)		302.1
Other long-term liabilities		0.0		116.5			2.5			19.9		12.1			0.0			151.0

Total liabilities		4.6		889.0			11.1			142.9		110.7			(534.8	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.2			112.7		97.3			(225.1	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	5.6		$	(9.4	)	$	0.0	$	(19.4	)	$	7.4		$	0.0	$	(15.8	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(2.7	)		0.0		(0.6	)		(0.1	)		0.0		(3.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.2			0.0			0.0		0.2

Net cash provided by (used in) investing activities		0.0			(2.7	)		0.0		(0.4	)		(0.1	)		0.0		(3.2	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			12.1			0.0		0.0			0.0			0.0		12.1
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		(1.1	)		0.0			0.0		0.0			0.0			0.0		(1.1	)

Net cash provided by (used in) financing activities		(5.6	)		12.1			0.0		0.0			0.0			0.0		6.5
Effect of exchange rates on cash		0.0			0.0			0.0		2.7			(1.7	)		0.0		1.0

Net increase (decrease) in cash and cash equivalents		0.0			0.0			0.0		(17.1	)		5.6			0.0		(11.5	)
Cash and cash equivalents at beginning of year		0.0			0.0			0.0		28.4			25.7			0.0		54.1

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	11.3		$	31.3		$	0.0	$	42.6

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	4.6		$	(28.7	)	$	0.0	$	12.1		$	2.5		$	0.0	$	(9.5	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(3.6	)		0.0		(1.1	)		(0.3	)		0.0		(5.0	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) investing activities		0.0			(3.6	)		0.0		(1.1	)		(0.3	)		0.0		(5.0	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(0.1	)		24.5			0.0		0.0			(0.8	)		0.0		23.6
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) financing activities		(4.6	)		24.0			0.0		0.0			(0.8	)		0.0		18.6
Effect of exchange rates on cash		0.0			(0.1	)		0.0		3.1			(1.9	)		0.0		1.1

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		14.1			(0.5	)		0.0		5.2
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		14.7			12.2			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	28.8		$	11.7		$	0.0	$	40.5

23. Subsidiary Guarantor Information for Shelf Registration

Separate condensed consolidating financial statement information for the parent, Koppers Inc., domestic guarantor subsidiaries, foreign guarantor subsidiaries and non-guarantor subsidiaries as of December 31, 2011 and 2010 and for the years ended December 31, 2011, 2010 and 2009 is as follows:

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2011


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	854.1	$	72.6	$	358.6		$	264.6	$	(83.7	)	$	1,466.2
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6		292.4			220.7		(40.6	)		1,269.2
Selling, general and administrative		1.2			41.6		1.8		19.1			10.6		0.0			74.3

Operating profit (loss)		6.6			49.6		29.2		47.1			33.3		(43.1	)		122.7
Other income (expense)		29.9			0.3		0.0		(0.2	)		0.6		(29.9	)		0.7
Interest expense (income)		0.0			27.5		0.0		5.3			1.1		(6.7	)		27.2
Income taxes		(0.4	)		7.7		0.8		23.5			7.1		0.0			38.7

Income from continuing operations		36.9			14.7		28.4		18.1			25.7		(66.3	)		57.5
Discontinued operations		0.0			0.0		0.0		(19.9	)		0.0		0.0			(19.9	)
Noncontrolling interests		0.0			0.0		0.0		0.0			0.7		0.0			0.7

Net income attributable to Koppers	$	36.9		$	14.7	$	28.4	$	(1.8	)	$	25.0	$	(66.3	)	$	36.9

Comprehensive income attributable to Koppers	$	18.9		$	1.1	$	27.9	$	(3.1	)	$	22.0	$	(47.9	)	$	18.9

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2010


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	721.2	$	45.8		$	311.7	$	156.1	$	(44.3	)	$	1,190.5
Cost of sales including depreciation and amortization		0.0			657.7		19.3			242.0		140.4		(29.4	)		1,030.0
Selling, general and administrative		1.6			32.2		3.3			18.6		6.7		0.0			62.4

Operating profit (loss)		(1.6	)		31.3		23.2			51.1		9.0		(14.9	)		98.1
Other income (expense)		45.0			0.2		(0.4	)		2.3		0.4		(45.0	)		2.5
Interest expense (income)		(0.2	)		27.9		(0.1	)		5.2		1.0		(6.7	)		27.1
Income taxes		(0.5	)		1.5		12.2			13.2		2.5		0.0			28.9

Income from continuing operations		44.1			2.1		10.7			35.0		5.9		(53.2	)		44.6
Discontinued operations		0.0			0.0		(0.2	)		0.1		0.0		0.0			(0.1	)
Noncontrolling interests		0.0			0.0		0.0			0.0		0.4		0.0			0.4

Net income attributable to Koppers	$	44.1		$	2.1	$	10.5		$	35.1	$	5.5	$	(53.2	)	$	44.1

Comprehensive income attributable to Koppers	$	54.6		$	1.8	$	18.8		$	39.5	$	5.7	$	(65.8	)	$	54.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	709.1		$	33.0		$	306.4	$	79.3		$	(52.6	)	$	1,075.2
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		248.8		67.0			(28.8	)		924.2
Selling, general and administrative		1.8			28.8			3.0			19.7		4.0			0.0			57.3

Operating profit (loss)		(1.8	)		39.4			33.7			37.9		8.3			(23.8	)		93.7
Other income (expense)		40.2			0.5			(0.3	)		0.9		(1.3	)		(40.2	)		(0.2	)
Interest expense (income)		31.1			28.5			0.0			4.2		(0.1	)		(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			9.7		2.2			0.0			13.4

Income from continuing operations		18.8			9.4			22.4			24.9		4.9			(59.0	)		21.4
Discontinued operations		0.0			(0.3	)		0.0			0.3		0.0			0.0			0.0
Noncontrolling interests		0.0			0.0			0.0			0.0		2.6			0.0			2.6

Net income attributable to Koppers	$	18.8		$	9.1		$	22.4		$	25.2	$	2.3		$	(59.0	)	$	18.8

Comprehensive income attributable to Koppers	$	43.5		$	12.2		$	35.0		$	39.1	$	1.4		$	(87.7	)	$	43.5

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	28.4	$	25.7		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			283.5			70.7		54.1			(354.9	)		171.5
Inventories, net		0.0		74.8			0.0			49.0		35.2			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			8.7		17.7			0.0			33.5

Total current assets		5.5		204.9			282.3			156.8		132.8			(354.9	)		427.4
Equity investments		93.9		77.1			26.3			19.3		13.5			(225.2	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			26.5		27.1			0.0			155.6
Goodwill		0.0		39.8			0.0			25.2		7.1			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.1		(1.0	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.2			15.7		40.9			(179.8	)		26.4

Total assets	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.5		$	28.6	$	74.3		$	(354.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.9	)		31.7		5.8			0.0			68.3

Total current liabilities		4.6		371.7			8.6			60.3		80.1			(354.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		18.5			(179.9	)		302.1
Other long-term liabilities		0.0		116.5			2.5			19.9		12.1			0.0			151.0

Total liabilities		4.6		889.0			11.1			142.9		110.7			(534.8	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.2			112.7		97.3			(225.1	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2010


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	8.4		$	0.0		$	14.7	$	12.2		$	0.0		$	35.3
S-T investments & restricted cash		0.0		0.0			0.0			0.0		0.0			0.0			0.0
Accounts receivable, net		16.6		80.3			457.4			81.3		67.2			(562.0	)		140.8
Inventories, net		0.0		78.3			1.2			71.3		14.6			0.0			165.4
Deferred tax assets		0.0		7.4			(1.5	)		0.0		0.0			0.0			5.9
Other current assets		0.0		6.9			0.3			8.8		7.0			0.0			23.0

Total current assets		16.6		181.3			457.4			176.1		101.0			(562.0	)		370.4
Equity investments		76.7		77.1			26.2			19.4		13.7			(208.4	)		4.7
Property, plant and equipment, net		0.0		94.7			0.0			46.9		26.6			0.0			168.2
Goodwill		0.0		39.5			0.0			25.4		7.2			0.0			72.1
Deferred tax assets		0.0		65.4			(43.8	)		5.3		(0.8	)		0.0			26.1
Other noncurrent assets		0.0		21.6			0.0			0.9		5.1			0.1			27.7

Total assets	$	93.3	$	479.6		$	439.8		$	274.0	$	152.8		$	(770.3	)	$	669.2

LIABILITIES AND EQUITY
Accounts payable	$	0.0	$	492.5		$	11.8		$	95.9	$	49.7		$	(562.0	)	$	87.9
Accrued liabilities		4.6		(6.3	)		34.8			20.4		7.0			0.0			60.5
Short-term debt and current portion of long-term debt		0.0		0.1			0.0			0.0		0.9			0.0			1.0

Total current liabilities		4.6		486.3			46.6			116.3		57.6			(562.0	)		149.4
Long-term debt		0.0		295.4			0.0			0.0		0.0			0.0			295.4
Other long-term liabilities		0.0		99.6			2.9			13.3		8.7			0.0			124.5

Total liabilities		4.6		881.3			49.5			129.6		66.3			(562.0	)		569.3
Koppers shareholders’ equity		88.7		(401.7	)		390.3			144.4		75.3			(208.3	)		88.7
Noncontrolling interests		0.0		0.0			0.0			0.0		11.2			0.0			11.2

Total liabilities and equity	$	93.3	$	479.6		$	439.8		$	274.0	$	152.8		$	(770.3	)	$	669.2

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.1		$	9.5		$	0.0	$	20.5		$	28.8		$	0.0	$	76.9
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(24.5	)		0.0		(6.2	)		(3.1	)		0.0		(33.8	)
Loan to related party		0.0			0.0			0.0		0.0			(11.7	)		0.0		(11.7	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.7			0.0		0.1			0.0			0.0		0.8

Net cash (used in) investing activities		0.0			(23.8	)		0.0		(6.1	)		(14.8	)		0.0		(44.7	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			6.3			0.0		0.0			(0.9	)		0.0		5.4
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(18.1	)		0.0			0.0		0.0			(0.1	)		0.0		(18.2	)

Net cash provided by (used in) financing activities		(18.1	)		5.8			0.0		0.0			(1.0	)		0.0		(13.3	)
Effect of exchange rates on cash		0.0			0.1			0.0		(0.7	)		0.5			0.0		(0.1	)

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		13.7			13.5			0.0		18.8
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		14.7			12.2			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	28.4		$	25.7		$	0.0	$	54.1

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2010


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.7		$	75.2		$	0.0	$	(15.3	)	$	31.2		$	(4.5	)	$	105.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(35.0	)		0.0		(7.0	)		(23.4	)		0.0			(65.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.2			0.0		1.7			0.1			0.0			2.0

Net cash (used in) investing activities		0.0			(34.8	)		0.0		(5.3	)		(23.3	)		0.0			(63.4	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			(40.2	)		0.0		0.0			0.0			0.0			(40.2	)
Deferred financing costs		0.0			(0.4	)		0.0		0.0			0.0			0.0			(0.4	)
Dividends paid		(18.1	)		(4.5	)		0.0		0.0			(5.0	)		4.5			(23.1	)
Stock issued (repurchased)		(0.8	)		0.2			0.0		0.0			0.0			0.0			(0.6	)

Net cash provided by (used in) financing activities		(18.9	)		(44.9	)		0.0		0.0			(5.0	)		4.5			(64.3	)
Effect of exchange rates on cash		0.0			0.0			0.0		(1.6	)		0.9			0.0			(0.7	)

Net increase (decrease) in cash and cash equivalents		(0.2	)		(4.5	)		0.0		(22.2	)		3.8			0.0			(23.1	)
Cash and cash equivalents at beginning of year		0.2			12.9			0.0		36.9			8.4			0.0			58.4

Cash and cash equivalents at end of period	$	0.0		$	8.4		$	0.0	$	14.7		$	12.2		$	0.0		$	35.3

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	231.8		$	90.7		$	0.0	$	19.5		$	3.0		$	(232.7	)	$	112.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(15.0	)		0.0		(3.7	)		(1.5	)		0.0			(20.2	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			(0.7	)		0.0		0.1			0.0			0.0			(0.6	)

Net cash (used in) investing activities		0.0			(15.7	)		0.0		(3.6	)		(1.5	)		0.0			(20.8	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(213.6	)		142.8			0.0		0.0			0.0			0.0			(70.8	)
Deferred financing costs		0.0			(8.1	)		0.0		0.0			0.0			0.0			(8.1	)
Dividends paid		(18.0	)		(232.7	)		0.0		0.0			0.0			232.7			(18.0	)

Net cash provided by (used in) financing activities		(231.6	)		(98.0	)		0.0		0.0			0.0			232.7			(96.9	)
Effect of exchange rates on cash		0.0			(1.6	)		0.0		2.3			0.0			0.0			0.7

Net increase (decrease) in cash and cash equivalents		0.2			(24.6	)		0.0		18.2			1.5			0.0			(4.7	)
Cash and cash equivalents at beginning of year		0.0			37.5			0.0		18.7			6.9			0.0			63.1

Cash and cash equivalents at end of period	$	0.2		$	12.9		$	0.0	$	36.9		$	8.4		$	0.0		$	58.4

Related Party Transactions

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Related Party Transactions

19. Related Party Transactions

In November 2011, the Company loaned $11.7 million to TKK, a 30-percent owned company in China. The loan is repayable in November 2012.

19. Related Party Transactions

In November 2011, the Company loaned $11.7 million to TKK, a 30-percent owned company in China. The loan is repayable in November 2012.

In connection with the issuance of the Senior Notes in December 2009, Walter W. Turner, President and Chief Executive Officer of Koppers Holdings Inc. and Koppers Inc., purchased $500,000 aggregate principal amount of Senior Notes at the offering price of 98.311 percent, or $491,555. The offering price for this purchase represents the same offering price paid by the purchasers for the remaining $295.0 million of Senior Notes.

- Definition

The entire disclosure for related party transactions, including the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph k

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 3A
-Section 04
-Paragraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864

+ Details

Subsequent Events

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Subsequent Events [Abstract]

Subsequent Events

20. Subsequent Event

On or about June 27, 2012, the Company expects to file a registration statement on Form S-3 with the Securities and Exchange Commission. Under this registration statement, Koppers Holdings may sell a combination of securities, including common stock, debt securities, preferred stock, depository shares, warrants and units, from time to time in one or more offerings. In addition, Koppers Inc. may sell debt securities from time to time under the registration statement. Debt securities may be fully and unconditionally guaranteed, on a joint and several basis, by Koppers Holdings, Koppers Inc. and/or other guarantor subsidiaries which will correspond to certain subsidiaries in the United States, Europe and Australia. The non-guarantor subsidiaries consist of certain subsidiaries in the United States, China, India and Mauritius. The guarantor subsidiaries that issue guarantees, if any, will be determined when a debt offering actually occurs under the registration statement and accordingly, the condensed consolidated financial information for subsidiary guarantors will be revised to identify the subsidiaries that actually provided guarantees.

Separate condensed consolidating financial statement information for the parent, Koppers Inc., domestic guarantor subsidiaries, foreign guarantor subsidiaries and non-guarantor subsidiaries as of December 31, 2011 and 2010 and for the years ended December 31, 2011, 2010 and 2009 is as follows:

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	211.8		$	22.4	$	124.4	$	38.8	$	(16.5	)	$	380.9
Cost of sales including depreciation and amortization		0.0			189.5			16.3		106.5		36.4		(15.0	)		333.7
Selling, general and administrative		0.4			10.5			0.4		5.8		0.9		0.0			18.0

Operating profit (loss)		(0.4	)		11.8			5.7		12.1		1.5		(1.5	)		29.2
Other income (expense)		15.9			0.0			0.3		0.0		0.4		(15.9	)		0.7
Interest expense (income)		0.1			6.7			0.0		1.0		0.6		(1.5	)		6.9
Income taxes		(0.2	)		5.1			0.1		2.0		0.2		0.0			7.2

Income from continuing operations		15.6			0.0			5.9		9.1		1.1		(15.9	)		15.8
Discontinued operations		0.0			(0.1	)		0.0		0.2		0.0		0.0			0.1
Noncontrolling interests		0.0			0.0			0.0		0.0		0.3		0.0			0.3

Net income attributable to Koppers	$	15.6		$	(0.1	)	$	5.9	$	9.3	$	0.8	$	(15.9	)	$	15.6

Comprehensive income attributable to Koppers	$	22.3		$	1.1		$	7.7	$	13.5	$	0.9	$	(23.2	)	$	22.3

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	189.2		$	18.9	$	108.8		$	36.3	$	(11.7	)	$	341.5
Cost of sales including depreciation and amortization		0.0			175.9			13.5		89.4			33.9		(10.2	)		302.5
Selling, general and administrative		0.3			9.6			0.5		6.4			0.9		0.0			17.7

Operating profit (loss)		(0.3	)		3.7			4.9		13.0			1.5		(1.5	)		21.3
Other income (expense)		9.0			0.0			0.0		(0.1	)		0.1		(9.0	)		0.0
Interest expense (income)		(0.1	)		6.9			0.0		1.1			0.3		(1.3	)		6.9
Income taxes		(0.1	)		2.1			0.0		3.1			0.1		0.0			5.2

Income from continuing operations		8.9			(5.3	)		4.9		8.7			1.2		(9.2	)		9.2
Discontinued operations		0.0			0.0			0.0		(0.2	)		0.0		0.0			(0.2	)
Noncontrolling interests		0.0			0.0			0.0		0.0			0.1		0.0			0.1

Net income attributable to Koppers	$	8.9		$	(5.3	)	$	4.9	$	8.5		$	1.1	$	(9.2	)	$	8.9

Comprehensive income attributable to Koppers	$	16.6		$	(4.4	)	$	5.8	$	14.5		$	1.3	$	(17.2	)	$	16.6

Condensed Consolidating Balance Sheet

March 31, 2012


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	40.0	$	2.6		$	0.0		$	42.6
Accounts receivable, net		5.8		113.1			301.3			81.1		19.1			(328.0	)		192.4
Inventories, net		0.0		99.0			0.0			71.1		8.2			(0.1	)		178.2
Deferred tax assets		0.0		10.9			(1.5	)		0.0		0.2			0.0			9.6
Other current assets		0.0		7.2			0.3			9.9		14.5			0.0			31.9

Total current assets		5.8		230.2			300.1			202.1		44.6			(328.1	)		454.7
Equity investments		111.7		77.1			26.5			19.8		4.2			(233.9	)		5.4
Property, plant and equipment, net		0.0		100.3			0.0			38.0		15.4			0.0			153.7
Goodwill		0.0		39.8			0.0			31.9		1.3			0.0			73.0
Deferred tax assets		0.0		41.2			(10.5	)		12.4		(1.6	)		0.0			41.5
Other noncurrent assets		0.0		17.7			126.9			6.8		37.2			(162.8	)		25.8

Total assets	$	117.5	$	506.3		$	443.0		$	311.0	$	101.1		$	(724.8	)	$	754.1

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	353.4		$	15.3		$	36.7	$	18.8		$	(327.7	)	$	96.6
Accrued liabilities		4.9		30.2			(0.9	)		26.4		5.9			0.0			66.5

Total current liabilities		5.0		383.6			14.4			63.1		24.7			(327.7	)		163.1
Long-term debt		0.0		413.0			0.0			64.5		0.0			(163.2	)		314.3
Other long-term liabilities		0.0		116.6			2.5			26.1		6.3			0.0			151.5

Total liabilities		5.0		913.2			16.9			153.7		31.0			(490.9	)		628.9
Koppers shareholders’ equity		112.5		(406.9	)		426.1			157.3		57.4			(233.9	)		112.5
Noncontrolling interests		0.0		0.0			0.0			0.0		12.7			0.0			12.7

Total liabilities and equity	$	117.5	$	506.3		$	443.0		$	311.0	$	101.1		$	(724.8	)	$	754.1

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	45.1	$	9.0		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			65.5		13.7			(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			77.2		7.0			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			12.0		14.4			0.0			33.5

Total current assets		5.5		204.9			282.8			199.8		44.2			(309.8	)		427.4
Equity investments		93.9		77.1			26.3			19.3		3.9			(215.6	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			37.8		15.8			0.0			155.6
Goodwill		0.0		39.8			0.0			31.0		1.3			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.7		(1.6	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			6.7		37.7			(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.8		$	44.4	$	13.2		$	(309.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.8	)		30.5		6.9			0.0			68.3

Total current liabilities		4.6		371.7			9.0			74.9		20.1			(309.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		6.3			(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			25.8		6.1			0.1			151.0

Total liabilities		4.6		889.0			11.5			163.4		32.5			(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			143.9		56.4			(215.6	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	5.6		$	(9.4	)	$	0.0	$	(5.6	)	$	(6.4	)	$	0.0	$	(15.8	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(2.7	)		0.0		(0.7	)		0.0			0.0		(3.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.2			0.0			0.0		0.2

Net cash provided by (used in) investing activities		0.0			(2.7	)		0.0		(0.5	)		0.0			0.0		(3.2	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			12.1			0.0		0.0			0.0			0.0		12.1
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		(1.1	)		0.0			0.0		0.0			0.0			0.0		(1.1	)

Net cash provided by (used in) financing activities		(5.6	)		12.1			0.0		0.0			0.0			0.0		6.5
Effect of exchange rates on cash		0.0			0.0			0.0		1.0			0.0			0.0		1.0

Net increase (decrease) in cash and cash equivalents		0.0			0.0			0.0		(5.1	)		(6.4	)		0.0		(11.5	)
Cash and cash equivalents at beginning of year		0.0			0.0			0.0		45.1			9.0			0.0		54.1

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	40.0		$	2.6		$	0.0	$	42.6

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	4.6		$	(28.7	)	$	0.0	$	17.7		$	(3.1	)	$	0.0	$	(9.5	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(3.6	)		0.0		(1.4	)		0.0			0.0		(5.0	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) investing activities		0.0			(3.6	)		0.0		(1.4	)		0.0			0.0		(5.0	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(0.1	)		24.5			0.0		(0.9	)		0.1			0.0		23.6
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) financing activities		(4.6	)		24.0			0.0		(0.9	)		0.1			0.0		18.6
Effect of exchange rates on cash		0.0			(0.1	)		0.0		1.1			0.1			0.0		1.1

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		16.5			(2.9	)		0.0		5.2
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		17.0			9.9			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	33.5		$	7.0		$	0.0	$	40.5

21. Subsequent events

On February 18, 2012, a leak of material from a storage tank containing coal tar pitch was detected at its terminal facility in Portland, Victoria, Australia. All of the coal tar pitch was contained within the tank farm area and no release of material to water or soil occurred. The Company currently estimates the financial effect of the event is approximately $5.0 million. The facility is part of the Carbon Materials & Chemicals segment.

On February 14, 2012, the Company announced its intention to close its wood treating facility in Grenada, Mississippi effective on or around July 31, 2012. The Company estimates that it will incur charges of approximately $2.5 million over the next two years to close this facility which is part of the Railroad & Utility Products segment.

On or about June 27, 2012, the Company expects to file a registration statement on Form S-3 with the Securities and Exchange Commission. Under this registration statement, Koppers Holdings may sell a combination of securities, including common stock, debt securities, preferred stock, depository shares, warrants and units from time to time in one or more offerings. In addition, Koppers Inc. may sell debt securities from time to time under the registration statement. Debt securities may be fully and unconditionally guaranteed, on a joint and several basis, by Koppers Holdings, Koppers Inc. and/or other guarantor subsidiaries which will correspond to certain subsidiaries in the United States, Europe and Australia. The non-guarantor subsidiaries consist of certain subsidiaries in the United States, China, India and Mauritius. The guarantor subsidiaries that issue guarantees, if any, will be determined when a debt offering actually occurs under the registration statement and accordingly, the condensed consolidated financial information for subsidiary guarantors will be revised to identify the subsidiaries that actually provided guarantees.

Separate condensed consolidating financial statement information for the parent, Koppers Inc., domestic guarantor subsidiaries, foreign guarantor subsidiaries and non-guarantor subsidiaries as of December 31, 2011 and 2010 and for the years ended December 31, 2011, 2010 and 2009 is as follows:

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2011


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	854.1	$	72.6		$	443.6		$	147.0	$	(51.1	)	$	1,466.2
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6			363.7			138.5		(29.7	)		1,269.2
Selling, general and administrative		1.2			41.6		1.8			26.2			3.5		0.0			74.3

Operating profit (loss)		6.6			49.6		29.2			53.7			5.0		(21.4	)		122.7
Other income (expense)		29.9			0.3		0.0			(0.3	)		0.7		(29.9	)		0.7
Interest expense (income)		0.0			27.5		(0.1	)		4.9			0.5		(5.6	)		27.2
Income taxes		(0.4	)		7.7		0.8			28.7			1.9		0.0			38.7

Income from continuing operations		36.9			14.7		28.5			19.8			3.3		(45.7	)		57.5
Discontinued operations		0.0			0.0		0.0			(19.9	)		0.0		0.0			(19.9	)
Noncontrolling interests		0.0			0.0		0.0			0.0			0.7		0.0			0.7

Net income attributable to Koppers	$	36.9		$	14.7	$	28.5		$	(0.1	)	$	2.6	$	(45.7	)	$	36.9

Comprehensive income attributable to Koppers	$	18.9		$	1.1	$	28.0		$	(5.1	)	$	3.5	$	(27.5	)	$	18.9

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2010


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	721.2	$	45.8		$	358.5	$	105.9	$	(40.9	)	$	1,190.5
Cost of sales including depreciation and amortization		0.0			657.7		19.1			286.0		94.9		(27.7	)		1,030.0
Selling, general and administrative		1.6			32.2		3.3			21.4		3.9		0.0			62.4

Operating profit (loss)		(1.6	)		31.3		23.4			51.1		7.1		(13.2	)		98.1
Other income (expense)		45.0			0.2		(0.4	)		2.4		0.3		(45.0	)		2.5
Interest expense (income)		(0.2	)		27.9		0.0			4.4		0.0		(5.0	)		27.1
Income taxes		(0.5	)		1.5		12.2			13.3		2.4		0.0			28.9

Income from continuing operations		44.1			2.1		10.8			35.8		5.0		(53.2	)		44.6
Discontinued operations		0.0			0.0		(0.2	)		0.1		0.0		0.0			(0.1	)
Noncontrolling interests		0.0			0.0		0.0			0.0		0.4		0.0			0.4

Net income attributable to Koppers	$	44.1		$	2.1	$	10.6		$	35.9	$	4.6	$	(53.2	)	$	44.1

Comprehensive income attributable to Koppers	$	54.6		$	1.8	$	18.9		$	40.3	$	5.1	$	(66.1	)	$	54.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	709.1		$	33.0		$	306.4	$	79.3		$	(52.6	)	$	1,075.2
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		248.8		67.0			(28.8	)		924.2
Selling, general and administrative		1.8			28.8			3.0			19.7		4.0			0.0			57.3

Operating profit (loss)		(1.8	)		39.4			33.7			37.9		8.3			(23.8	)		93.7
Other income (expense)		40.2			0.5			(0.3	)		0.9		(1.3	)		(40.2	)		(0.2	)
Interest expense (income)		31.1			28.5			0.0			4.2		(0.1	)		(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			9.7		2.2			0.0			13.4

Income from continuing operations		18.8			9.4			22.4			24.9		4.9			(59.0	)		21.4
Discontinued operations		0.0			(0.3	)		0.0			0.3		0.0			0.0			0.0
Noncontrolling interests		0.0			0.0			0.0			0.0		2.6			0.0			2.6

Net income attributable to Koppers	$	18.8		$	9.1		$	22.4		$	25.2	$	2.3		$	(59.0	)	$	18.8

Comprehensive income attributable to Koppers	$	43.5		$	12.2		$	35.0		$	39.1	$	1.4		$	(87.7	)	$	43.5

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	45.1	$	9.0		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			65.5		13.7			(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			77.2		7.0			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			12.0		14.4			0.0			33.5

Total current assets		5.5		204.9			282.8			199.8		44.2			(309.8	)		427.4
Equity investments		93.9		77.1			26.3			19.3		3.9			(215.6	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			37.8		15.8			0.0			155.6
Goodwill		0.0		39.8			0.0			31.0		1.3			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.7		(1.6	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			6.7		37.7			(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.8		$	44.4	$	13.2		$	(309.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.8	)		30.5		6.9			0.0			68.3

Total current liabilities		4.6		371.7			9.0			74.9		20.1			(309.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		6.3			(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			25.8		6.1			0.1			151.0

Total liabilities		4.6		889.0			11.5			163.4		32.5			(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			143.9		56.4			(215.6	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2010


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	8.4		$	0.0		$	17.0	$	9.9		$	0.0		$	35.3
S-T investments & restricted cash		0.0		0.0			0.0			0.0		0.0			0.0			0.0
Accounts receivable, net		16.6		80.3			460.9			63.3		44.2			(524.5	)		140.8
Inventories, net		0.0		78.3			1.2			76.4		9.5			0.0			165.4
Deferred tax assets		0.0		7.4			(1.5	)		0.0		0.0			0.0			5.9
Other current assets		0.0		6.9			0.3			14.3		1.5			0.0			23.0

Total current assets		16.6		181.3			460.9			171.0		65.1			(524.5	)		370.4
Equity investments		76.7		77.1			26.2			19.4		3.9			(198.6	)		4.7
Property, plant and equipment, net		0.0		94.7			0.0			57.6		15.9			0.0			168.2
Goodwill		0.0		39.5			0.0			31.3		1.3			0.0			72.1
Deferred tax assets		0.0		65.4			(43.8	)		5.9		(1.4	)		0.0			26.1
Other noncurrent assets		0.0		21.6			0.0			4.7		1.3			0.1			27.7

Total assets	$	93.3	$	479.6		$	443.3		$	289.9	$	86.1		$	(723.0	)	$	669.2

LIABILITIES AND EQUITY
Accounts payable	$	0.0	$	492.5		$	15.1		$	94.7	$	10.0		$	(524.4	)	$	87.9
Accrued liabilities		4.6		(6.3	)		34.8			21.7		5.7			0.0			60.5
Short-term debt and current portion of long-term debt		0.0		0.1			0.0			0.8		0.1			0.0			1.0

Total current liabilities		4.6		486.3			49.9			117.2		15.8			(524.4	)		149.4
Long-term debt		0.0		295.4			0.0			0.0		0.0			0.0			295.4
Other long-term liabilities		0.0		99.6			3.0			15.7		6.2			0.0			124.5

Total liabilities		4.6		881.3			52.9			132.9		22.0			(524.4	)		569.3
Koppers shareholders’ equity		88.7		(401.7	)		390.4			157.0		52.9			(198.6	)		88.7
Noncontrolling interests		0.0		0.0			0.0			0.0		11.2			0.0			11.2

Total liabilities and equity	$	93.3	$	479.6		$	443.3		$	289.9	$	86.1		$	(723.0	)	$	669.2

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.1		$	9.5		$	0.0	$	37.9		$	11.4		$	0.0	$	76.9
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(24.5	)		0.0		(8.6	)		(0.7	)		0.0		(33.8	)
Loan to related party		0.0			0.0			0.0		0.0			(11.7	)		0.0		(11.7	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.7			0.0		0.1			0.0			0.0		0.8

Net cash (used in) investing activities		0.0			(23.8	)		0.0		(8.5	)		(12.4	)		0.0		(44.7	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			6.3			0.0		(0.9	)		0.0			0.0		5.4
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(18.1	)		0.0			0.0		0.0			(0.1	)		0.0		(18.2	)

Net cash provided by (used in) financing activities		(18.1	)		5.8			0.0		(0.9	)		(0.1	)		0.0		(13.3	)
Effect of exchange rates on cash		0.0			0.1			0.0		(0.4	)		0.2			0.0		(0.1	)

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		28.1			(0.9	)		0.0		18.8
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		17.0			9.9			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	45.1		$	9.0		$	0.0	$	54.1

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2010


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.7		$	75.2		$	0.0	$	9.1		$	6.8		$	(4.5	)	$	105.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(35.0	)		0.0		(30.0	)		(0.4	)		0.0			(65.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.2			0.0		1.7			0.1			0.0			2.0

Net cash (used in) investing activities		0.0			(34.8	)		0.0		(28.3	)		(0.3	)		0.0			(63.4	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			(40.2	)		0.0		0.0			0.0			0.0			(40.2	)
Deferred financing costs		0.0			(0.4	)		0.0		0.0			0.0			0.0			(0.4	)
Dividends paid		(18.1	)		(4.5	)		0.0		0.0			(5.0	)		4.5			(23.1	)
Stock issued (repurchased)		(0.8	)		0.2			0.0		0.0			0.0			0.0			(0.6	)

Net cash provided by (used in) financing activities		(18.9	)		(44.9	)		0.0		0.0			(5.0	)		4.5			(64.3	)
Effect of exchange rates on cash		0.0			0.0			0.0		(0.7	)		0.0			0.0			(0.7	)

Net increase (decrease) in cash and cash equivalents		(0.2	)		(4.5	)		0.0		(19.9	)		1.5			0.0			(23.1	)
Cash and cash equivalents at beginning of year		0.2			12.9			0.0		36.9			8.4			0.0			58.4

Cash and cash equivalents at end of period	$	0.0		$	8.4		$	0.0	$	17.0		$	9.9		$	0.0		$	35.3

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	231.8		$	90.7		$	0.0	$	19.5		$	3.0		$	(232.7	)	$	112.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(15.0	)		0.0		(3.7	)		(1.5	)		0.0			(20.2	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			(0.7	)		0.0		0.1			0.0			0.0			(0.6	)

Net cash (used in) investing activities		0.0			(15.7	)		0.0		(3.6	)		(1.5	)		0.0			(20.8	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(213.6	)		142.8			0.0		0.0			0.0			0.0			(70.8	)
Deferred financing costs		0.0			(8.1	)		0.0		0.0			0.0			0.0			(8.1	)
Dividends paid		(18.0	)		(232.7	)		0.0		0.0			0.0			232.7			(18.0	)

Net cash provided by (used in) financing activities		(231.6	)		(98.0	)		0.0		0.0			0.0			232.7			(96.9	)
Effect of exchange rates on cash		0.0			(1.6	)		0.0		2.3			0.0			0.0			0.7

Net increase (decrease) in cash and cash equivalents		0.2			(24.6	)		0.0		18.2			1.5			0.0			(4.7	)
Cash and cash equivalents at beginning of year		0.0			37.5			0.0		18.7			6.9			0.0			63.1

Cash and cash equivalents at end of period	$	0.2		$	12.9		$	0.0	$	36.9		$	8.4		$	0.0		$	58.4

Description of Business

12 Months Ended

Dec. 31, 2011

Description of Business [Abstract]

Description of Business

1. Description of Business

Parent company of Koppers Inc. – In these financial statements, unless otherwise indicated or the context requires otherwise, when the terms “Koppers,” the “Company,” “we,” “our” or “us,” are used, they mean Koppers Holdings Inc. (“Koppers Holdings”) and its subsidiaries on a consolidated basis. The use of these terms is not intended to imply that Koppers Holdings and Koppers Inc. are not separate and distinct legal entities from each other and from their respective subsidiaries. Koppers Holdings has no direct operations and no significant assets other than the stock of Koppers Inc. It depends on the dividends from the earnings of Koppers Inc. and its subsidiaries to generate the funds necessary to meet its financial obligations. The terms of Koppers Inc.’s revolving credit facility prohibit Koppers Inc. from paying dividends and otherwise transferring assets except for certain limited dividends. Further, the terms of the indenture governing Koppers Inc.’s Senior Notes significantly restrict Koppers Inc. from paying dividends and otherwise transferring assets to Koppers Holdings.

Business description – The Company is a global integrated producer of carbon compounds and treated and untreated wood products and services for use in a variety of markets including the aluminum, railroad, specialty chemical, utility, concrete and steel industries. The Company’s business is operated through two business segments, Carbon Materials & Chemicals and Railroad & Utility Products.

The Company’s Railroad & Utility Products segment sells treated and untreated wood products, rail joint bars and services primarily to the railroad industry and treated wood products to the utility industry. Railroad products include procuring and treating items such as crossties, switch ties and various types of lumber used for railroad bridges and crossings and the manufacture of rail joint bars. Utility products include transmission and distribution poles and pilings. The segment also produces concrete crossties through a joint venture.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of presentation – The consolidated financial statements include the accounts of the Company and all majority-owned subsidiaries for which the Company is deemed to exercise control over its operations. All significant intercompany transactions have been eliminated in consolidation. The Company’s investments in 20 percent to 50 percent-owned companies in which it has the ability to exercise significant influence over operating and financial policies are accounted for using the equity method of accounting. Accordingly, the Company’s share of the earnings of these companies is included in the accompanying consolidated statement of income.

Use of estimates – Accounting principles generally accepted in the U.S. require management to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingencies on the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Estimates have been prepared on the basis of the most current and best available information and actual results could differ materially from these estimates.

Foreign currency translation – For consolidated entities outside of the U.S. that prepare financial statements in currencies other than the U.S. dollar, results of operations and cash flows are translated at average exchange rates during the period, and asset and liabilities are translated at end-of-period exchange rates. Cumulative translation adjustments are included as a separate component of accumulated other comprehensive loss in shareholders’ equity. Amounts credited (charged) to cumulative translation adjustments for intercompany loans totaled $(0.5) million in 2011, $7.2 million in 2010 and $12.7 million in 2009.

Foreign currency transaction gains and losses result from transactions denominated in a currency which is different than the currency used by the entity to prepare its financial statements. Foreign currency transaction losses were $0.5 million, $2.3 million and $1.9 million for the years ended December 31, 2011, 2010 and 2009, respectively.

Revenue recognition – The Company recognizes revenue when the risks and rewards of ownership and title to the product have transferred to the customer. Revenue recognition generally occurs at the point of shipment; however in certain circumstances as shipping terms dictate, revenue is recognized at the point of destination. Shipping and handling costs are included as a component of cost of sales.

The Company recognizes revenue related to the procurement of certain untreated railroad crossties upon transfer of title to the customer, which occurs upon delivery to the Company’s plant and acceptance by the customer. Service revenue, consisting primarily of wood treating services, is recognized at the time the service is provided. Payment on sales of untreated railroad crossties and wood treating services are generally due within 30 days of the invoice date. The Company’s recognition of revenue with respect to untreated crossties meets all the recognition criteria of Securities and Exchange Commission Staff Accounting Bulletin Topic 13.A.3., including transfer of title and risk of ownership, the existence of fixed purchase commitments and delivery schedules established by the customer, and the completion of all performance obligations by the Company. Revenue recognized for untreated crosstie sales for the years ended December 31, 2011, 2010 and 2009 amounted to $116.5 million, $106.4 million and $119.1 million, respectively.

Research & development – Research and development costs are expensed as incurred and are included in selling, general and administrative expenses. These costs totaled $1.9 million in 2011, $2.1 million in 2010 and $2.0 million in 2009.

Cash and cash equivalents – Cash and cash equivalents include cash on hand and on deposit and investments in highly liquid investments with an original maturity of 90 days or less.

Accounts receivable – The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. In circumstances where the Company becomes aware of a specific customer’s inability to meet its financial obligations to Koppers, a specific reserve for bad debts is recorded against amounts due. If the financial condition of the Company’s customers were to deteriorate, resulting in an inability to make payments, additional allowances may be required.

Inventories – Inventories are carried at lower of cost or market on a worldwide basis. In the U.S., inventory cost (excluding miscellaneous types of inventory) is determined primarily utilizing the last-in, first-out (“LIFO”) basis. Inventory cost outside the U.S. is determined utilizing the first-in, first-out (“FIFO”) basis. Market represents replacement cost for raw materials and net realizable value for work in process and finished goods. LIFO inventories constituted approximately 59 percent of the FIFO inventory value at December 31, 2011 and 2010.

Property, plant & equipment – Property, plant and equipment are recorded at purchased cost and include improvements which significantly increase capacities or extend useful lives of existing plant and equipment. Depreciation expense is calculated by applying the straight-line method over estimated useful lives. Estimated useful lives for buildings generally range from 10 to 20 years and depreciable lives for machinery and equipment generally range from 3 to 10 years. Net gains and losses related to asset disposals are recognized in earnings in the period in which the disposal occurs. Routine repairs, replacements and maintenance are expensed as incurred.

The Company periodically evaluates whether current facts and circumstances indicate that the carrying value of its depreciable long-lived assets may not be recoverable. If an asset, or logical grouping of assets, is determined to be impaired, the asset is written down to its fair value using discounted future cash flows and, if available, quoted market prices.

Goodwill & other intangible assets – Goodwill and other purchased intangible assets are included in the identifiable assets of the business segment to which they have been assigned. The Company performs impairment tests annually for goodwill, and more often as circumstances require. When it is determined that impairment has occurred, an appropriate charge to earnings is recorded. The Company performed its annual impairment test in the fourth quarters of 2011 and 2010 and determined that the estimated fair values substantially exceeded the carrying values of all the reporting units and accordingly, there was no impairment of goodwill.

Identifiable intangible assets, other than goodwill, are recorded at cost. Identifiable intangible assets that do not have indefinite lives are amortized on a straight-line basis over their estimated useful lives.

Deferred income taxes – Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. The effect on deferred tax assets and liabilities of a change in tax laws is recognized in earnings in the period the new laws are enacted. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets unless it is more likely than not that such assets will be realized. Deferred tax liabilities have not been recognized for the undistributed earnings of certain foreign subsidiaries because management intends to permanently reinvest such earnings in foreign operations.

Self-insured liabilities – The Company is self-insured for property, casualty and workers’ compensation exposures up to various stop-loss coverage amounts. Losses are accrued based upon the Company’s estimates of the liability for the related deductibles of claims incurred. Such estimates utilize actuarial methods based on various assumptions, which include but are not limited to, the Company’s historical loss experience and projected loss development factors. In 2011 and 2010, reversals of self-insured liabilities occurred as a result of favorable loss trends related to self-insured claims.


	2011			2010
(Dollars in millions)
Self-insured liabilities at beginning of year	$	7.9		$	12.1
Expense		2.1			2.5
Reversal of self-insured liabilities		(1.0	)		(4.5	)
Cash expenditures		(1.6	)		(2.2	)

Self-insured liabilities at end of year	$	7.4		$	7.9

Derivative financial instruments – The Company uses forward exchange contracts to hedge exposure to currency exchange rate changes on transactions and other commitments denominated in a foreign currency. Contracts are generally written on a short-term basis and are not held for trading or speculative purposes. The Company recognizes the fair value of the forward contracts as an asset or liability at each reporting date. Because the Company has not elected to designate the forward exchange contracts for hedge accounting treatment, changes in the fair value of the forward exchange contracts are recognized immediately in earnings.

During 2004, the Company entered into an interest rate swap agreement to convert the fixed rate on a portion ($50.0 million) of Koppers Inc.’s Senior Secured Notes to a floating rate based on six-month LIBOR rates plus a specified spread. On October 15, 2009 and concurrent with the redemption of the Senior Secured Notes, the swap was terminated which resulted in a gain of $1.6 million. The swap agreement required semiannual cash settlements of interest paid or received. The differential between the interest paid or interest received from semi-annual settlements were recorded as an adjustment to interest expense. The effect of the swap for the year ended December 31, 2009, including the gain on termination, was a decrease in interest expense of approximately $2.3 million.

The swap hedged the Company’s exposure related to changes in interest rates on the fair value of the Company’s fixed rate debt. The swap was accounted for as a fair value hedge and has been determined to have no ineffectiveness as the critical terms of the swap were aligned with the hedged item. Any changes in the fair value of the swap were offset by an equal and opposite change in the fair value of the hedged item; therefore there was no net impact on reported earnings.

Asset retirement obligations – Asset retirement obligations are initially recorded at fair value and are capitalized as part of the cost of the related long-lived asset when sufficient information is available to estimate fair value. The capitalized costs are subsequently charged to depreciation expense over the estimated useful life of the related long-lived asset. The fair value of the obligation is determined by calculating the discounted value of expected future cash flows and accretion expense is recorded each month to ultimately increase this obligation to full value.

The Company recognizes asset retirement obligations for the removal and disposal of residues; dismantling of certain tanks required by governmental authorities; cleaning and dismantling costs for owned rail cars; cleaning costs for leased rail cars and barges; and site demolition.

The following table describes changes to the Company’s asset retirement obligation liabilities at December 31, 2011 and 2010:


	2011			2010
(Dollars in millions)
Asset retirement obligation at beginning of year	$	17.0		$	16.6
Accretion expense		1.1			1.3
Revision in estimated cash flows		6.3			1.5
Cash expenditures		(3.1	)		(2.4	)
Acquisitions		0.0			0.3
Currency translation		0.0			(0.3	)

Asset retirement obligation at end of year	$	21.3		$	17.0

In 2011, the Company incurred $6.2 million of expense related to the closure of its carbon black facility in Kurnell, Australia.

Litigation & contingencies – Amounts associated with litigation and contingencies are accrued when management, after taking into consideration the facts and circumstances of each matter including any settlement offers, has determined that it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. Legal costs for litigation are expensed as incurred.

Other current assets – Included in other current assets are prepaid expenses totaling $9.9 million and $7.6 million at December 31, 2011 and December 31, 2010, respectively.

Environmental liabilities – The Company accrues for remediation costs and penalties when the responsibility to remediate is probable and the amount of related cost is reasonably estimable. If only a range of potential liability can be estimated and no amount within the range is more probable than another, the accrual is recorded at the low end of that range. Remediation liabilities are discounted if the amount and timing of the cash disbursements are readily determinable.

Deferred revenue from extended product warranty liabilities – The Company defers revenues associated with extended product warranty liabilities based on historical loss experience and sales of extended warranties on certain products. The following table describes changes to the Company’s deferred revenue at December 31, 2011 and 2010:


	2011			2010
(Dollars in millions)
Deferred revenue at beginning of year	$	5.7		$	6.7
Revenue earned		(0.9	)		(1.0	)

Deferred revenue at end of year	$	4.8		$	5.7

Stock-based compensation – The Company records compensation cost over the vesting period for share-based payments to employees at an amount equivalent to the grant date fair value of the stock award. No compensation cost is recognized for any stock awards that are forfeited in the event the recipient fails to meet the vesting requirements.

Business Acquisitions

12 Months Ended

Dec. 31, 2011

Business Acquisitions [Abstract]

Business Acquisitions

3. Business Acquisitions

Koppers Netherlands – On March 1, 2010, the Company acquired 100 percent of the outstanding shares of privately-owned Cindu Chemicals B.V. (“Cindu”), a Dutch company which operates a 140,000 metric ton coal tar distillation plant in Uithoorn, Netherlands. Concurrent with the acquisition, the Company entered into a long-term tar supply agreement with Tata Steel, who supplies the majority of the Uithoorn plant’s raw material requirements. The acquisition strengthens the Company’s presence in Europe and increases the Company’s ability to service its export markets. Cindu was subsequently renamed Koppers Netherlands B.V. (“Koppers Netherlands”).

The acquired company contributed revenues of $48.4 million and operating profit of $0.8 million for the year ended December 31, 2010. Depreciation and amortization associated with Koppers Netherlands totaled $1.2 million for the year ended December 31, 2010.

The acquisition was funded with cash on hand and the acquisition price was $21.6 million. The identifiable assets acquired and liabilities assumed upon the acquisition of Koppers Netherlands are shown in the table below.


	March 1, 2010
(Dollars in millions)
Cash and cash equivalents	$	2.1
Accounts receivable		6.5
Inventory		7.1
Other current assets		2.8
Property, plant and equipment		8.7
Intangibles		4.4
Goodwill		6.1

Total assets acquired		37.7
Accounts payable		9.8
Accrued liabilities		3.0
Long-term debt		0.6
Deferred tax liability		2.2
Long-term liabilities		0.5

Net assets acquired	$	21.6

All assets acquired and liabilities assumed were recorded at estimated fair value. Goodwill of $6.1 million was allocated to the Carbon Materials & Chemicals segment and is not deductible for income tax purposes under Dutch law. Net assets acquired included intangible assets with respect to a coal tar supply agreement of $2.9 million and customer relationships of $0.7 million which will be amortized over a period of ten years and a favorable lease agreement of $0.8 million which will be amortized over a period of three years. The intangible assets other than goodwill are classified in other assets in the consolidated balance sheet. Acquisition expenses were $1.8 million and $1.7 million for the years ended December 31, 2010 and 2009, respectively, and are charged to selling, general and administrative expenses.

Portec – On December 22, 2010, the Company acquired the rail joint bar business of Portec Rail Products, Inc. located in Huntington, West Virginia. The purchase price was cash of $10.7 million. The allocation of purchase price to acquired assets consisted of inventory totaling $7.1 million, plant and equipment totaling $2.7 million, intangible assets consisting primarily of customer relationships totaling $0.6 million and tax deductible goodwill of $0.3 million. The goodwill is allocated to the Railroad & Utility Products segment.

Other acquisitions – On October 31, 2010, the Company acquired the midwestern United States refined tar business of Stella Jones Inc. for cash of $6.1 million. The allocation of purchase price to acquired assets consisted of inventory totaling $1.6 million, intangible assets consisting primarily of customer relationships totaling $1.7 million and tax deductible goodwill of $2.8 million. The goodwill is allocated to the Carbon Materials & Chemicals segment.

Pro-forma information – The consolidated pro forma results of operations if the acquisitions had been completed as of the beginning of the year in 2010 would have been pro forma revenue of $1,280.4 million and operating profit of $100.1 million for the year ended December 31, 2010. The consolidated pro forma results of operations if the acquisitions had been completed as of the beginning of the year in 2009 would have been revenues of $1,191.9 million and operating profit of $91.0 million for the year ended December 31, 2009.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1490-128463

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7008-128479

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1500-128463

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4926-128472

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4922-128472

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6996-128479

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1524-128463

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1392-128463

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7000-128479

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4934-128472

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1497-128463

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1486-128463

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1383-128463

+ Details

Restructuring

12 Months Ended

Dec. 31, 2011

Restructuring [Abstract]

Restructuring

4. Restructuring

In December 2011, the Company ceased manufacturing operations at its carbon black facility located in Kurnell, Australia. This decision was made as a result of deteriorating business conditions including raw material availability and cost, competition in the export markets due to the strength of the Australian dollar and a variety of other factors. The costs related to this closure totaled $41.0 million in the fourth quarter of 2011. The Company estimates that total future closure costs related to this facility will be approximately $1.7 million, net of proceeds from inventory liquidation. The closure is expected to be completed by 2014. The results of operations of the carbon black facility have been reclassified to discontinued operations for all periods presented as run-off activities were completed in the first quarter of 2012. The facility is part of the Carbon Materials & Chemicals segment. Net sales from this discontinued operation totaled $72.7 million, $55.0 million and $49.2 million for the years ended December 31, 2011, 2010 and 2009, respectively. Operating profit (loss) from this discontinued operation totaled $(43.7) million, $0.9 million and $1.2 million for the years ended December 31, 2011, 2010 and 2009, respectively.

Details of the restructuring activities and related reserves for 2011 are as follows:


	Severance and employee benefits			Environmental remediation		Asset impairment			Inventory writedowns			Site demolition		Other		Total
(Dollars in millions)
Reserve at January 1, 2011	$	0.0		$	0.0	$	0.0		$	0.0		$	0.0	$	0.0	$	0.0
Charges		3.4			6.7		20.2			3.3			6.2		1.2		41.0
Costs charged against assets		0.0			0.0		(20.2	)		(3.3	)		0.0		0.0		(23.5	)
Cash paid		(1.6	)		0.0		0.0			0.0			0.0		0.0		(1.6	)

Reserve at December 31, 2011	$	1.8		$	6.7	$	0.0		$	0.0		$	6.2	$	1.2	$	15.9

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Equity Investments

12 Months Ended

Dec. 31, 2011

Equity Investments [Abstract]

Equity Investments

10. Equity Investments

The Company holds two investments in unconsolidated companies. KSA Limited Partnership is a 50 percent owned concrete crosstie operation located in Portsmouth, Ohio. Tangshan Koppers Kailuan Carbon Chemical Company Limited (“TKK”) commenced operation of a new tar distillation facility in the Hebei Province of China. The Company holds a 30 percent investment in TKK. Equity in earnings (losses) and total dividends received for the three years ended December 31, 2011 were as follows:


	Equity income (loss)			Dividends received
(Dollars in millions)
2011	$	0.2		$	0.0
2010		0.0			0.0
2009		(1.5	)		0.5

- Definition

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

+ References + Details

Goodwill and Other Identifiable Intangible Assets

12 Months Ended

Dec. 31, 2011

Goodwill and Other Identifiable Intangible Assets [Abstract]

Goodwill and Other Identifiable Intangible Assets

12. Goodwill and Other Identifiable Intangible Assets

The change in the carrying amount of goodwill attributable to each business segment for the years ended December 31, 2011 and December 31, 2010 was as follows:


	Carbon Materials & Chemicals			Railroad & Utility Products			Total
(Dollars in millions)
Balance at December 31, 2009	$	59.4		$	2.2		$	61.6
Acquisitions		8.6			0.0			8.6
Currency translation		1.6			0.3			1.9

Balance at December 31, 2010		69.6			2.5			72.1
Acquisitions		0.1			0.3			0.4
Currency translation		(0.3	)		(0.1	)		(0.4	)

Balance at December 31, 2011	$	69.4		$	2.7		$	72.1

The Company’s identifiable intangible assets with finite lives are being amortized over their estimated useful lives and are summarized below:


	December 31,
	2011						2010
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
(Dollars in millions)
Customer contracts	$	12.3	$	6.8	$	5.5	$	13.2	$	5.9	$	7.3
Supply contracts		2.7		0.5		2.2		2.8		0.2		2.6
Favorable lease agreements		0.8		0.5		0.3		0.8		0.2		0.6
Non-compete agreements		1.2		1.2		0.0		1.2		1.2		0.0

Total	$	17.0	$	9.0	$	8.0	$	18.0	$	7.5	$	10.5

In 2011, the gross carrying value of identifiable intangible assets decreased by $0.8 million due to the finalization of purchase price adjustments from prior year acquisitions and by $0.2 million due to foreign currency translation. In 2010, the gross carrying value of identifiable intangible assets increased by $7.4 million from acquisitions and decreased by $0.2 million due to foreign currency translation. The customer contracts and supply contracts have estimated useful lives of 10 years and the favorable lease agreements and non-compete agreements have estimated useful lives of 3 years. Total amortization expense related to these identifiable intangible assets was $1.5 million, $1.2 million and $0.8 million for the years ended December 31, 2011, 2010 and 2009, respectively. Estimated amortization expense for the next five years is summarized below:


	Estimated annual amortization
(Dollars in millions)
2012	$	1.5
2013		1.3
2014		1.2
2015		1.2
2016		0.8

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Leases

12 Months Ended

Dec. 31, 2011

Leases [Abstract]

Leases

14. Leases

Future minimum commitments for operating leases having non-cancelable lease terms in excess of one year are as follows:



(Dollars in millions)
2012	$	38.1
2013		27.9
2014		13.5
2015		7.9
2016		6.3
Thereafter		31.1

Total	$	124.8

Operating lease expense for 2011, 2010 and 2009 was $43.8 million, $42.5 million and $41.5 million, respectively.

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References + Details

Common Stock and Senior Convertible Preferred Stock

12 Months Ended

Dec. 31, 2011

Common Stock and Senior Convertible Preferred Stock [Abstract]

Common Stock and Senior Convertible Preferred Stock

16. Common Stock and Senior Convertible Preferred Stock

Changes in senior convertible preferred stock, common stock and treasury stock for the three years ended December 31, 2011 are as follows:


	Year Ended December 31,
	2011			2010			2009
(Shares in thousands)
Senior Convertible Preferred Stock:
Balance at beginning and end of year		0			0			0

Common Stock:
Balance at beginning of year		21,278			21,124			21,097
Issued for employee stock plans		31			154			27

Balance at end of year		21,309			21,278			21,124

Treasury Stock:
Balance at beginning of year		(700	)		(669	)		(669	)
Shares repurchased		(6	)		(31	)		0

Balance at end of year		(706	)		(700	)		(669	)

Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data (Unaudited) [Abstract]

Selected Quarterly Financial Data

20. Selected Quarterly Financial Data (Unaudited)

The following is a summary of the quarterly results of operations for the years ended December 31, 2011 and 2010:


	Year Ended December 31, 2011
	1^stQuarter			2^ndQuarter			3^rdQuarter		4^thQuarter			Fiscal Year
(Dollars in millions, except per share amounts)
Statement of operations data:
Net sales	$	341.5		$	374.5		$	381.2	$	369.0		$	1,466.2
Operating profit		21.3			38.3			40.1		23.0			122.7
Income from continuing operations		9.2			20.4			22.5		5.4			57.5
Net income (loss)^(a)		9.0			19.9			22.7		(14.0	)		37.6
Net income (loss) attributable to Koppers^(a)		8.9			19.8			22.4		(14.2	)		36.9
Common stock data:
Earnings (loss) per common share attributable to Koppers common shareholders:
Basic –
Continuing operations	$	0.44		$	0.99		$	1.07	$	0.25		$	2.75
Discontinued operations^(a)		(0.01	)		(0.03	)		0.01		(0.94	)		(0.96	)

Earnings per basic common share	$	0.43		$	0.96		$	1.08	$	(0.69	)	$	1.79

Diluted –
Continuing operations	$	0.44		$	0.99		$	1.07	$	0.24		$	2.72
Discontinued operations^(a)		(0.01	)		(0.03	)		0.01		(0.93	)		(0.95	)

Earnings per diluted common share	$	0.43		$	0.96		$	1.08	$	(0.69	)	$	1.77

Dividends declared per common share	$	0.22		$	0.22		$	0.22	$	0.22		$	0.88
Price range of common stock:
High	$	42.88		$	46.14		$	39.23	$	36.53		$	46.14
Low		34.76			34.63			23.59		24.75			23.59

(a)

In the fourth quarter of 2011, the Company ceased manufacturing operations at its carbon black facility located in Kurnell, Australia. The costs related to this closure totaled $41.0 million in the fourth quarter of 2011. The results of operations of the carbon black facility have been reclassified to discontinued operations for all periods presented as run-off activities were completed in the first quarter of 2012.


	Year Ended December 31, 2010
	1^stQuarter			2^ndQuarter			3^rdQuarter		4^thQuarter		Fiscal Year
(Dollars in millions, except per share amounts)
Statement of operations data:
Net sales	$	259.2		$	316.5		$	321.7	$	293.1	$	1,190.5
Operating profit		17.0			32.8			33.1		15.2		98.1
Income from continuing operations		7.5			16.4			15.8		4.9		44.6
Net income		7.4			16.1			15.8		5.2		44.5
Net income attributable to Koppers		7.3			16.1			15.6		5.1		44.1
Common stock data:
Earnings (loss) per common share attributable to Koppers common shareholders:
Basic –
Continuing operations	$	0.37		$	0.79		$	0.76	$	0.23	$	2.14
Discontinued operations		(0.01	)		(0.01	)		0.00		0.01		0.00

Earnings per basic common share	$	0.36		$	0.78		$	0.76	$	0.24	$	2.14

Diluted –
Continuing operations	$	0.37		$	0.79		$	0.75	$	0.23	$	2.13
Discontinued operations		(0.01	)		(0.01	)		0.00		0.01		0.00

Earnings per diluted common share	$	0.36		$	0.78		$	0.75	$	0.24	$	2.13

Dividends declared per common share	$	0.22		$	0.22		$	0.22	$	0.22	$	0.88
Price range of common stock:
High	$	33.32		$	33.56		$	27.19	$	36.47	$	36.47
Low		25.58			22.42			19.77		25.69		19.77

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

KOPPERS HOLDINGS INC.

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2011, 2010 and 2009


	Balance at Beginning of Year		Increase (Decrease) to Expense			Net (Write- Offs) Recoveries			Currency Translation			Balance at End of Year
(Dollars in millions)
2011
Allowance for doubtful accounts	$	0.1	$	0.3		$	(0.1	)	$	0.0		$	0.3

Inventory obsolescence reserves	$	2.1	$	4.2		$	(4.9	)	$	0.0		$	1.4

Deferred tax valuation allowance	$	11.4	$	(1.2	)	$	0.0		$	0.0		$	10.2

2010
Allowance for doubtful accounts	$	0.5	$	(0.3	)	$	0.0		$	(0.1	)	$	0.1

Inventory obsolescence reserves	$	3.9	$	(1.7	)	$	0.0		$	(0.1	)	$	2.1

Deferred tax valuation allowance	$	11.2	$	0.2		$	0.0		$	0.0		$	11.4

2009
Allowance for doubtful accounts	$	0.5	$	0.0		$	(0.1	)	$	0.1		$	0.5

Inventory obsolescence reserves	$	1.5	$	2.3		$	(0.2	)	$	0.1		$	3.9

Deferred tax valuation allowance	$	8.2	$	3.0		$	0.0		$	0.0		$	11.2

Basis of Presentation and New Accounting Standards (Policies)	3 Months Ended
	Mar. 31, 2012
Basis of Presentation and New Accounting Standards [Abstract]
Comprehensive Income	In June 2011, the FASB issued Accounting Standards Update No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income (ASU 2011-05). The amendments in ASU 2011-05 require entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. ASU 2011-05 is effective for interim and annual periods beginning after December 15, 2011.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies [Abstract]

Basis of Presentation

Use of Estimates

Foreign Currency Translation

Revenue Recognition

Research & Development

Cash and Cash Equivalents

Cash and cash equivalents – Cash and cash equivalents include cash on hand and on deposit and investments in highly liquid investments with an original maturity of 90 days or less.

Accounts Receivable

Inventories

Property, Plant & Equipment

Goodwill & Other Intangible Assets

Deferred Income Taxes

Self-Insured Liabilities


	2011			2010
(Dollars in millions)
Self-insured liabilities at beginning of year	$	7.9		$	12.1
Expense		2.1			2.5
Reversal of self-insured liabilities		(1.0	)		(4.5	)
Cash expenditures		(1.6	)		(2.2	)

Self-insured liabilities at end of year	$	7.4		$	7.9

Derivative Financial Instruments

Asset Retirement Obligations

The Company recognizes asset retirement obligations for the removal and disposal of residues; dismantling of certain tanks required by governmental authorities; cleaning and dismantling costs for owned rail cars; cleaning costs for leased rail cars and barges; and site demolition.

The following table describes changes to the Company’s asset retirement obligation liabilities at December 31, 2011 and 2010:


	2011			2010
(Dollars in millions)
Asset retirement obligation at beginning of year	$	17.0		$	16.6
Accretion expense		1.1			1.3
Revision in estimated cash flows		6.3			1.5
Cash expenditures		(3.1	)		(2.4	)
Acquisitions		0.0			0.3
Currency translation		0.0			(0.3	)

Asset retirement obligation at end of year	$	21.3		$	17.0

In 2011, the Company incurred $6.2 million of expense related to the closure of its carbon black facility in Kurnell, Australia.

Litigation & Contingencies

Other Current Assets

Other current assets – Included in other current assets are prepaid expenses totaling $9.9 million and $7.6 million at December 31, 2011 and December 31, 2010, respectively.

Environmental Liabilities

Deferred Revenue from Extended Product Warranty Liabilities


	2011			2010
(Dollars in millions)
Deferred revenue at beginning of year	$	5.7		$	6.7
Revenue earned		(0.9	)		(1.0	)

Deferred revenue at end of year	$	4.8		$	5.7

Stock-Based Compensation

Discontinued operations (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Discontinued operations [Abstract]

Summary of Restructuring Activities and Related Reserves


	Severance and employee benefits			Environmental remediation		Inventory writedowns			Site demolition		Other			Total
(Dollars in millions)
Reserve at December 31, 2011	$	1.8		$	6.7	$	0.0		$	6.2	$	1.2		$	15.9
Charges		0.0			0.0		0.3			0.0		0.0			0.3
Costs charged against assets		0.0			0.0		(0.3	)		0.0		0.0			(0.3	)
Reversals		(0.1	)		0.0		0.0			0.0		0.0			(0.1	)
Cash paid		(0.9	)		0.0		0.0			0.0		(0.2	)		(1.1	)
Currency translation		0.0			0.2		0.0			0.2		0.0			0.4

Reserve at March 31, 2012	$	0.8		$	6.9	$	0.0		$	6.4	$	1.0		$	15.1


	Severance and employee benefits			Environmental remediation		Asset impairment			Inventory writedowns			Site demolition		Other		Total
(Dollars in millions)
Reserve at January 1, 2011	$	0.0		$	0.0	$	0.0		$	0.0		$	0.0	$	0.0	$	0.0
Charges		3.4			6.7		20.2			3.3			6.2		1.2		41.0
Costs charged against assets		0.0			0.0		(20.2	)		(3.3	)		0.0		0.0		(23.5	)
Cash paid		(1.6	)		0.0		0.0			0.0			0.0		0.0		(1.6	)

Reserve at December 31, 2011	$	1.8		$	6.7	$	0.0		$	0.0		$	6.2	$	1.2	$	15.9

Summary of Net Sales and Operating Profit from Discontinued Operations


	Three Months Ended March 31,
	2012		2011
Net sales	$	5.1	$	17.6
Operating profit		0.3		(0.5	)

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References + Details

Fair Value Measurements (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Fair Value Measurements [Abstract]

Schedule of Company's Financial Instruments


	March 31, 2012				December 31, 2011
	Fair Value		Carrying Value		Fair Value		Carrying Value
(Dollars in millions)
Financial assets:
Cash and cash equivalents, including restricted cash	$	42.6	$	42.6	$	54.1	$	54.1
Investments and other assets^(a)		1.3		1.3		1.3		1.3
Financial liabilities:
Long-term debt (including current portion)	$	340.3	$	314.3	$	324.4	$	302.1

(a)

Excludes equity method investments.


	December 31, 2011				December 31, 2010
	Fair Value		Carrying Value		Fair Value		Carrying Value
(Dollars in millions)
Financial assets:
Cash and cash equivalents	$	54.1	$	54.1	$	35.3	$	35.3
Investments and other assets^(a)		1.3		1.3		1.3		1.3
Financial liabilities:
Long-term debt (including current portion)	$	324.4	$	302.1	$	324.5	$	296.4

(a)

Excludes equity method investments.

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13467-108611

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

+ Details

Comprehensive Income and Equity (Tables)

3 Months Ended

Mar. 31, 2012

Comprehensive Income and Equity [Abstract]

Schedule of Comprehensive Income


	Three Months Ended March 31,
	2012			2011
(Dollars in millions)
Net income	$	15.9		$	9.0
Other comprehensive income (loss):
Change in currency translation adjustment		5.5			6.9
Change in unrecognized pension net loss, net of tax		1.3			0.9
Change in unrecognized transition asset, net of tax		(0.1	)		0.0

Total comprehensive income		22.6			16.8
Less: comprehensive income attributable to noncontrolling interests		0.3			0.2

Comprehensive income attributable to Koppers	$	22.3		$	16.6

Schedule of Change in Equity


(Dollars in millions)	Total Koppers Shareholders’ Equity’			Noncontrolling Interests		Total Equity
Balance at December 31, 2011	$	94.8		$	12.4	$	107.2
Net income		15.6			0.3		15.9
Issuance of common stock		0.6			0.0		0.6
Employee stock plans		1.6			0.0		1.6
Other comprehensive income		6.7			0.0		6.7
Dividends		(5.1	)		0.0		(5.1	)
Repurchases of common stock		(1.7	)		0.0		(1.7	)

Balance at March 31, 2012	$	112.5		$	12.7	$	125.2


(Dollars in millions)	Total Koppers Shareholders’ Equity’			Noncontrolling Interests		Total Equity
Balance at December 31, 2010	$	88.7		$	11.2	$	99.9
Net income		8.9			0.1		9.0
Issuance of common stock		0.2			0.0		0.2
Employee stock plans		0.9			0.0		0.9
Other comprehensive income		7.7			0.1		7.8
Dividends		(4.6	)		0.0		(4.6	)
Repurchases of common stock		(0.2	)		0.0		(0.2	)

Balance at March 31, 2011	$	101.6		$	11.4	$	113.0

Earnings And Dividends Per Common Share (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Earnings And Dividends Per Common Share [Abstract]

Schedule of Basic and Diluted Earnings per Common Share


	Three Months Ended March 31,
	2012		2011
(Dollars in millions, except share amounts, in thousands, and per share amounts)
Net income attributable to Koppers	$	15.6	$	8.9
Less: Income (loss) from discontinued operations		0.1	$	(0.2	)

Income from continuing operations attributable to Koppers	$	15.5	$	9.1

Weighted average common shares outstanding:
Basic		20,669		20,588
Effect of dilutive securities		234		136

Diluted		20,903		20,724

Earnings per common share – continuing operations:
Basic earnings per common share	$	0.74	$	0.44
Diluted earnings per common share		0.74		0.44

Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		181		95


	Year Ended December 31,
	2011			2010			2009
(Dollars in millions, except share amounts, in thousands, and per share amounts)
Net income attributable to Koppers	$	36.9		$	44.1		$	18.8
Less: discontinued operations		(19.9	)		(0.1	)		0.0

Income from continuing operations attributable to Koppers	$	56.8		$	44.2		$	18.8

Weighted average common shares outstanding:
Basic		20,599			20,543			20,446
Effect of dilutive securities		234			133			115

Diluted		20,833			20,676			20,561

Earnings per common share – continuing operations:
Basic earnings per common share	$	2.75		$	2.14		$	0.92
Diluted earnings per common share		2.72			2.13			0.91

Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		106			154			103

Stock-based Compensation (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Summary of Performance Stock Units


Performance Period	Minimum Shares		Target Shares		Maximum Shares
2011 – 2012		0		88,010		132,015
2012 – 2014		0		104,598		156,897


Performance Period	Minimum Shares		Target Shares		Maximum Shares
2009 – 2011		0		134,928		202,392
2010 – 2011		0		65,411		98,117
2011 – 2012		0		89,056		133,584

Summary of Non-Vested Stock Activity


	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at January 1, 2012		156,665			297,715			454,380		$	26.43
Granted		52,046			104,598			156,644		$	38.21
Credited from dividends		3,358			7,072			10,430		$	35.74
Performance stock unit adjustment		0			(40,112	)		(40,112	)	$	10.68
Vested		(69,243	)		(87,013	)		(156,256	)	$	16.42
Forfeited		(1,022	)		(1,523	)		(2,545	)	$	36.43
Non-vested at March 31, 2012		141,804			280,737			422,541		$	36.16


	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at January 1, 2011		121,397			257,002			378,399		$	23.31
Granted		60,501			93,115			153,616		$	40.41
Credited from dividends		3,627			7,693			11,320		$	27.31
Performance stock unit adjustment		0			(50,600	)		(50,600	)	$	38.92
Vested		(23,580	)		0			(23,580	)	$	38.92
Forfeited		(5,280	)		(9,495	)		(14,775	)	$	29.96

Non-vested at December 31, 2011		156,665			297,715			454,380		$	26.43

Stock Options Fair Value Assumptions


	February 2012 Grant			February 2011 Grant			August 2010 Grant			February 2010 Grant
Grant date price per share of option award	$	38.21		$	40.26		$	20.00		$	28.10
Expected dividend yield per share		2.75	%		2.50	%		2.50	%		2.50	%
Expected life in years		6.5			6.5			6.5			6.5
Expected volatility		55.06	%		60.00	%		62.00	%		62.00	%
Risk-free interest rate		1.34	%		3.02	%		3.05	%		3.05	%
Grant date fair value per share of option awards	$	15.82		$	19.28		$	9.82		$	13.81


	February 2011 Grant			August 2010 Grant			February 2010 Grant			February 2009 Grant
Grant date price per share of option award	$	40.26		$	20.00		$	28.10		$	15.26
Expected dividend yield per share		2.50	%		2.50	%		2.50	%		2.50	%
Expected life in years		6.5			6.5			6.5			6.5
Expected volatility		60.00	%		62.00	%		62.00	%		51.00	%
Risk-free interest rate		3.02	%		3.05	%		3.05	%		2.05	%
Grant date fair value per share of option awards	$	19.28		$	9.82		$	13.81		$	6.19

Stock Options Activity


	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2012		353,452		$	27.65
Granted		95,899		$	38.21
Exercised		(39,562	)	$	15.26
Outstanding at March 31, 2012		409,789		$	31.32		7.71	$	3.2
Exercisable at March 31, 2012		183,419			$25.39		6.04		$2.5


	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2011		291,591		$	24.63
Granted		73,910		$	40.26
Exercised		(7,150	)	$	29.97
Forfeited		(4,899	)	$	34.64

Outstanding at December 31, 2011		353,452		$	27.65		7.27	$	3.0

Exercisable at December 31, 2011		95,568		$	34.70		5.51	$	0.2

Stock-Based Compensation Expense


	Three Months Ended March 31,
	2012		2011
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	1.5	$	0.8
Less related income tax benefit		0.6		0.3

	$	0.9	$	0.5


	Year Ended December 31,
	2011		2010		2009
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	5.3	$	3.3	$	2.5
Less related income tax benefit		2.0		1.3		1.0

Decrease in net income attributable to Koppers	$	3.3	$	2.0	$	1.5

Segment Information (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Segment Information [Abstract]

Summary of Results of Segment Operations


	Three Months Ended March 31,
	2012			2011
(Dollars in millions)
Revenues from external customers:
Carbon Materials & Chemicals	$	249.5		$	218.6
Railroad & Utility Products		131.4			122.9

Total	$	380.9		$	341.5

Intersegment revenues:
Carbon Materials & Chemicals	$	30.0		$	27.5

Depreciation and amortization expense:
Carbon Materials & Chemicals	$	4.1		$	4.3
Railroad & Utility Products		2.7			2.1

Total	$	6.8		$	6.4

Operating profit:
Carbon Materials & Chemicals	$	20.5		$	14.1
Railroad & Utility Products		9.1			7.5
Corporate		(0.4	)		(0.3	)

Total	$	29.2		$	21.3


	Year Ended December 31,
	2011			2010			2009
(Dollars in millions)
Revenues from external customers:
Carbon Materials & Chemicals	$	943.1		$	740.6		$	606.0
Railroad & Utility Products		523.1			449.9			469.2

Total	$	1,466.2		$	1,190.5		$	1,075.2

Intersegment revenues:
Carbon Materials & Chemicals	$	95.2		$	97.2		$	91.5

Depreciation & amortization:
Carbon Materials & Chemicals	$	17.4		$	17.2		$	15.9
Railroad & Utility Products		9.5			9.4			7.3

Total	$	26.9		$	26.6		$	23.2

Operating profit:
Carbon Materials & Chemicals	$	89.1		$	76.7		$	57.3
Railroad & Utility Products		34.8			23.0			38.2
Corporate^(a)		(1.2	)		(1.6	)		(1.8	)

Total	$	122.7		$	98.1		$	93.7

Capital expenditures (including acquisitions):
Carbon Materials & Chemicals	$	23.0		$	44.9		$	10.7
Railroad & Utility Products		10.2			20.2			8.5
Corporate		0.6			0.3			1.0

Total	$	33.8		$	65.4		$	20.2

Summary of Assets and Goodwill by Segment


	March 31, 2012		December 31, 2011
(Dollars in millions)
Segment assets:
Carbon Materials & Chemicals	$	510.2	$	495.2
Railroad & Utility Products		185.1		164.6
All other		58.8		70.9

Total	$	754.1	$	730.7

Goodwill:
Carbon Materials & Chemicals	$	70.2	$	69.4
Railroad & Utility Products		2.8		2.7

Total	$	73.0	$	72.1


	December 31,
	2011		2010
(Dollars in millions)
Assets:
Carbon Materials & Chemicals	$	495.2	$	447.4
Railroad & Utility Products		164.6		154.8

Segment assets		659.8		602.2
Cash & cash equivalents		0.2		8.5
Income tax receivable		10.6		11.9
Deferred taxes		41.8		27.1
Deferred financing costs		8.2		9.1
Deferred charges		3.5		4.0
Other		6.6		6.4

Total	$	730.7	$	669.2

Goodwill:
Carbon Materials & Chemicals	$	69.4	$	69.6
Railroad & Utility Products		2.7		2.5

Total	$	72.1	$	72.1

Schedule of Revenues and Long-Lived Assets by Geographic Area


	Year		Revenue		Long-lived assets
(Dollars in millions)
United States		2011	$	787.5	$	161.6
		2010		672.5		157.1
		2009		649.1		149.1
Australasia		2011		276.6		58.7
		2010		221.9		79.8
		2009		190.2		73.4
Europe		2011		248.0		35.7
		2010		194.0		35.8
		2009		144.1		14.9
Other countries		2011		154.1		0.0
		2010		102.1		0.0
		2009		91.8		0.0

Total		2011	$	1,466.2	$	256.0
		2010	$	1,190.5	$	272.7
		2009	$	1,075.2	$	237.4

Schedule of Segment Revenues for Significant Product Lines


	Year Ended December 31,
	2011		2010		2009
(Dollars in millions)
Carbon Materials & Chemicals:
Carbon pitch	$	431.1	$	325.6	$	302.9
Creosote and carbon black feedstock		162.0		104.4		76.3
Phthalic anhydride		112.4		93.9		67.3
Naphthalene		72.3		68.0		49.8
Other products		165.3		148.7		109.7

		943.1		740.6		606.0
Railroad & Utility Products:
Railroad crossties		324.9		282.5		298.1
Utility poles		84.2		73.3		66.8
Creosote		52.7		57.9		60.6
Rail joint bars		24.7		0.1		0.0
Other products		36.6		36.1		43.7

		523.1		449.9		469.2

Total	$	1,466.2	$	1,190.05	$	1,075.2

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Summary of Income Tax Provision


	Years Ended December 31,
	2011			2010		2009
(Dollars in millions)
Current:
Federal	$	24.7		$	10.0	$	(21.3	)
State		1.1			0.4		0.1
Foreign		21.5			13.3		11.4

Total current tax provision (benefit)		47.3			23.7		(9.8	)
Deferred:
Federal		(6.7	)		4.1		22.7
State		0.1			0.3		(0.7	)
Foreign		(2.0	)		0.8		1.2

Total deferred tax provision		(8.6	)		5.2		23.2

Total income tax provision	$	38.7		$	28.9	$	13.4

Summary of Income Taxes Reconciled with the Federal Statutory Rates


	Years Ended December 31,
	2011			2010			2009
Federal income tax rate		35.0	%		35.0	%		35.0	%
State income taxes, net of federal tax benefit		0.7			0.7			(1.2	)
Foreign earnings taxed at different rates		1.4			2.4			4.9
Domestic production activities deduction		(1.3	)		(0.7	)		0.0
Non-deductible fines and penalties		0.2			0.0			1.1
Deferred tax adjustments		0.1			0.0			(0.9	)
Change in tax contingency reserves		3.8			0.2			0.3
Other		0.3			1.7			(0.7	)

		40.2	%		39.3	%		38.5	%

Summary of Deferred Tax Assets and Liabilities


	December 31,
	2011			2010
(Dollars in millions)
Deferred tax assets:
Pension and other postretirement benefits obligations	$	38.7		$	30.9
Reserves, including insurance, environmental and deferred revenue		29.8			12.0
Net operating loss benefit		11.2			10.6
Accrued employee compensation		10.7			8.6
Asset retirement obligations		5.1			4.9
Book/tax inventory accounting differences		1.6			1.8
Capital loss benefit		1.5			2.0
Tax credits		0.4			0.3
Excess tax basis on Koppers Australia assets		0.2			0.9
Other		2.4			4.1
Valuation allowance		(10.2	)		(11.4	)

Total deferred tax assets		91.4			64.7
Deferred tax liabilities:
Tax over book depreciation and amortization		27.6			23.1
Unremitted earnings of foreign subsidiaries		6.1			5.9
Tax/book inventory accounting differences		1.7			1.9
Other		5.5			4.3

Total deferred tax liabilities		40.9			35.2

Net deferred tax assets	$	50.5		$	29.5

Summary of Unrecognized Tax Benefits


	December 31,
	2011			2010			2009
(Dollars in millions)
Balance at beginning of year	$	6.5		$	4.0		$	4.0
Additions based on tax provisions related to the current year		4.0			0.4			0.5
Additions for tax provisions of prior years		0.0			2.6			0.0
Reductions as a result of a lapse of the applicable statute of limitations		(0.6	)		(0.5	)		(0.5	)

Balance at end of year	$	9.9		$	6.5		$	4.0

Inventories (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Inventories [Abstract]

Components of Inventories


	March 31, 2012		December 31, 2011
(Dollars in millions)
Raw materials	$	105.2	$	91.5
Work in process		22.1		20.1
Finished goods		99.4		95.1

		226.7		206.7
Less revaluation to LIFO		48.5		47.7

Net	$	178.2	$	159.0


	December 31,
	2011		2010
(Dollars in millions)
Raw materials	$	91.5	$	107.6
Work in process		20.1		7.6
Finished goods		95.1		95.0

		206.7		210.2
Less revaluation to LIFO		47.7		44.8

Net	$	159.0	$	165.4

Property, Plant and Equipment (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment


	March 31, 2012		December 31, 2011
(Dollars in millions)
Land	$	6.7	$	6.6
Buildings		35.1		34.7
Machinery and equipment		599.3		593.5

		641.1		634.8
Less accumulated depreciation		487.4		479.2

Net	$	153.7	$	155.6


	December 31,
	2011		2010
(Dollars in millions)
Land	$	6.6	$	7.6
Buildings		34.7		36.5
Machinery and equipment		593.5		605.5

		634.8		649.6
Less accumulated depreciation		479.2		481.4

Net	$	155.6	$	168.2

Pensions and Postretirement Benefit Plans (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Pensions and Postretirement Benefit Plans [Abstract]

Schedule of Net Benefit Cost


	Three Months Ended March 31,
	2012			2011
(Dollars in millions)
Service cost	$	0.9		$	0.8
Interest cost		2.8			2.9
Expected return on plan assets		(2.7	)		(2.8	)
Amortization of net loss		2.0			1.6
Amortization of transition asset		(0.1	)		(0.1	)

Net periodic benefit cost for defined benefit plans	$	2.9		$	2.4

Defined contribution plan expense	$	1.5		$	1.5
Other postretirement benefit plan expense		0.2			0.2
Multi-employer pension plan expense		0.2			0.2


	December 31,
	Pension Benefits									Other Benefits
	2011			2010			2009			2011			2010			2009
(Dollars in millions)
Components of net periodic benefit cost:
Service cost	$	3.3		$	3.1		$	2.8		$	0.2		$	0.2		$	0.2
Interest cost		11.1			11.4			10.8			0.6			0.7			0.8
Expected return on plan assets		(11.0	)		(9.9	)		(8.5	)		0.0			0.0			0.0
Amortization of prior service cost		0.1			0.2			0.2			(0.1	)		(0.1	)		(0.3	)
Amortization of net loss		6.3			5.2			6.3			0.0			0.0			0.0
Amortization of transition asset		(0.3	)		(0.3	)		(0.3	)		0.0			0.0			0.0
Settlements and curtailments		0.2			0.5			0.0			0.0			0.0			0.0

Net periodic benefit cost	$	9.7		$	10.2		$	11.3		$	0.7		$	0.8		$	0.7

Schedule of Change in the Funded Status of the Pension and Post-Retirement Plans


	December 31,
	Pension Benefits						Other Benefits
	2011			2010			2011			2010
(Dollars in millions)
Change in benefit obligation:
Benefit obligation at beginning of year	$	215.9		$	201.9		$	12.8		$	13.6
Service cost		3.3			3.1			0.1			0.2
Interest cost		11.2			11.4			0.6			0.7
Plan participants’ contributions		0.2			0.2			0.0			0.0
Actuarial losses (gains)		20.2			12.9			(0.5	)		(0.5	)
Settlements		(0.8	)		(2.4	)		0.0			0.0
Curtailments		0.0			(1.1	)		0.0			0.0
Currency translation		(0.3	)		(0.7	)		0.0			0.0
Benefits paid		(10.2	)		(9.4	)		(0.5	)		(1.2	)

Benefit obligation at end of year		239.5			215.9			12.5			12.8

Change in plan assets:
Fair value of plan assets at beginning of year		141.6			132.8			0.0			0.0
Actual return on plan assets		0.1			14.3			0.0			0.0
Employer contribution		15.9			6.3			0.5			1.2
Plan participants’ contributions		0.2			0.2			0.0			0.0
Settlements		(0.8	)		(2.4	)		0.0			0.0
Currency translation		(0.2	)		(0.2	)		0.0			0.0
Benefits paid		(10.2	)		(9.4	)		(0.5	)		(1.2	)

Fair value of plan assets at end of year		146.6			141.6			0.0			0.0

Funded status of the plan	$	(92.9	)	$	(74.3	)	$	(12.5	)	$	(12.8	)


Amounts recognized in the balance sheet consist of:
Noncurrent assets	$	0.3		$	0.9		$	0.0		$	0.0
Current liabilities		0.7			0.6			1.0			1.3
Noncurrent liabilities		92.5			74.6			11.5			11.5

Pension plans with benefit obligations in excess of plan assets:
Benefit obligation	$	231.5		$	208.1
Fair value of plan assets		138.3			132.9

Pension plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	$	224.1		$	201.6
Fair value of plan assets		138.3			132.9

Schedule of Projected Benefit Payments


	Pension Benefits		Other Benefits
(Dollars in millions)
2012	$	12.1	$	1.0
2013		10.8		0.9
2014		11.6		0.9
2015		11.9		0.9
2016		13.1		0.9
2017 – 2021		72.0		4.6

Schedule of Weighted-Average Assumptions


	December 31,
	Pension Benefits						Other Benefits
	2011			2010			2011			2010
Discount rate		4.55	%		5.28	%		4.37	%		5.09	%
Expected return on plan assets		7.68			7.65
Rate of compensation increase		3.09			3.10
Initial medical trend rate								7.80			8.00

Schedule of Weighted Average Asset Allocation for the Company's Pension Plans


	December 31,
	2011			2010
Equity securities		64	%		67	%
Debt securities		30			27
Other		6			6

		100	%		100	%

Schedule of Pension Plan Assets at Fair Value


	As of December 31, 2011
	Quoted prices in active markets for identical assets (Level 1)		Significant observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
(Dollars in millions)
U.S. equity securities	$	0.0	$	71.8	$	0.0	$	71.8
International equity securities		0.0		22.6		0.0		22.6
U.S. debt securities		0.0		22.0		0.0		22.0
International debt securities		0.0		22.4		0.0		22.4
Real estate and other investments		0.0		1.6		0.0		1.6
Cash and cash equivalents		0.0		6.2		0.0		6.2

	$	0.0	$	146.6	$	0.0	$	146.6


	As of December 31, 2010
	Quoted prices in active markets for identical assets (Level 1)		Significant observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
(Dollars in millions)
U.S. equity securities	$	0.0	$	70.3	$	0.0	$	70.3
International equity securities		0.0		25.3		0.0		25.3
U.S. debt securities		0.0		18.5		0.0		18.5
International debt securities		0.0		19.3		0.0		19.3
Real estate and other investments		0.0		1.6		0.0		1.6
Cash and cash equivalents		0.0		6.6		0.0		6.6

	$	0.0	$	141.6	$	0.0	$	141.6

Schedule of Health Care Cost Trend Rates


	1% Increase		1% Decrease
(Dollars in millions)
Increase (decrease) from change in health care cost trend rates:
Postretirement benefit expense	$	0.0	$	0.0
Postretirement benefit liability		0.3		(0.3	)

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4, 7, 16, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=6930749&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2410-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2439-114920

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2417-114920

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Debt (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Debt [Abstract]

Schedule of Debt


	Weighted Average Interest Rate			Maturity		March 31, 2012		December 31, 2011
(Dollars in millions)
Revolving Credit Facility		3.41	%		2015	$	18.5	$	6.4
Senior Notes		7⁷/8	%		2019		295.8		295.7

Total debt							314.3		302.1
Less short term debt and current maturities of long-term debt							0.0		0.0

Long-term debt						$	314.3	$	302.1


						December 31,
	Weighted Average Interest Rate			Maturity		2011		2010
(Dollars in millions, except interest rates)
Revolving Credit Facility		2.55	%		2015	$	6.4	$	0.0
Senior Notes		7⁷/8	%		2019		295.7		295.3
Other debt, including capital leases		0.0	%				0.0		1.1

Total debt							302.1		296.4
Less short-term debt and current maturities of long-term debt							0.0		1.0

Long-term debt (excluding current portion)						$	302.1	$	295.4

Schedule of Debt Maturities



(Dollars in millions)
2012	$	0.0
2013		0.0
2014		0.0
2015		6.4
2016		0.0
Thereafter		300.0

Total maturities		306.4
Future accretion on Senior Notes		(4.3	)

Total debt	$	302.1

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

+ Details

Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2012

Asset Retirement Obligations [Abstract]

Changes in Carrying Values of Asset Retirement Obligations


	March 31, 2012			December 31, 2011
(Dollars in millions)
Balance at beginning of year	$	21.3		$	17.0
Accretion expense		0.2			1.1
Revision in estimated cash flows, net		0.1			6.3
Expenses incurred		(0.4	)		(3.1	)
Currency translation		0.2			0.0

Balance at end of period	$	21.4		$	21.3

Deferred Revenue from Extended Product Warranty Liabilities (Tables)

3 Months Ended

Mar. 31, 2012

Deferred Revenue from Extended Product Warranty Liabilities [Abstract]

Summary of Changes to Deferred Revenue


	March 31, 2012			December 31, 2011
(Dollars in millions)
Balance at beginning of year	$	4.8		$	5.7
Revenue earned		(0.2	)		(0.9	)

Balance at end of period	$	4.6		$	4.8

Commitments and Contingent Liabilities (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Commitments and Contingent Liabilities [Abstract]

Changes in Accrued Liability for Legal Proceedings


	Year Ended December 31,
	2011			2010
(Dollars in millions)
Balance at beginning of year	$	3.0		$	0.0
Accrual of reserves		0.0			3.0
Cash expenditures		(3.0	)		0.0

Balance at end of year	$	0.0		$	3.0

Changes in Accrued Liability for Environmental Matters


	Period ended
	March 31, 2012			December 31, 2011
(Dollars in millions)
Balance at beginning of year	$	17.7		$	6.6
Expense		0.6			8.0
Reversal of reserves		(0.1	)		(1.6	)
Cash expenditures		(2.3	)		(2.4	)
Assumed remediation liability in exchange for cash		0.0			7.5
Currency translation		0.3			(0.4	)

Balance at end of year	$	16.2		$	17.7


	Year Ended December 31,
	2011			2010
(Dollars in millions)
Balance at beginning of year	$	6.6		$	10.7
Expense		8.0			1.2
Reversal of reserves		(1.6	)		(4.3	)
Cash expenditures		(2.4	)		(1.5	)
Assumed remediation liability in exchange for cash		7.5			0.0
Currency translation		(0.4	)		0.5

Balance at end of year	$	17.7		$	6.6

Subsidiary Guarantor Information for Koppers Inc. Senior Notes (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Subsidiary Guarantor Information for Koppers Inc. Senior Notes [Abstract]

Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	211.8		$	22.4	$	163.2	$	(16.5	)	$	380.9
Cost of sales including depreciation and amortization		0.0			189.4			16.3		143.0		(15.0	)		333.7
Selling, general and administrative		0.4			10.5			0.4		6.7		0.0			18.0

Operating profit (loss)		(0.4)			11.9			5.7		13.5		(1.5)			29.2
Other income (expense)		15.9			0.0			0.3		0.4		(15.9	)		0.7
Interest expense (income)		0.1			6.8			0.0		1.5		(1.5	)		6.9
Income taxes		(0.2	)		5.1			0.1		2.2		0.0			7.2

Income from continuing operations		15.6			0.0			5.9		10.2		(15.9	)		15.8
Discontinued operations		0.0			(0.1)			0.0		0.2		0.0			0.1
Noncontrolling interests		0.0			0.0			0.0		0.3		0.0			0.3

Net income attributable to Koppers	$	15.6		$	(0.1	)	$	5.9	$	10.1	$	(15.9	)	$	15.6

Comprehensive income attributable to Koppers	$	22.3		$	1.1		$	7.7	$	13.8	$	(22.6	)	$	22.3

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	189.2		$	18.9	$	145.1		$	(11.7	)	$	341.5
Cost of sales including depreciation and amortization		0.0			175.9			13.5		123.3			(10.2	)		302.5
Selling, general and administrative		0.3			9.6			0.5		7.3			0.0			17.7

Operating profit (loss)		(0.3	)		3.7			4.9		14.5			(1.5	)		21.3
Other income (expense)		9.0			0.0			0.0		0.0			(9.0	)		0.0
Interest expense (income)		(0.1	)		6.9			0.0		1.4			(1.3	)		6.9
Income taxes		(0.1	)		2.2			0.0		3.1			0.0			5.2

Income from continuing operations		8.9			(5.4	)		4.9		10.0			(9.2	)		9.2
Discontinued operations		0.0			0.1			0.0		(0.3	)		0.0			(0.2	)
Noncontrolling interests		0.0			0.0			0.0		0.1			0.0			0.1

Net income attributable to Koppers	$	8.9		$	(5.3	)	$	4.9	$	9.6		$	(9.2	)	$	8.9

Comprehensive income attributable to Koppers	$	16.6		$	(4.4	)	$	5.8	$	15.5		$	(16.9	)	$	16.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2011


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	854.1	$	72.6		$	585.2		$	(45.7	)	$	1,466.2
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6			496.8			(24.3	)		1,269.2
Selling, general and administrative		1.2			41.6		1.8			29.7			0.0			74.3

Operating profit (loss)		6.6			49.6		29.2			58.7			(21.4	)		122.7
Other income (expense)		29.9			0.3		0.0			0.4			(29.9	)		0.7
Interest expense (income)		0.0			27.5		(0.1	)		5.4			(5.6	)		27.2
Income taxes		(0.4	)		7.7		0.8			30.6			0.0			38.7

Income from continuing operations		36.9			14.7		28.5			23.1			(45.7	)		57.5
Discontinued operations		0.0			0.0		0.0			(19.9	)		0.0			(19.9	)
Noncontrolling interests		0.0			0.0		0.0			0.7			0.0			0.7

Net income attributable to Koppers	$	36.9		$	14.7	$	28.5		$	2.5		$	(45.7	)	$	36.9

Comprehensive income attributable to Koppers	$	18.9		$	1.1	$	28.0		$	(1.4	)	$	(27.7	)	$	18.9

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2010


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	721.2	$	45.8		$	462.3	$	(38.8	)	$	1,190.5
Cost of sales including depreciation and amortization		0.0			657.7		19.1			378.8		(25.6	)		1,030.0
Selling, general and administrative		1.6			32.2		3.3			25.3		0.0			62.4

Operating profit (loss)		(1.6	)		31.3		23.4			58.2		(13.2	)		98.1
Other income (expense)		45.0			0.2		(0.4	)		2.7		(45.0	)		2.5
Interest expense (income)		(0.2	)		27.9		0.0			4.4		(5.0	)		27.1
Income taxes		(0.5	)		1.5		12.2			15.7		0.0			28.9

Income from continuing operations		44.1			2.1		10.8			40.8		(53.2	)		44.6
Discontinued operations		0.0			0.0		(0.2	)		0.1		0.0			(0.1	)
Noncontrolling interests		0.0			0.0		0.0			0.4		0.0			0.4

Net income attributable to Koppers	$	44.1		$	2.1	$	10.6		$	40.5	$	(53.2	)	$	44.1

Comprehensive income attributable to Koppers	$	54.6		$	1.8	$	18.9		$	43.0	$	(63.7	)	$	54.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	709.1		$	33.0		$	373.1		$	(40.0	)	$	1,075.2
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		303.2			(16.2	)		924.2
Selling, general and administrative		1.8			28.8			3.0			23.7			0.0			57.3

Operating profit (loss)		(1.8	)		39.4			33.7			46.2			(23.8	)		93.7
Other income (expense)		40.2			0.5			(0.3	)		(0.4	)		(40.2	)		(0.2	)
Interest expense (income)		31.1			28.5			0.0			4.1			(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			11.9			0.0			13.4

Income from continuing operations		18.8			9.4			22.4			29.8			(59.0	)		21.4
Discontinued operations		0.0			(0.3	)		0.0			0.3			0.0			0.0
Noncontrolling interests		0.0			0.0			0.0			2.6			0.0			2.6

Net income attributable to Koppers	$	18.8		$	9.1		$	22.4		$	27.5		$	(59.0	)	$	18.8

Comprehensive income attributable to Koppers	$	43.5		$	12.2		$	35.0		$	36.5		$	(83.7	)	$	43.5

Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet

Condensed Consolidating Balance Sheet

March 31, 2012


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	42.6	$	0.0		$	42.6
Accounts receivable, net		5.8		113.1			301.3			100.2		(328.0	)		192.4
Inventories, net		0.0		99.0			0.0			79.3		(0.1	)		178.2
Deferred tax assets		0.0		10.9			(1.5	)		0.2		0.0			9.6
Other current assets		0.0		7.2			0.3			24.4		0.0			31.9

Total current assets		5.8		230.2			300.1			246.7		(328.1	)		454.7
Equity investments		111.7		77.1			26.5			4.2		(214.1	)		5.4
Property, plant and equipment, net		0.0		100.3			0.0			53.4		0.0			153.7
Goodwill		0.0		39.8			0.0			33.2		0.0			73.0
Deferred tax assets		0.0		41.2			(10.5	)		10.8		0.0			41.5
Other noncurrent assets		0.0		17.7			126.9			44.0		(162.8	)		25.8

Total assets	$	117.5	$	506.3		$	443.0		$	392.3	$	(705.0	)	$	754.1

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	353.4		$	15.3		$	55.5	$	(327.7	)	$	96.6
Accrued liabilities		4.9		30.2			(0.9	)		32.3		0.0			66.5

Total current liabilities		5.0		383.6			14.4			87.8		(327.7	)		163.1
Long-term debt		0.0		413.0			0.0			64.5		(163.2	)		314.3
Other long-term liabilities		0.0		116.6			2.5			32.4		0.0			151.5

Total liabilities		5.0		913.2			16.9			184.7		(490.9	)		628.9
Koppers shareholders’ equity		112.5		(406.9	)		426.1			194.9		(214.1	)		112.5
Noncontrolling interests		0.0		0.0			0.0			12.7		0.0			12.7

Total liabilities and equity	$	117.5	$	506.3		$	443.0		$	392.3	$	(705.0	)	$	754.1

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	54.1	$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			79.2		(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			84.2		0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.1		0.0			9.3
Other current assets		0.0		6.8			0.3			26.4		0.0			33.5

Total current assets		5.5		204.9			282.8			244.0		(309.8	)		427.4
Equity investments		93.9		77.1			26.3			3.9		(196.3	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			53.6		0.0			155.6
Goodwill		0.0		39.8			0.0			32.3		0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		11.1		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			44.4		(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.6		$	57.5	$	(309.8	)	$	102.1
Accrued liabilities		4.5		27.2			(0.6	)		37.4		0.0			68.3
Short-term debt and current portion of long-term debt		0.0		0.0			0.0			0.0		0.0			0.0

Total current liabilities		4.6		371.7			9.0			94.9		(309.8	)		170.4
Long-term debt		0.0		400.8			0.0			69.0		(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			32.0		0.0			151.0

Total liabilities		4.6		889.0			11.5			195.9		(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			181.0		(196.3	)		94.8
Noncontrolling interests		0.0		0.0			0.0			12.4		0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	54.1	$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			79.2		(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			84.2		0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.1		0.0			9.3
Other current assets		0.0		6.8			0.3			26.4		0.0			33.5

Total current assets		5.5		204.9			282.8			244.0		(309.8	)		427.4
Equity investments		93.9		77.1			26.3			3.9		(196.3	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			53.6		0.0			155.6
Goodwill		0.0		39.8			0.0			32.3		0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		11.1		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			44.4		(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.6		$	57.5	$	(309.8	)	$	102.1
Accrued liabilities		4.5		27.2			(0.6	)		37.4		0.0			68.3
Short-term debt and current portion of long-term debt		0.0		0.0			0.0			0.0		0.0			0.0

Total current liabilities		4.6		371.7			9.0			94.9		(309.8	)		170.4
Long-term debt		0.0		400.8			0.0			69.0		(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			32.0		0.0			151.0

Total liabilities		4.6		889.0			11.5			195.9		(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			181.0		(196.3	)		94.8
Noncontrolling interests		0.0		0.0			0.0			12.4		0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	389.3	$	(673.8	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2010


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	8.4		$	0.0		$	26.9	$	0.0		$	35.3
S-T investments & restricted cash		0.0		0.0			0.0			0.0		0.0			0.0
Accounts receivable, net		16.6		80.3			460.9			107.2		(524.2	)		140.8
Inventories, net		0.0		78.3			1.2			85.9		0.0			165.4
Deferred tax assets		0.0		7.4			(1.5	)		0.0		0.0			5.9
Other current assets		0.0		6.9			0.3			15.8		0.0			23.0

Total current assets		16.6		181.3			460.9			235.8		(524.2	)		370.4
Equity investments		76.7		77.1			26.2			3.8		(179.1	)		4.7
Property, plant and equipment, net		0.0		94.7			0.0			73.5		0.0			168.2
Goodwill		0.0		39.5			0.0			32.6		0.0			72.1
Deferred tax assets		0.0		65.4			(43.8	)		4.5		0.0			26.1
Other noncurrent assets		0.0		21.6			0.0			6.2		(0.1	)		27.7

Total assets	$	93.3	$	479.6		$	443.3		$	356.4	$	(703.4	)	$	669.2

LIABILITIES AND EQUITY
Accounts payable	$	0.0	$	492.5		$	15.1		$	104.5	$	(524.2	)	$	87.9
Accrued liabilities		4.6		(6.3	)		34.8			27.4		0.0			60.5
Short-term debt and current portion of long-term debt		0.0		0.1			0.0			0.9		0.0			1.0

Total current liabilities		4.6		486.3			49.9			132.8		(524.2	)		149.4
Long-term debt		0.0		295.4			0.0			0.0		0.0			295.4
Other long-term liabilities		0.0		99.6			3.0			21.9		0.0			124.5

Total liabilities		4.6		881.3			52.9			154.7		(524.2	)		569.3
Koppers shareholders’ equity		88.7		(401.7	)		390.4			190.5		(179.2	)		88.7
Noncontrolling interests		0.0		0.0			0.0			11.2		0.0			11.2

Total liabilities and equity	$	93.3	$	479.6		$	443.3		$	356.4	$	(703.4	)	$	669.2

Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	5.6		$	(9.4	)	$	0.0	$	(12.0	)	$	0.0	$	(15.8	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(2.7	)		0.0		(0.7	)		0.0		(3.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.2			0.0		0.2

Net cash provided by (used in) investing activities		0.0			(2.7	)		0.0		(0.5	)		0.0		(3.2	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			12.1			0.0		0.0			0.0		12.1
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0		(4.5	)
Stock issued (repurchased)		(1.1	)		0.0			0.0		0.0			0.0		(1.1	)

Net cash provided by (used in) financing activities		(5.6)			12.1			0.0		0.0			0.0		6.5
Effect of exchange rates on cash		0.0			0.0			0.0		1.0			0.0		1.0

Net increase (decrease) in cash and cash equivalents		0.0			0.0			0.0		(11.5)			0.0		(11.5)
Cash and cash equivalents at beginning of year		0.0			0.0			0.0		54.1			0.0		54.1

Cash and cash equivalents at end of period		$0.0			$0.0			$0.0		$42.6			$0.0		$42.6

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	4.6		$	(28.7	)	$	0.0	$	14.6		$	0.0	$	(9.5	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(3.6	)		0.0		(1.4	)		0.0		(5.0	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.0			0.0		0.0

Net cash provided by (used in) investing activities		0.0			(3.6	)		0.0		(1.4	)		0.0		(5.0	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(0.1	)		24.5			0.0		(0.8	)		0.0		23.6
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0		(0.5	)
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0		(4.5	)
Stock issued (repurchased)		0.0			0.0			0.0		0.0			0.0		0.0

Net cash provided by (used in) financing activities		(4.6	)		24.0			0.0		(0.8	)		0.0		18.6
Effect of exchange rates on cash		0.0			(0.1	)		0.0		1.2			0.0		1.1

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		13.6			0.0		5.2
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		26.9			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	40.5		$	0.0	$	40.5

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.1		$	9.5			$0.0	$	49.3			$0.0	$	76.9
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(24.5	)		0.0		(9.3	)		0.0		(33.8	)
Loan to related party		0.0			0.0			0.0		(11.7	)		0.0		(11.7	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.7			0.0		0.1			0.0		0.8

Net cash (used in) investing activities		0.0			(23.8	)		0.0		(20.9	)		0.0		(44.7	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			6.3			0.0		(0.9	)		0.0		5.4
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0		(0.5	)
Dividends paid		(18.1	)		0.0			0.0		(0.1	)		0.0		(18.2	)

Net cash provided by (used in) financing activities		(18.1	)		5.8			0.0		(1.0	)		0.0		(13.3	)
Effect of exchange rates on cash		0.0			0.1			0.0		(0.2	)		0.0		(0.1	)

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		27.2			0.0		18.8
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		26.9			0.0		35.3

Cash and cash equivalents at end of period		0.0		$	0.0			0.0	$	54.1			0.0	$	54.1

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2010


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.7		$	75.2		$	0.0	$	15.9		$	(4.5	)	$	105.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(35.0	)		0.0		(30.4	)		0.0			(65.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.2			0.0		1.8			0.0			2.0

Net cash (used in) investing activities		0.0			(34.8	)		0.0		(28.6	)		0.0			(63.4	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			(40.2	)		0.0		0.0			0.0			(40.2	)
Deferred financing costs		0.0			(0.4	)		0.0		0.0			0.0			(0.4	)
Dividends paid		(18.1	)		(4.5	)		0.0		(5.0	)		4.5			(23.1	)
Stock issued (repurchased)		(0.8	)		0.2			0.0		0.0			0.0			(0.6	)

Net cash provided by (used in) financing activities		(18.9	)		(44.9	)		0.0		(5.0	)		4.5			(64.3	)
Effect of exchange rates on cash		0.0			0.0			0.0		(0.7	)		0.0			(0.7	)

Net increase (decrease) in cash and cash equivalents		(0.2	)		(4.5	)		0.0		(18.4	)		0.0			(23.1	)
Cash and cash equivalents at beginning of year		0.2			12.9			0.0		45.3			0.0			58.4

Cash and cash equivalents at end of period		0.0		$	8.4			0.0	$	26.9			0.0		$	35.3

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	231.8		$	90.7		$	0.0	$	22.5		$	(232.7	)	$	112.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(15.0	)		0.0		(5.2	)		0.0			(20.2	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			(0.7	)		0.0		0.1			0.0			(0.6	)

Net cash (used in) investing activities		0.0			(15.7	)		0.0		(5.1	)		0.0			(20.8	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(213.6	)		142.8			0.0		0.0			0.0			(70.8	)
Deferred financing costs		0.0			(8.1	)		0.0		0.0			0.0			(8.1	)
Dividends paid		(18.0	)		(232.7	)		0.0		0.0			232.7			(18.0	)

Net cash provided by (used in) financing activities		(231.6	)		(98.0	)		0.0		0.0			232.7			(96.9	)
Effect of exchange rates on cash		0.0			(1.6	)		0.0		2.3			0.0			0.7

Net increase (decrease) in cash and cash equivalents		0.2			(24.6	)		0.0		19.7			0.0			(4.7	)
Cash and cash equivalents at beginning of year		0.0			37.5			0.0		25.6			0.0			63.1

Cash and cash equivalents at end of period	$	0.2		$	12.9		$	0.0	$	45.3		$	0.0		$	58.4

Subsidiary Guarantor Information for Shelf Registration (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Subsidiary Guarantor Information for Shelf Registration [Abstract]

Condensed Consolidating Statement of Income

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	211.8		$	22.4	$	52.1	$	113.1	$	(18.5	)	$	380.9
Cost of sales including depreciation and amortization		0.0			189.4			16.3		41.2		103.7		(16.9	)		333.7
Selling, general and administrative		0.4			10.5			0.4		2.5		4.2		0.0			18.0

Operating profit (loss)		(0.4	)		11.9			5.7		8.4		5.2		(1.6	)		29.2
Other income (expense)		15.9			0.0			0.3		0.0		0.4		(15.9	)		0.7
Interest expense (income)		0.1			6.8			0.0		1.1		0.5		(1.6	)		6.9
Income taxes		(0.2	)		5.1			0.1		2.0		0.2		0.0			7.2

Income from continuing operations		15.6			0.0			5.9		5.3		4.9		(15.9	)		15.8
Discontinued operations		0.0			(0.1	)		0.0		0.2		0.0		0.0			0.1
Noncontrolling interests		0.0			0.0			0.0		0.0		0.3		0.0			0.3

Net income attributable to Koppers	$	15.6		$	(0.1	)	$	5.9	$	5.5	$	4.6	$	(15.9	)	$	15.6

Comprehensive income attributable to Koppers	$	22.3		$	1.1		$	7.7	$	8.9	$	5.8	$	(23.5	)	$	22.3

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	189.2		$	18.9	$	90.2		$	56.1	$	(12.9	)	$	341.5
Cost of sales including depreciation and amortization		0.0			175.9			13.6		73.5			50.4		(10.9	)		302.5
Selling, general and administrative		0.3			9.6			0.5		5.1			2.2		0.0			17.7

Operating profit (loss)		(0.3	)		3.7			4.8		11.6			3.5		(2.0	)		21.3
Other income (expense)		9.0			0.0			0.0		(0.1	)		0.1		(9.0	)		0.0
Interest expense (income)		(0.1	)		6.9			0.0		1.3			0.6		(1.8	)		6.9
Income taxes		(0.1	)		2.2			0.0		2.9			0.2		0.0			5.2

Income from continuing operations		8.9			(5.4	)		4.8		7.3			2.8		(9.2	)		9.2
Discontinued operations		0.0			0.1			0.0		(0.3	)		0.0		0.0			(0.2	)
Noncontrolling interests		0.0			0.0			0.0		0.0			0.1		0.0			0.1

Net income attributable to Koppers	$	8.9		$	(5.3	)	$	4.8	$	7.0		$	2.7	$	(9.2	)	$	8.9

Comprehensive income attributable to Koppers	$	16.6		$	(4.4	)	$	5.7	$	13.0		$	3.6	$	(17.9	)	$	16.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2011


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	854.1	$	72.6	$	358.6		$	264.6	$	(83.7	)	$	1,466.2
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6		292.4			220.7		(40.6	)		1,269.2
Selling, general and administrative		1.2			41.6		1.8		19.1			10.6		0.0			74.3

Operating profit (loss)		6.6			49.6		29.2		47.1			33.3		(43.1	)		122.7
Other income (expense)		29.9			0.3		0.0		(0.2	)		0.6		(29.9	)		0.7
Interest expense (income)		0.0			27.5		0.0		5.3			1.1		(6.7	)		27.2
Income taxes		(0.4	)		7.7		0.8		23.5			7.1		0.0			38.7

Income from continuing operations		36.9			14.7		28.4		18.1			25.7		(66.3	)		57.5
Discontinued operations		0.0			0.0		0.0		(19.9	)		0.0		0.0			(19.9	)
Noncontrolling interests		0.0			0.0		0.0		0.0			0.7		0.0			0.7

Net income attributable to Koppers	$	36.9		$	14.7	$	28.4	$	(1.8	)	$	25.0	$	(66.3	)	$	36.9

Comprehensive income attributable to Koppers	$	18.9		$	1.1	$	27.9	$	(3.1	)	$	22.0	$	(47.9	)	$	18.9

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2010


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	721.2	$	45.8		$	311.7	$	156.1	$	(44.3	)	$	1,190.5
Cost of sales including depreciation and amortization		0.0			657.7		19.3			242.0		140.4		(29.4	)		1,030.0
Selling, general and administrative		1.6			32.2		3.3			18.6		6.7		0.0			62.4

Operating profit (loss)		(1.6	)		31.3		23.2			51.1		9.0		(14.9	)		98.1
Other income (expense)		45.0			0.2		(0.4	)		2.3		0.4		(45.0	)		2.5
Interest expense (income)		(0.2	)		27.9		(0.1	)		5.2		1.0		(6.7	)		27.1
Income taxes		(0.5	)		1.5		12.2			13.2		2.5		0.0			28.9

Income from continuing operations		44.1			2.1		10.7			35.0		5.9		(53.2	)		44.6
Discontinued operations		0.0			0.0		(0.2	)		0.1		0.0		0.0			(0.1	)
Noncontrolling interests		0.0			0.0		0.0			0.0		0.4		0.0			0.4

Net income attributable to Koppers	$	44.1		$	2.1	$	10.5		$	35.1	$	5.5	$	(53.2	)	$	44.1

Comprehensive income attributable to Koppers	$	54.6		$	1.8	$	18.8		$	39.5	$	5.7	$	(65.8	)	$	54.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	709.1		$	33.0		$	306.4	$	79.3		$	(52.6	)	$	1,075.2
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		248.8		67.0			(28.8	)		924.2
Selling, general and administrative		1.8			28.8			3.0			19.7		4.0			0.0			57.3

Operating profit (loss)		(1.8	)		39.4			33.7			37.9		8.3			(23.8	)		93.7
Other income (expense)		40.2			0.5			(0.3	)		0.9		(1.3	)		(40.2	)		(0.2	)
Interest expense (income)		31.1			28.5			0.0			4.2		(0.1	)		(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			9.7		2.2			0.0			13.4

Income from continuing operations		18.8			9.4			22.4			24.9		4.9			(59.0	)		21.4
Discontinued operations		0.0			(0.3	)		0.0			0.3		0.0			0.0			0.0
Noncontrolling interests		0.0			0.0			0.0			0.0		2.6			0.0			2.6

Net income attributable to Koppers	$	18.8		$	9.1		$	22.4		$	25.2	$	2.3		$	(59.0	)	$	18.8

Comprehensive income attributable to Koppers	$	43.5		$	12.2		$	35.0		$	39.1	$	1.4		$	(87.7	)	$	43.5

Condensed Consolidating Balance Sheet

March 31, 2012


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	11.3	$	31.3		$	0.0		$	42.6
Accounts receivable, net		5.8		113.1			300.8			86.1		75.2			(388.6	)		192.4
Inventories, net		0.0		99.0			0.0			40.8		38.5			(0.1	)		178.2
Deferred tax assets		0.0		10.9			(1.5	)		0.0		0.2			0.0			9.6
Other current assets		0.0		7.2			0.3			7.4		17.0			0.0			31.9

Total current assets		5.8		230.2			299.6			145.6		162.2			(388.7	)		454.7
Equity investments		111.7		77.1			26.5			19.8		14.1			(243.8	)		5.4
Property, plant and equipment, net		0.0		100.3			0.0			26.6		26.8			0.0			153.7
Goodwill		0.0		39.8			0.0			26.0		7.2			0.0			73.0
Deferred tax assets		0.0		41.2			(10.5	)		12.4		(1.6	)		0.0			41.5
Other noncurrent assets		0.0		17.7			126.8			20.2		40.3			(179.2	)		25.8

Total assets	$	117.5	$	506.3		$	442.4		$	250.6	$	249.0		$	(811.7	)	$	754.1

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	353.4		$	14.9		$	19.6	$	96.8		$	(388.2	)	$	96.6
Accrued liabilities		4.9		30.2			(0.9	)		24.6		7.7			0.0			66.5

Total current liabilities		5.0		383.6			14.0			44.2		104.5			(388.2	)		163.1
Long-term debt		0.0		413.0			0.0			64.5		16.4			(179.6	)		314.3
Other long-term liabilities		0.0		116.6			2.6			20.3		12.1			(0.1	)		151.5

Total liabilities		5.0		913.2			16.6			129.0		133.0			(567.9	)		628.9
Koppers shareholders’ equity		112.5		(406.9	)		425.8			121.6		103.3			(243.8	)		112.5
Noncontrolling interests		0.0		0.0			0.0			0.0		12.7			0.0			12.7

Total liabilities and equity	$	117.5	$	506.3		$	442.4		$	250.6	$	249.0		$	(811.7	)	$	754.1

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	28.4	$	25.7		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			283.5			70.7		54.1			(354.9	)		171.5
Inventories, net		0.0		74.8			0.0			49.0		35.2			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			8.7		17.7			0.0			33.5

Total current assets		5.5		204.9			282.3			156.8		132.8			(354.9	)		427.4
Equity investments		93.9		77.1			26.3			19.3		13.5			(225.2	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			26.5		27.1			0.0			155.6
Goodwill		0.0		39.8			0.0			25.2		7.1			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.1		(1.0	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.2			15.7		40.9			(179.8	)		26.4

Total assets	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.5		$	28.6	$	74.3		$	(354.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.9	)		31.7		5.8			0.0			68.3

Total current liabilities		4.6		371.7			8.6			60.3		80.1			(354.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		18.5			(179.9	)		302.1
Other long-term liabilities		0.0		116.5			2.5			19.9		12.1			0.0			151.0

Total liabilities		4.6		889.0			11.1			142.9		110.7			(534.8	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.2			112.7		97.3			(225.1	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	28.4	$	25.7		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			283.5			70.7		54.1			(354.9	)		171.5
Inventories, net		0.0		74.8			0.0			49.0		35.2			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			8.7		17.7			0.0			33.5

Total current assets		5.5		204.9			282.3			156.8		132.8			(354.9	)		427.4
Equity investments		93.9		77.1			26.3			19.3		13.5			(225.2	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			26.5		27.1			0.0			155.6
Goodwill		0.0		39.8			0.0			25.2		7.1			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.1		(1.0	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.2			15.7		40.9			(179.8	)		26.4

Total assets	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.5		$	28.6	$	74.3		$	(354.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.9	)		31.7		5.8			0.0			68.3

Total current liabilities		4.6		371.7			8.6			60.3		80.1			(354.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		18.5			(179.9	)		302.1
Other long-term liabilities		0.0		116.5			2.5			19.9		12.1			0.0			151.0

Total liabilities		4.6		889.0			11.1			142.9		110.7			(534.8	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.2			112.7		97.3			(225.1	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.3		$	255.6	$	220.4		$	(759.9	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2010


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	8.4		$	0.0		$	14.7	$	12.2		$	0.0		$	35.3
S-T investments & restricted cash		0.0		0.0			0.0			0.0		0.0			0.0			0.0
Accounts receivable, net		16.6		80.3			457.4			81.3		67.2			(562.0	)		140.8
Inventories, net		0.0		78.3			1.2			71.3		14.6			0.0			165.4
Deferred tax assets		0.0		7.4			(1.5	)		0.0		0.0			0.0			5.9
Other current assets		0.0		6.9			0.3			8.8		7.0			0.0			23.0

Total current assets		16.6		181.3			457.4			176.1		101.0			(562.0	)		370.4
Equity investments		76.7		77.1			26.2			19.4		13.7			(208.4	)		4.7
Property, plant and equipment, net		0.0		94.7			0.0			46.9		26.6			0.0			168.2
Goodwill		0.0		39.5			0.0			25.4		7.2			0.0			72.1
Deferred tax assets		0.0		65.4			(43.8	)		5.3		(0.8	)		0.0			26.1
Other noncurrent assets		0.0		21.6			0.0			0.9		5.1			0.1			27.7

Total assets	$	93.3	$	479.6		$	439.8		$	274.0	$	152.8		$	(770.3	)	$	669.2

LIABILITIES AND EQUITY
Accounts payable	$	0.0	$	492.5		$	11.8		$	95.9	$	49.7		$	(562.0	)	$	87.9
Accrued liabilities		4.6		(6.3	)		34.8			20.4		7.0			0.0			60.5
Short-term debt and current portion of long-term debt		0.0		0.1			0.0			0.0		0.9			0.0			1.0

Total current liabilities		4.6		486.3			46.6			116.3		57.6			(562.0	)		149.4
Long-term debt		0.0		295.4			0.0			0.0		0.0			0.0			295.4
Other long-term liabilities		0.0		99.6			2.9			13.3		8.7			0.0			124.5

Total liabilities		4.6		881.3			49.5			129.6		66.3			(562.0	)		569.3
Koppers shareholders’ equity		88.7		(401.7	)		390.3			144.4		75.3			(208.3	)		88.7
Noncontrolling interests		0.0		0.0			0.0			0.0		11.2			0.0			11.2

Total liabilities and equity	$	93.3	$	479.6		$	439.8		$	274.0	$	152.8		$	(770.3	)	$	669.2

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	5.6		$	(9.4	)	$	0.0	$	(19.4	)	$	7.4		$	0.0	$	(15.8	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(2.7	)		0.0		(0.6	)		(0.1	)		0.0		(3.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.2			0.0			0.0		0.2

Net cash provided by (used in) investing activities		0.0			(2.7	)		0.0		(0.4	)		(0.1	)		0.0		(3.2	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			12.1			0.0		0.0			0.0			0.0		12.1
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		(1.1	)		0.0			0.0		0.0			0.0			0.0		(1.1	)

Net cash provided by (used in) financing activities		(5.6	)		12.1			0.0		0.0			0.0			0.0		6.5
Effect of exchange rates on cash		0.0			0.0			0.0		2.7			(1.7	)		0.0		1.0

Net increase (decrease) in cash and cash equivalents		0.0			0.0			0.0		(17.1	)		5.6			0.0		(11.5	)
Cash and cash equivalents at beginning of year		0.0			0.0			0.0		28.4			25.7			0.0		54.1

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	11.3		$	31.3		$	0.0	$	42.6

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	4.6		$	(28.7	)	$	0.0	$	12.1		$	2.5		$	0.0	$	(9.5	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(3.6	)		0.0		(1.1	)		(0.3	)		0.0		(5.0	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) investing activities		0.0			(3.6	)		0.0		(1.1	)		(0.3	)		0.0		(5.0	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(0.1	)		24.5			0.0		0.0			(0.8	)		0.0		23.6
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) financing activities		(4.6	)		24.0			0.0		0.0			(0.8	)		0.0		18.6
Effect of exchange rates on cash		0.0			(0.1	)		0.0		3.1			(1.9	)		0.0		1.1

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		14.1			(0.5	)		0.0		5.2
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		14.7			12.2			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	28.8		$	11.7		$	0.0	$	40.5

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.1		$	9.5		$	0.0	$	20.5		$	28.8		$	0.0	$	76.9
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(24.5	)		0.0		(6.2	)		(3.1	)		0.0		(33.8	)
Loan to related party		0.0			0.0			0.0		0.0			(11.7	)		0.0		(11.7	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.7			0.0		0.1			0.0			0.0		0.8

Net cash (used in) investing activities		0.0			(23.8	)		0.0		(6.1	)		(14.8	)		0.0		(44.7	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			6.3			0.0		0.0			(0.9	)		0.0		5.4
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(18.1	)		0.0			0.0		0.0			(0.1	)		0.0		(18.2	)

Net cash provided by (used in) financing activities		(18.1	)		5.8			0.0		0.0			(1.0	)		0.0		(13.3	)
Effect of exchange rates on cash		0.0			0.1			0.0		(0.7	)		0.5			0.0		(0.1	)

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		13.7			13.5			0.0		18.8
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		14.7			12.2			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	28.4		$	25.7		$	0.0	$	54.1

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2010


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.7		$	75.2		$	0.0	$	(15.3	)	$	31.2		$	(4.5	)	$	105.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(35.0	)		0.0		(7.0	)		(23.4	)		0.0			(65.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.2			0.0		1.7			0.1			0.0			2.0

Net cash (used in) investing activities		0.0			(34.8	)		0.0		(5.3	)		(23.3	)		0.0			(63.4	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			(40.2	)		0.0		0.0			0.0			0.0			(40.2	)
Deferred financing costs		0.0			(0.4	)		0.0		0.0			0.0			0.0			(0.4	)
Dividends paid		(18.1	)		(4.5	)		0.0		0.0			(5.0	)		4.5			(23.1	)
Stock issued (repurchased)		(0.8	)		0.2			0.0		0.0			0.0			0.0			(0.6	)

Net cash provided by (used in) financing activities		(18.9	)		(44.9	)		0.0		0.0			(5.0	)		4.5			(64.3	)
Effect of exchange rates on cash		0.0			0.0			0.0		(1.6	)		0.9			0.0			(0.7	)

Net increase (decrease) in cash and cash equivalents		(0.2	)		(4.5	)		0.0		(22.2	)		3.8			0.0			(23.1	)
Cash and cash equivalents at beginning of year		0.2			12.9			0.0		36.9			8.4			0.0			58.4

Cash and cash equivalents at end of period	$	0.0		$	8.4		$	0.0	$	14.7		$	12.2		$	0.0		$	35.3

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	231.8		$	90.7		$	0.0	$	19.5		$	3.0		$	(232.7	)	$	112.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(15.0	)		0.0		(3.7	)		(1.5	)		0.0			(20.2	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			(0.7	)		0.0		0.1			0.0			0.0			(0.6	)

Net cash (used in) investing activities		0.0			(15.7	)		0.0		(3.6	)		(1.5	)		0.0			(20.8	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(213.6	)		142.8			0.0		0.0			0.0			0.0			(70.8	)
Deferred financing costs		0.0			(8.1	)		0.0		0.0			0.0			0.0			(8.1	)
Dividends paid		(18.0	)		(232.7	)		0.0		0.0			0.0			232.7			(18.0	)

Net cash provided by (used in) financing activities		(231.6	)		(98.0	)		0.0		0.0			0.0			232.7			(96.9	)
Effect of exchange rates on cash		0.0			(1.6	)		0.0		2.3			0.0			0.0			0.7

Net increase (decrease) in cash and cash equivalents		0.2			(24.6	)		0.0		18.2			1.5			0.0			(4.7	)
Cash and cash equivalents at beginning of year		0.0			37.5			0.0		18.7			6.9			0.0			63.1

Cash and cash equivalents at end of period	$	0.2		$	12.9		$	0.0	$	36.9		$	8.4		$	0.0		$	58.4

Subsequent Events (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Subsequent Events [Abstract]

Condensed Consolidating Statement of Income

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	211.8		$	22.4	$	124.4	$	38.8	$	(16.5	)	$	380.9
Cost of sales including depreciation and amortization		0.0			189.5			16.3		106.5		36.4		(15.0	)		333.7
Selling, general and administrative		0.4			10.5			0.4		5.8		0.9		0.0			18.0

Operating profit (loss)		(0.4	)		11.8			5.7		12.1		1.5		(1.5	)		29.2
Other income (expense)		15.9			0.0			0.3		0.0		0.4		(15.9	)		0.7
Interest expense (income)		0.1			6.7			0.0		1.0		0.6		(1.5	)		6.9
Income taxes		(0.2	)		5.1			0.1		2.0		0.2		0.0			7.2

Income from continuing operations		15.6			0.0			5.9		9.1		1.1		(15.9	)		15.8
Discontinued operations		0.0			(0.1	)		0.0		0.2		0.0		0.0			0.1
Noncontrolling interests		0.0			0.0			0.0		0.0		0.3		0.0			0.3

Net income attributable to Koppers	$	15.6		$	(0.1	)	$	5.9	$	9.3	$	0.8	$	(15.9	)	$	15.6

Comprehensive income attributable to Koppers	$	22.3		$	1.1		$	7.7	$	13.5	$	0.9	$	(23.2	)	$	22.3

Condensed Consolidating Statement of Comprehensive Income

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	189.2		$	18.9	$	108.8		$	36.3	$	(11.7	)	$	341.5
Cost of sales including depreciation and amortization		0.0			175.9			13.5		89.4			33.9		(10.2	)		302.5
Selling, general and administrative		0.3			9.6			0.5		6.4			0.9		0.0			17.7

Operating profit (loss)		(0.3	)		3.7			4.9		13.0			1.5		(1.5	)		21.3
Other income (expense)		9.0			0.0			0.0		(0.1	)		0.1		(9.0	)		0.0
Interest expense (income)		(0.1	)		6.9			0.0		1.1			0.3		(1.3	)		6.9
Income taxes		(0.1	)		2.1			0.0		3.1			0.1		0.0			5.2

Income from continuing operations		8.9			(5.3	)		4.9		8.7			1.2		(9.2	)		9.2
Discontinued operations		0.0			0.0			0.0		(0.2	)		0.0		0.0			(0.2	)
Noncontrolling interests		0.0			0.0			0.0		0.0			0.1		0.0			0.1

Net income attributable to Koppers	$	8.9		$	(5.3	)	$	4.9	$	8.5		$	1.1	$	(9.2	)	$	8.9

Comprehensive income attributable to Koppers	$	16.6		$	(4.4	)	$	5.8	$	14.5		$	1.3	$	(17.2	)	$	16.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2011


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	854.1	$	72.6		$	443.6		$	147.0	$	(51.1	)	$	1,466.2
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6			363.7			138.5		(29.7	)		1,269.2
Selling, general and administrative		1.2			41.6		1.8			26.2			3.5		0.0			74.3

Operating profit (loss)		6.6			49.6		29.2			53.7			5.0		(21.4	)		122.7
Other income (expense)		29.9			0.3		0.0			(0.3	)		0.7		(29.9	)		0.7
Interest expense (income)		0.0			27.5		(0.1	)		4.9			0.5		(5.6	)		27.2
Income taxes		(0.4	)		7.7		0.8			28.7			1.9		0.0			38.7

Income from continuing operations		36.9			14.7		28.5			19.8			3.3		(45.7	)		57.5
Discontinued operations		0.0			0.0		0.0			(19.9	)		0.0		0.0			(19.9	)
Noncontrolling interests		0.0			0.0		0.0			0.0			0.7		0.0			0.7

Net income attributable to Koppers	$	36.9		$	14.7	$	28.5		$	(0.1	)	$	2.6	$	(45.7	)	$	36.9

Comprehensive income attributable to Koppers	$	18.9		$	1.1	$	28.0		$	(5.1	)	$	3.5	$	(27.5	)	$	18.9

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2010


	Parent			Koppers Inc.		Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	721.2	$	45.8		$	358.5	$	105.9	$	(40.9	)	$	1,190.5
Cost of sales including depreciation and amortization		0.0			657.7		19.1			286.0		94.9		(27.7	)		1,030.0
Selling, general and administrative		1.6			32.2		3.3			21.4		3.9		0.0			62.4

Operating profit (loss)		(1.6	)		31.3		23.4			51.1		7.1		(13.2	)		98.1
Other income (expense)		45.0			0.2		(0.4	)		2.4		0.3		(45.0	)		2.5
Interest expense (income)		(0.2	)		27.9		0.0			4.4		0.0		(5.0	)		27.1
Income taxes		(0.5	)		1.5		12.2			13.3		2.4		0.0			28.9

Income from continuing operations		44.1			2.1		10.8			35.8		5.0		(53.2	)		44.6
Discontinued operations		0.0			0.0		(0.2	)		0.1		0.0		0.0			(0.1	)
Noncontrolling interests		0.0			0.0		0.0			0.0		0.4		0.0			0.4

Net income attributable to Koppers	$	44.1		$	2.1	$	10.6		$	35.9	$	4.6	$	(53.2	)	$	44.1

Comprehensive income attributable to Koppers	$	54.6		$	1.8	$	18.9		$	40.3	$	5.1	$	(66.1	)	$	54.6

Condensed Consolidating Statement of Comprehensive Income

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Net sales	$	0.0		$	709.1		$	33.0		$	306.4	$	79.3		$	(52.6	)	$	1,075.2
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		248.8		67.0			(28.8	)		924.2
Selling, general and administrative		1.8			28.8			3.0			19.7		4.0			0.0			57.3

Operating profit (loss)		(1.8	)		39.4			33.7			37.9		8.3			(23.8	)		93.7
Other income (expense)		40.2			0.5			(0.3	)		0.9		(1.3	)		(40.2	)		(0.2	)
Interest expense (income)		31.1			28.5			0.0			4.2		(0.1	)		(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			9.7		2.2			0.0			13.4

Income from continuing operations		18.8			9.4			22.4			24.9		4.9			(59.0	)		21.4
Discontinued operations		0.0			(0.3	)		0.0			0.3		0.0			0.0			0.0
Noncontrolling interests		0.0			0.0			0.0			0.0		2.6			0.0			2.6

Net income attributable to Koppers	$	18.8		$	9.1		$	22.4		$	25.2	$	2.3		$	(59.0	)	$	18.8

Comprehensive income attributable to Koppers	$	43.5		$	12.2		$	35.0		$	39.1	$	1.4		$	(87.7	)	$	43.5

Condensed Consolidating Balance Sheet

March 31, 2012


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	40.0	$	2.6		$	0.0		$	42.6
Accounts receivable, net		5.8		113.1			301.3			81.1		19.1			(328.0	)		192.4
Inventories, net		0.0		99.0			0.0			71.1		8.2			(0.1	)		178.2
Deferred tax assets		0.0		10.9			(1.5	)		0.0		0.2			0.0			9.6
Other current assets		0.0		7.2			0.3			9.9		14.5			0.0			31.9

Total current assets		5.8		230.2			300.1			202.1		44.6			(328.1	)		454.7
Equity investments		111.7		77.1			26.5			19.8		4.2			(233.9	)		5.4
Property, plant and equipment, net		0.0		100.3			0.0			38.0		15.4			0.0			153.7
Goodwill		0.0		39.8			0.0			31.9		1.3			0.0			73.0
Deferred tax assets		0.0		41.2			(10.5	)		12.4		(1.6	)		0.0			41.5
Other noncurrent assets		0.0		17.7			126.9			6.8		37.2			(162.8	)		25.8

Total assets	$	117.5	$	506.3		$	443.0		$	311.0	$	101.1		$	(724.8	)	$	754.1

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	353.4		$	15.3		$	36.7	$	18.8		$	(327.7	)	$	96.6
Accrued liabilities		4.9		30.2			(0.9	)		26.4		5.9			0.0			66.5

Total current liabilities		5.0		383.6			14.4			63.1		24.7			(327.7	)		163.1
Long-term debt		0.0		413.0			0.0			64.5		0.0			(163.2	)		314.3
Other long-term liabilities		0.0		116.6			2.5			26.1		6.3			0.0			151.5

Total liabilities		5.0		913.2			16.9			153.7		31.0			(490.9	)		628.9
Koppers shareholders’ equity		112.5		(406.9	)		426.1			157.3		57.4			(233.9	)		112.5
Noncontrolling interests		0.0		0.0			0.0			0.0		12.7			0.0			12.7

Total liabilities and equity	$	117.5	$	506.3		$	443.0		$	311.0	$	101.1		$	(724.8	)	$	754.1

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	45.1	$	9.0		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			65.5		13.7			(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			77.2		7.0			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			12.0		14.4			0.0			33.5

Total current assets		5.5		204.9			282.8			199.8		44.2			(309.8	)		427.4
Equity investments		93.9		77.1			26.3			19.3		3.9			(215.6	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			37.8		15.8			0.0			155.6
Goodwill		0.0		39.8			0.0			31.0		1.3			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.7		(1.6	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			6.7		37.7			(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.8		$	44.4	$	13.2		$	(309.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.8	)		30.5		6.9			0.0			68.3

Total current liabilities		4.6		371.7			9.0			74.9		20.1			(309.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		6.3			(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			25.8		6.1			0.1			151.0

Total liabilities		4.6		889.0			11.5			163.4		32.5			(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			143.9		56.4			(215.6	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2011


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	0.0		$	0.0		$	45.1	$	9.0		$	0.0		$	54.1
Accounts receivable, net		5.5		112.6			284.0			65.5		13.7			(309.8	)		171.5
Inventories, net		0.0		74.8			0.0			77.2		7.0			0.0			159.0
Deferred tax assets		0.0		10.7			(1.5	)		0.0		0.1			0.0			9.3
Other current assets		0.0		6.8			0.3			12.0		14.4			0.0			33.5

Total current assets		5.5		204.9			282.8			199.8		44.2			(309.8	)		427.4
Equity investments		93.9		77.1			26.3			19.3		3.9			(215.6	)		4.9
Property, plant and equipment, net		0.0		102.0			0.0			37.8		15.8			0.0			155.6
Goodwill		0.0		39.8			0.0			31.0		1.3			0.0			72.1
Deferred tax assets		0.0		43.7			(10.5	)		12.7		(1.6	)		0.0			44.3
Other noncurrent assets		0.0		18.4			131.3			6.7		37.7			(167.7	)		26.4

Total assets	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

LIABILITIES AND EQUITY
Accounts payable	$	0.1	$	344.5		$	9.8		$	44.4	$	13.2		$	(309.9	)	$	102.1
Accrued liabilities		4.5		27.2			(0.8	)		30.5		6.9			0.0			68.3

Total current liabilities		4.6		371.7			9.0			74.9		20.1			(309.9	)		170.4
Long-term debt		0.0		400.8			0.0			62.7		6.3			(167.7	)		302.1
Other long-term liabilities		0.0		116.5			2.5			25.8		6.1			0.1			151.0

Total liabilities		4.6		889.0			11.5			163.4		32.5			(477.5	)		623.5
Koppers shareholders’ equity		94.8		(403.1	)		418.4			143.9		56.4			(215.6	)		94.8
Noncontrolling interests		0.0		0.0			0.0			0.0		12.4			0.0			12.4

Total liabilities and equity	$	99.4	$	485.9		$	429.9		$	307.3	$	101.3		$	(693.1	)	$	730.7

Condensed Consolidating Balance Sheet

December 31, 2010


	Parent		Koppers Inc.			Domestic Guarantor Subsidiaries			Foreign Guarantor Subsidiaries		Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
ASSETS
Cash and cash equivalents	$	0.0	$	8.4		$	0.0		$	17.0	$	9.9		$	0.0		$	35.3
S-T investments & restricted cash		0.0		0.0			0.0			0.0		0.0			0.0			0.0
Accounts receivable, net		16.6		80.3			460.9			63.3		44.2			(524.5	)		140.8
Inventories, net		0.0		78.3			1.2			76.4		9.5			0.0			165.4
Deferred tax assets		0.0		7.4			(1.5	)		0.0		0.0			0.0			5.9
Other current assets		0.0		6.9			0.3			14.3		1.5			0.0			23.0

Total current assets		16.6		181.3			460.9			171.0		65.1			(524.5	)		370.4
Equity investments		76.7		77.1			26.2			19.4		3.9			(198.6	)		4.7
Property, plant and equipment, net		0.0		94.7			0.0			57.6		15.9			0.0			168.2
Goodwill		0.0		39.5			0.0			31.3		1.3			0.0			72.1
Deferred tax assets		0.0		65.4			(43.8	)		5.9		(1.4	)		0.0			26.1
Other noncurrent assets		0.0		21.6			0.0			4.7		1.3			0.1			27.7

Total assets	$	93.3	$	479.6		$	443.3		$	289.9	$	86.1		$	(723.0	)	$	669.2

LIABILITIES AND EQUITY
Accounts payable	$	0.0	$	492.5		$	15.1		$	94.7	$	10.0		$	(524.4	)	$	87.9
Accrued liabilities		4.6		(6.3	)		34.8			21.7		5.7			0.0			60.5
Short-term debt and current portion of long-term debt		0.0		0.1			0.0			0.8		0.1			0.0			1.0

Total current liabilities		4.6		486.3			49.9			117.2		15.8			(524.4	)		149.4
Long-term debt		0.0		295.4			0.0			0.0		0.0			0.0			295.4
Other long-term liabilities		0.0		99.6			3.0			15.7		6.2			0.0			124.5

Total liabilities		4.6		881.3			52.9			132.9		22.0			(524.4	)		569.3
Koppers shareholders’ equity		88.7		(401.7	)		390.4			157.0		52.9			(198.6	)		88.7
Noncontrolling interests		0.0		0.0			0.0			0.0		11.2			0.0			11.2

Total liabilities and equity	$	93.3	$	479.6		$	443.3		$	289.9	$	86.1		$	(723.0	)	$	669.2

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2012


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	5.6		$	(9.4	)	$	0.0	$	(5.6	)	$	(6.4	)	$	0.0	$	(15.8	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(2.7	)		0.0		(0.7	)		0.0			0.0		(3.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.2			0.0			0.0		0.2

Net cash provided by (used in) investing activities		0.0			(2.7	)		0.0		(0.5	)		0.0			0.0		(3.2	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			12.1			0.0		0.0			0.0			0.0		12.1
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		(1.1	)		0.0			0.0		0.0			0.0			0.0		(1.1	)

Net cash provided by (used in) financing activities		(5.6	)		12.1			0.0		0.0			0.0			0.0		6.5
Effect of exchange rates on cash		0.0			0.0			0.0		1.0			0.0			0.0		1.0

Net increase (decrease) in cash and cash equivalents		0.0			0.0			0.0		(5.1	)		(6.4	)		0.0		(11.5	)
Cash and cash equivalents at beginning of year		0.0			0.0			0.0		45.1			9.0			0.0		54.1

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	40.0		$	2.6		$	0.0	$	42.6

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	4.6		$	(28.7	)	$	0.0	$	17.7		$	(3.1	)	$	0.0	$	(9.5	)
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(3.6	)		0.0		(1.4	)		0.0			0.0		(5.0	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) investing activities		0.0			(3.6	)		0.0		(1.4	)		0.0			0.0		(5.0	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(0.1	)		24.5			0.0		(0.9	)		0.1			0.0		23.6
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(4.5	)		0.0			0.0		0.0			0.0			0.0		(4.5	)
Stock issued (repurchased)		0.0			0.0			0.0		0.0			0.0			0.0		0.0

Net cash provided by (used in) financing activities		(4.6	)		24.0			0.0		(0.9	)		0.1			0.0		18.6
Effect of exchange rates on cash		0.0			(0.1	)		0.0		1.1			0.1			0.0		1.1

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		16.5			(2.9	)		0.0		5.2
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		17.0			9.9			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	33.5		$	7.0		$	0.0	$	40.5

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2011


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments		Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.1		$	9.5		$	0.0	$	37.9		$	11.4		$	0.0	$	76.9
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(24.5	)		0.0		(8.6	)		(0.7	)		0.0		(33.8	)
Loan to related party		0.0			0.0			0.0		0.0			(11.7	)		0.0		(11.7	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.7			0.0		0.1			0.0			0.0		0.8

Net cash (used in) investing activities		0.0			(23.8	)		0.0		(8.5	)		(12.4	)		0.0		(44.7	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			6.3			0.0		(0.9	)		0.0			0.0		5.4
Deferred financing costs		0.0			(0.5	)		0.0		0.0			0.0			0.0		(0.5	)
Dividends paid		(18.1	)		0.0			0.0		0.0			(0.1	)		0.0		(18.2	)

Net cash provided by (used in) financing activities		(18.1	)		5.8			0.0		(0.9	)		(0.1	)		0.0		(13.3	)
Effect of exchange rates on cash		0.0			0.1			0.0		(0.4	)		0.2			0.0		(0.1	)

Net increase (decrease) in cash and cash equivalents		0.0			(8.4	)		0.0		28.1			(0.9	)		0.0		18.8
Cash and cash equivalents at beginning of year		0.0			8.4			0.0		17.0			9.9			0.0		35.3

Cash and cash equivalents at end of period	$	0.0		$	0.0		$	0.0	$	45.1		$	9.0		$	0.0	$	54.1

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2010


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	18.7		$	75.2		$	0.0	$	9.1		$	6.8		$	(4.5	)	$	105.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(35.0	)		0.0		(30.0	)		(0.4	)		0.0			(65.4	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			0.2			0.0		1.7			0.1			0.0			2.0

Net cash (used in) investing activities		0.0			(34.8	)		0.0		(28.3	)		(0.3	)		0.0			(63.4	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		0.0			(40.2	)		0.0		0.0			0.0			0.0			(40.2	)
Deferred financing costs		0.0			(0.4	)		0.0		0.0			0.0			0.0			(0.4	)
Dividends paid		(18.1	)		(4.5	)		0.0		0.0			(5.0	)		4.5			(23.1	)
Stock issued (repurchased)		(0.8	)		0.2			0.0		0.0			0.0			0.0			(0.6	)

Net cash provided by (used in) financing activities		(18.9	)		(44.9	)		0.0		0.0			(5.0	)		4.5			(64.3	)
Effect of exchange rates on cash		0.0			0.0			0.0		(0.7	)		0.0			0.0			(0.7	)

Net increase (decrease) in cash and cash equivalents		(0.2	)		(4.5	)		0.0		(19.9	)		1.5			0.0			(23.1	)
Cash and cash equivalents at beginning of year		0.2			12.9			0.0		36.9			8.4			0.0			58.4

Cash and cash equivalents at end of period	$	0.0		$	8.4		$	0.0	$	17.0		$	9.9		$	0.0		$	35.3

Condensed Consolidating Statement of Cash Flows

For the Year Ended December 31, 2009


	Parent			Koppers Inc.			Domestic Guarantor Subsidiaries		Foreign Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
(Dollars in millions)
Cash provided by (used in) operating activities	$	231.8		$	90.7		$	0.0	$	19.5		$	3.0		$	(232.7	)	$	112.3
Cash provided by (used in) investing activities:
Capital expenditures and acquisitions		0.0			(15.0	)		0.0		(3.7	)		(1.5	)		0.0			(20.2	)
Net cash proceeds (payments) from divestitures and asset sales		0.0			(0.7	)		0.0		0.1			0.0			0.0			(0.6	)

Net cash (used in) investing activities		0.0			(15.7	)		0.0		(3.6	)		(1.5	)		0.0			(20.8	)
Cash provided by (used in) financing activities:
Borrowings (repayments) of long-term debt		(213.6	)		142.8			0.0		0.0			0.0			0.0			(70.8	)
Deferred financing costs		0.0			(8.1	)		0.0		0.0			0.0			0.0			(8.1	)
Dividends paid		(18.0	)		(232.7	)		0.0		0.0			0.0			232.7			(18.0	)

Net cash provided by (used in) financing activities		(231.6	)		(98.0	)		0.0		0.0			0.0			232.7			(96.9	)
Effect of exchange rates on cash		0.0			(1.6	)		0.0		2.3			0.0			0.0			0.7

Net increase (decrease) in cash and cash equivalents		0.2			(24.6	)		0.0		18.2			1.5			0.0			(4.7	)
Cash and cash equivalents at beginning of year		0.0			37.5			0.0		18.7			6.9			0.0			63.1

Cash and cash equivalents at end of period	$	0.2		$	12.9		$	0.0	$	36.9		$	8.4		$	0.0		$	58.4

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies [Abstract]

Summary of Self-Insured Liabilities


	2011			2010
(Dollars in millions)
Self-insured liabilities at beginning of year	$	7.9		$	12.1
Expense		2.1			2.5
Reversal of self-insured liabilities		(1.0	)		(4.5	)
Cash expenditures		(1.6	)		(2.2	)

Self-insured liabilities at end of year	$	7.4		$	7.9

Summary of Asset Retirement Obligation Liabilities


	2011			2010
(Dollars in millions)
Asset retirement obligation at beginning of year	$	17.0		$	16.6
Accretion expense		1.1			1.3
Revision in estimated cash flows		6.3			1.5
Cash expenditures		(3.1	)		(2.4	)
Acquisitions		0.0			0.3
Currency translation		0.0			(0.3	)

Asset retirement obligation at end of year	$	21.3		$	17.0

Summary of Changes to Deferred Revenue


	2011			2010
(Dollars in millions)
Deferred revenue at beginning of year	$	5.7		$	6.7
Revenue earned		(0.9	)		(1.0	)

Deferred revenue at end of year	$	4.8		$	5.7

Business Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Business Acquisitions [Abstract]

Schedule of Identifiable Assets Acquired and Liabilities Assumed upon Acquisition


	March 1, 2010
(Dollars in millions)
Cash and cash equivalents	$	2.1
Accounts receivable		6.5
Inventory		7.1
Other current assets		2.8
Property, plant and equipment		8.7
Intangibles		4.4
Goodwill		6.1

Total assets acquired		37.7
Accounts payable		9.8
Accrued liabilities		3.0
Long-term debt		0.6
Deferred tax liability		2.2
Long-term liabilities		0.5

Net assets acquired	$	21.6

Restructuring (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2012

Dec. 31, 2011

Restructuring [Abstract]

Summary of Restructuring Activities and Related Reserves


	Severance and employee benefits			Environmental remediation		Inventory writedowns			Site demolition		Other			Total
(Dollars in millions)
Reserve at December 31, 2011	$	1.8		$	6.7	$	0.0		$	6.2	$	1.2		$	15.9
Charges		0.0			0.0		0.3			0.0		0.0			0.3
Costs charged against assets		0.0			0.0		(0.3	)		0.0		0.0			(0.3	)
Reversals		(0.1	)		0.0		0.0			0.0		0.0			(0.1	)
Cash paid		(0.9	)		0.0		0.0			0.0		(0.2	)		(1.1	)
Currency translation		0.0			0.2		0.0			0.2		0.0			0.4

Reserve at March 31, 2012	$	0.8		$	6.9	$	0.0		$	6.4	$	1.0		$	15.1


	Severance and employee benefits			Environmental remediation		Asset impairment			Inventory writedowns			Site demolition		Other		Total
(Dollars in millions)
Reserve at January 1, 2011	$	0.0		$	0.0	$	0.0		$	0.0		$	0.0	$	0.0	$	0.0
Charges		3.4			6.7		20.2			3.3			6.2		1.2		41.0
Costs charged against assets		0.0			0.0		(20.2	)		(3.3	)		0.0		0.0		(23.5	)
Cash paid		(1.6	)		0.0		0.0			0.0			0.0		0.0		(1.6	)

Reserve at December 31, 2011	$	1.8		$	6.7	$	0.0		$	0.0		$	6.2	$	1.2	$	15.9

Equity Investments (Tables)

12 Months Ended

Dec. 31, 2011

Equity Investments [Abstract]

Equity Earnings (Losses) and Dividends Received


	Equity income (loss)			Dividends received
(Dollars in millions)
2011	$	0.2		$	0.0
2010		0.0			0.0
2009		(1.5	)		0.5

Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Other Identifiable Intangible Assets [Abstract]

Changes in the Carrying Amount of Goodwill


	Carbon Materials & Chemicals			Railroad & Utility Products			Total
(Dollars in millions)
Balance at December 31, 2009	$	59.4		$	2.2		$	61.6
Acquisitions		8.6			0.0			8.6
Currency translation		1.6			0.3			1.9

Balance at December 31, 2010		69.6			2.5			72.1
Acquisitions		0.1			0.3			0.4
Currency translation		(0.3	)		(0.1	)		(0.4	)

Balance at December 31, 2011	$	69.4		$	2.7		$	72.1

Schedule of Identifiable Intangible Assets


	December 31,
	2011						2010
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
(Dollars in millions)
Customer contracts	$	12.3	$	6.8	$	5.5	$	13.2	$	5.9	$	7.3
Supply contracts		2.7		0.5		2.2		2.8		0.2		2.6
Favorable lease agreements		0.8		0.5		0.3		0.8		0.2		0.6
Non-compete agreements		1.2		1.2		0.0		1.2		1.2		0.0

Total	$	17.0	$	9.0	$	8.0	$	18.0	$	7.5	$	10.5

Schedule of Future Amortization Expense


	Estimated annual amortization
(Dollars in millions)
2012	$	1.5
2013		1.3
2014		1.2
2015		1.2
2016		0.8

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Leases (Tables)

12 Months Ended

Dec. 31, 2011

Leases [Abstract]

Future Minimum Commitments for Operating Leases



(Dollars in millions)
2012	$	38.1
2013		27.9
2014		13.5
2015		7.9
2016		6.3
Thereafter		31.1

Total	$	124.8

Common Stock and Senior Convertible Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2011

Common Stock and Senior Convertible Preferred Stock [Abstract]

Schedule of Changes in Senior Convertible Preferred Stock, Common Stock and Treasury Stock


	Year Ended December 31,
	2011			2010			2009
(Shares in thousands)
Senior Convertible Preferred Stock:
Balance at beginning and end of year		0			0			0

Common Stock:
Balance at beginning of year		21,278			21,124			21,097
Issued for employee stock plans		31			154			27

Balance at end of year		21,309			21,278			21,124

Treasury Stock:
Balance at beginning of year		(700	)		(669	)		(669	)
Shares repurchased		(6	)		(31	)		0

Balance at end of year		(706	)		(700	)		(669	)

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 02
-Paragraph 29

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 150
-Paragraph 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21553-112644

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21300-112643

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.28,29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802392&loc=d3e177068-122764

+ Details

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data (Unaudited) [Abstract]

Schedule of Selected Quarterly Financial Data


	Year Ended December 31, 2011
	1^stQuarter			2^ndQuarter			3^rdQuarter		4^thQuarter			Fiscal Year
(Dollars in millions, except per share amounts)
Statement of operations data:
Net sales	$	341.5		$	374.5		$	381.2	$	369.0		$	1,466.2
Operating profit		21.3			38.3			40.1		23.0			122.7
Income from continuing operations		9.2			20.4			22.5		5.4			57.5
Net income (loss)^(a)		9.0			19.9			22.7		(14.0	)		37.6
Net income (loss) attributable to Koppers^(a)		8.9			19.8			22.4		(14.2	)		36.9
Common stock data:
Earnings (loss) per common share attributable to Koppers common shareholders:
Basic –
Continuing operations	$	0.44		$	0.99		$	1.07	$	0.25		$	2.75
Discontinued operations^(a)		(0.01	)		(0.03	)		0.01		(0.94	)		(0.96	)

Earnings per basic common share	$	0.43		$	0.96		$	1.08	$	(0.69	)	$	1.79

Diluted –
Continuing operations	$	0.44		$	0.99		$	1.07	$	0.24		$	2.72
Discontinued operations^(a)		(0.01	)		(0.03	)		0.01		(0.93	)		(0.95	)

Earnings per diluted common share	$	0.43		$	0.96		$	1.08	$	(0.69	)	$	1.77

Dividends declared per common share	$	0.22		$	0.22		$	0.22	$	0.22		$	0.88
Price range of common stock:
High	$	42.88		$	46.14		$	39.23	$	36.53		$	46.14
Low		34.76			34.63			23.59		24.75			23.59

(a)


	Year Ended December 31, 2010
	1^stQuarter			2^ndQuarter			3^rdQuarter		4^thQuarter		Fiscal Year
(Dollars in millions, except per share amounts)
Statement of operations data:
Net sales	$	259.2		$	316.5		$	321.7	$	293.1	$	1,190.5
Operating profit		17.0			32.8			33.1		15.2		98.1
Income from continuing operations		7.5			16.4			15.8		4.9		44.6
Net income		7.4			16.1			15.8		5.2		44.5
Net income attributable to Koppers		7.3			16.1			15.6		5.1		44.1
Common stock data:
Earnings (loss) per common share attributable to Koppers common shareholders:
Basic –
Continuing operations	$	0.37		$	0.79		$	0.76	$	0.23	$	2.14
Discontinued operations		(0.01	)		(0.01	)		0.00		0.01		0.00

Earnings per basic common share	$	0.36		$	0.78		$	0.76	$	0.24	$	2.14

Diluted –
Continuing operations	$	0.37		$	0.79		$	0.75	$	0.23	$	2.13
Discontinued operations		(0.01	)		(0.01	)		0.00		0.01		0.00

Earnings per diluted common share	$	0.36		$	0.78		$	0.75	$	0.24	$	2.13

Dividends declared per common share	$	0.22		$	0.22		$	0.22	$	0.22	$	0.88
Price range of common stock:
High	$	33.32		$	33.56		$	27.19	$	36.47	$	36.47
Low		25.58			22.42			19.77		25.69		19.77

Dividends (Narrative) (Details) - $ / shares	1 Months Ended	3 Months Ended									12 Months Ended
Dividends (Narrative) (Details) - $ / shares	Feb. 15, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividends (Textual) [Abstract]
Dividends declared per common share	$ 0.24	$ 0.24	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.88	$ 0.88	$ 0.88
Common share, dividend declared date		May 03, 2012
Common share, dividend payable date		Jul. 09, 2012
Common share, dividend record date		May 15, 2012

Discontinued operations (Summary Of Restructuring Activities And Related Reserves) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2010
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	$ 15.9
Charges	0.3	$ 41.0
Costs charged against assets	(0.3)	(23.5)
Reversals	(0.1)
Cash paid	(1.1)	(1.6)
Currency translation	0.4
Reserve at end	15.1	0.0
Reserve at end	15.1	0.0
Severance And Employee Benefits [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	1.8
Charges	0.0	3.4
Costs charged against assets	0.0	0.0
Reversals	(0.1)
Cash paid	(0.9)	(1.6)
Currency translation	0.0
Reserve at end	0.8	0.0
Reserve at end	0.8	0.0
Environmental Remediation [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	6.7
Charges	0.0	6.7
Costs charged against assets	0.0	0.0
Reversals	0.0
Cash paid	0.0	0.0
Currency translation	0.2
Reserve at end	6.9	0.0
Reserve at end	6.9	0.0
Inventory Writedowns [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	0.0
Charges	0.3	3.3
Costs charged against assets	(0.3)	(3.3)
Reversals	0.0
Cash paid	0.0	0.0
Currency translation	0.0
Reserve at end	0.0	0.0
Reserve at end	0.0	0.0
Site Demolition [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	6.2
Charges	0.0	6.2
Costs charged against assets	0.0	0.0
Reversals	0.0
Cash paid	0.0	0.0
Currency translation	0.2
Reserve at end	6.4	0.0
Reserve at end	6.4	0.0
Restructuring Activities Other [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	1.2
Charges	0.0	1.2
Costs charged against assets	0.0	0.0
Reversals	0.0
Cash paid	(0.2)	0.0
Currency translation	0.0
Reserve at end	1.0	0.0
Reserve at end	$ 1.0	$ 0.0

Discontinued operations (Summary Of Net Sales And Operating Profit From Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Summary of net sales and operating profit from discontinued operations
Net sales	$ 5.1	$ 17.6
Operating profit	$ 0.3	$ (0.5)

Discontinued operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2011
Discontinued operations (Textual) [Abstract]
Costs related to closure		$ 41.0	$ 41.0
Estimated total future closure costs	$ 1.6		$ 1.7
Future completion period, closure	2014		2014
Cost of Sales [Member]
Discontinued operations (Textual) [Abstract]
Costs related to closure		20.8	$ 20.8
Depreciation and Amortization [Member]
Discontinued operations (Textual) [Abstract]
Costs related to closure		$ 20.2	$ 20.2

- Definition

The charge against earnings in the period, comprised of costs incurred associated with an exit or disposal activity other than for a discontinued operations as defined under generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References + Details

Fair Value Measurements (Schedule Of Company's Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value [Member]
Schedule of Company's Financial Instruments
Cash and cash equivalents	$ 42.6	$ 54.1	$ 35.3
Investments and other assets	1.3	1.3	1.3
Long-term debt (including current portion)	340.3	324.4	324.5
Carrying Value [Member]
Schedule of Company's Financial Instruments
Cash and cash equivalents	42.6	54.1	35.3
Investments and other assets	1.3	1.3	1.3
Long-term debt (including current portion)	$ 314.3	$ 302.1	$ 296.4

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References + Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the portion of a balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount that could be realized under a life insurance contract or contracts owned by the Company as of the date of the statement of financial position. Such Company-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References + Details

Comprehensive Income and Equity (Schedule Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Comprehensive Income
Net income	$ 15.9	$ (14.0)	$ 22.7	$ 19.9	$ 9.0	$ 5.2	$ 15.8	$ 16.1	$ 7.4	$ 37.6	$ 44.5	$ 21.4
Other comprehensive income (loss):
Change in currency translation adjustment	5.5				6.9					(2.5)	11.5	24.0
Change in unrecognized pension net loss, net of tax	1.3				0.9					(14.9)	(0.7)	1.9
Change in unrecognized pension transition asset, net of tax	(0.1)				0.0					0.2	0.2	0.2
Total comprehensive income	22.6				16.8					20.1	55.3	47.0
Less: comprehensive income attributable to noncontrolling interests	0.3				0.2					1.2	0.7	3.5
Comprehensive income attributable to Koppers	$ 22.3				$ 16.6					$ 18.9	$ 54.6	$ 43.5

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 8, 9, 10, 11, 12, 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A5
-Appendix A

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e557-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e540-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6508144

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests, if any. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The accumulated change in the value of either the projected benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost, after tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4
-Subparagraph c, d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 19, 24
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 19, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 13, 20, 31
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The adjustment out of other comprehensive income for the net transition asset or obligation recognized as a component of net periodic benefit cost during the period, after tax.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A1, A4, A5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591552-111686

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=6921628&loc=SL4569616-111683

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591551-111686

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=6921930&loc=SL4573702-111684

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Comprehensive Income and Equity (Schedule Of Change In Equity) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Change in Equity
Beginning balance	$ 107.2			$ 113.0	$ 99.9				$ 54.8	$ 99.9	$ 54.8
Net income	15.9	$ (14.0)	$ 22.7	19.9	9.0	$ 5.2	$ 15.8	$ 16.1	$ 7.4	37.6	44.5	$ 21.4
Issuance of common stock	0.6				0.2
Employee stock plans	1.6				0.9
Other comprehensive income	6.7				7.8
Dividends	(5.1)				(4.6)
Repurchases of common stock	(1.7)				(0.2)
Ending balance	125.2	107.2			113.0	99.9				107.2	99.9	54.8
Ending balance	125.2	107.2			113.0	99.9				107.2	99.9	$ 54.8
Total Koppers Shareholders' Equity' [Member]
Schedule of Change in Equity
Beginning balance	94.8			101.6	88.7					88.7
Net income	15.6				8.9
Issuance of common stock	0.6				0.2
Employee stock plans	1.6				0.9
Other comprehensive income	6.7				7.7
Dividends	(5.1)				(4.6)
Repurchases of common stock	(1.7)				(0.2)
Ending balance	112.5	94.8			101.6	88.7				94.8	88.7
Ending balance	112.5	94.8			101.6	88.7				94.8	88.7
Noncontrolling Interests [Member]
Schedule of Change in Equity
Beginning balance	12.4			$ 11.4	11.2					11.2
Net income	0.3				0.1
Issuance of common stock	0.0				0.0
Employee stock plans	0.0				0.0
Other comprehensive income	0.0				0.1
Dividends	0.0				0.0
Repurchases of common stock	0.0				0.0
Ending balance	12.7	12.4			11.4	11.2				12.4	11.2
Ending balance	$ 12.7	$ 12.4			$ 11.4	$ 11.2				$ 12.4	$ 11.2

Earnings Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended									12 Months Ended
	Feb. 15, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Basic and Diluted Earnings per Common Share
Net Income (Loss) Attributable to Parent		$ 15.6	$ (14.2)	$ 22.4	$ 19.8	$ 8.9	$ 5.1	$ 15.6	$ 16.1	$ 7.3	$ 36.9	$ 44.1	$ 18.8
Less: Income (loss) from discontinued operations		0.1				(0.2)					0.0	(0.2)	(0.3)
Income from continuing operations attributable to Koppers		$ 15.5				$ 9.1					$ 36.9	$ 44.3	$ 19.1
Weighted Average Number of Shares Outstanding, Basic		20,669				20,588					20,599	20,543	20,446
Effect of dilutive securities		234				136					234	133	115
Diluted		20,903				20,724					20,833	20,676	20,561
Basic earnings per common share		$ 0.74				$ 0.44	$ 0.24	$ 0.76	$ 0.79	$ 0.36	$ 1.79	$ 2.15	$ 0.93
Diluted earnings per common share		$ 0.74				$ 0.44	0.24	0.75	0.79	0.36	$ 1.77	$ 2.14	$ 0.92
Antidilutive securities excluded from computation of diluted earnings per common share		181				95					106	154	103
Earnings and Dividends per Common Share (Textual) [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.24	$ 0.24	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.88	$ 0.88	$ 0.88

Stock-Based Compensation (Summary Of Performance Stock Units With Uncompleted Performance Periods) (Details) - shares	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Performance Stock Units
Number of shares outstanding	409,789	353,452	291,591
2009-2011 [Member] \| Performance Stock Units [Member]
Summary of Performance Stock Units
Number of shares outstanding		134,928
2009-2011 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Summary of Performance Stock Units
Number of shares outstanding		0
2009-2011 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Summary of Performance Stock Units
Number of shares outstanding		202,392
2010-2011 [Member] \| Performance Stock Units [Member]
Summary of Performance Stock Units
Number of shares outstanding		65,411
2010-2011 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Summary of Performance Stock Units
Number of shares outstanding		0
2010-2011 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Summary of Performance Stock Units
Number of shares outstanding		98,117
2011-2012 [Member] \| Performance Stock Units [Member]
Summary of Performance Stock Units
Number of shares outstanding	88,010	89,056
2011-2012 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Summary of Performance Stock Units
Number of shares outstanding	0	0
2011-2012 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Summary of Performance Stock Units
Number of shares outstanding	132,015	133,584
2012-2014 [Member] \| Performance Stock Units [Member]
Summary of Performance Stock Units
Number of shares outstanding	104,598
2012-2014 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Summary of Performance Stock Units
Number of shares outstanding	0
2012-2014 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Summary of Performance Stock Units
Number of shares outstanding	156,897

Stock-Based Compensation (Summary Of Non-Vested Stock Activity) (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Summary of Non-Vested Stock Activity
Non-vested, Beginning Balance	454,380	378,399
Granted	156,644	153,616
Credited from dividends	10,430	11,320
Performance stock unit adjustment	(40,112)	(50,600)
Vested	(156,256)	(23,580)
Forfeited	(2,545)	(14,775)
Non-vested, Ending Balance	422,541	454,380
Non-vested, Beginning, Weighted Average Grant Date Fair Value per Unit	$ 26.43	$ 23.31
Granted, Weighted Average Grant Date Fair Value per Unit	38.21	40.41
Credited from dividends, Weighted Average Grant Date Fair Value per Unit	35.74	27.31
Performance stock unit adjustment, Weighted Average Grant Date Fair Value per Unit	10.68	38.92
Vested, Weighted Average Grant Date Fair Value per Unit	16.42	38.92
Forfeited, Weighted Average Grant Date Fair Value per Unit	36.43	29.96
Non-vested, Ending, Weighted Average Grant Date Fair Value per Unit	$ 36.16	$ 26.43
Restricted Stock Units [Member]
Summary of Non-Vested Stock Activity
Non-vested, Beginning Balance	156,665	121,397
Granted	52,046	60,501
Credited from dividends	3,358	3,627
Performance stock unit adjustment	0	0
Vested	(69,243)	(23,580)
Forfeited	(1,022)	(5,280)
Non-vested, Ending Balance	141,804	156,665
Performance Stock Units [Member]
Summary of Non-Vested Stock Activity
Non-vested, Beginning Balance	297,715	257,002
Granted	104,598	93,115
Credited from dividends	7,072	7,693
Performance stock unit adjustment	(40,112)	(50,600)
Vested	(87,013)	0
Forfeited	(1,523)	(9,495)
Non-vested, Ending Balance	280,737	297,715

Stock-Based Compensation (Stock Options Fair Value Assumptions) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2012 yr $ / shares	Dec. 31, 2011 yr $ / shares
February 2012 Grant [Member]
Stock Options Fair Value Assumptions
Grant date price per share of option award	$ 38.21
Expected dividend yield per share	2.75%
Expected life in years \| yr	6.5
Expected volatility	55.06%
Risk-free interest rate	1.34%
Grant date fair value per share of option awards	$ 15.82
February 2011 Grant [Member]
Stock Options Fair Value Assumptions
Grant date price per share of option award	$ 40.26	$ 40.26
Expected dividend yield per share	2.50%	2.50%
Expected life in years \| yr	6.5	6.5
Expected volatility	60.00%	60.00%
Risk-free interest rate	3.02%	3.02%
Grant date fair value per share of option awards	$ 19.28	$ 19.28
August 2010 Grant [Member]
Stock Options Fair Value Assumptions
Grant date price per share of option award	$ 20.00	$ 20.00
Expected dividend yield per share	2.50%	2.50%
Expected life in years \| yr	6.5	6.5
Expected volatility	62.00%	62.00%
Risk-free interest rate	3.05%	3.05%
Grant date fair value per share of option awards	$ 9.82	$ 9.82
February 2010 Grant [Member]
Stock Options Fair Value Assumptions
Grant date price per share of option award	$ 28.10	$ 28.10
Expected dividend yield per share	2.50%	2.50%
Expected life in years \| yr	6.5	6.5
Expected volatility	62.00%	62.00%
Risk-free interest rate	3.05%	3.05%
Grant date fair value per share of option awards	$ 13.81	$ 13.81
February 2009 Grant [Member]
Stock Options Fair Value Assumptions
Grant date price per share of option award		$ 15.26
Expected dividend yield per share		2.50%
Expected life in years \| yr		6.5
Expected volatility		51.00%
Risk-free interest rate		2.05%
Grant date fair value per share of option awards		$ 6.19

Stock-Based Compensation (Stock Options Activity) (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012 USD ($) yr $ / shares shares	Dec. 31, 2011 USD ($) yr $ / shares shares
Stock Options Activity
Outstanding at Beginning \| shares	353,452	291,591
Granted \| shares	95,899	73,910
Exercised \| shares	(39,562)	(7,150)
Forfeited \| shares		(4,899)
Outstanding at End \| shares	409,789	353,452
Exercisable at End \| shares	183,419	95,568
Outstanding at Beginning, Weighted Average Exercise Price per Option \| $ / shares	$ 27.65	$ 24.63
Granted, Weighted Average Exercise Price per Option \| $ / shares	38.21	40.26
Exercised, Weighted Average Exercise Price per Option \| $ / shares	15.26	29.97
Forfeited, Weighted Average Exercise Price per Option \| $ / shares		34.64
Outstanding at End, Weighted Average Exercise Price per Option \| $ / shares	31.32	27.65
Exercisable at End, Weighted Average Exercise Price per Option \| $ / shares	$ 25.39	$ 34.70
Outstanding at End, Weighted Average Remaining Contractual Term (in years) \| yr	7.71	7.27
Exercisable at End, Weighted Average Remaining Contractual Term (in years) \| yr	6.04	5.51
Outstanding at End, Aggregate Intrinsic Value \| $	$ 3.2	$ 3.0
Exercisable at End, Aggregate Intrinsic Value \| $	$ 2.5	$ 0.2

Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation Expense
Selling, general and administrative expenses	$ 1.5	$ 0.8	$ 5.3	$ 3.3	$ 2.5
Less related income tax benefit	0.6	0.3	2.0	1.3	1.0
Decrease in net income attributable to Koppers	$ 0.9	$ 0.5	$ 3.3	$ 2.0	$ 1.5

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock-Based Compensation (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 29, 2012	Mar. 31, 2012 USD ($) mo	Dec. 31, 2011 USD ($) mo
Stock-based Compensation (Textual) [Abstract]
Percentage of performance stock units vested	59.50%	128.20%
Stock options, vesting period in years		3 years	3 years
Stock options, term in years		10 years	10 years
Future compensation expense related to non-vested stock-based compensation arrangements \| $		$ 13.5	$ 7.3
Future compensation expense, Weighted average period over which it is expected to be recognized in months \| mo		28	23
Minimum [Member]
Stock-based Compensation (Textual) [Abstract]
Percentage of target award the participants earn		0.00%	0.00%
Maximum [Member]
Stock-based Compensation (Textual) [Abstract]
Percentage of target award the participants earn		150.00%	150.00%

Segment Information (Summary Of Results Of Segment Operations) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Results of Segment Operations
Revenues from external customers	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Depreciation & amortization	6.8				6.4					48.8	28.1	24.8
Operating profit	29.2	$ (19.2)	$ 40.3	$ 37.1	21.3	$ 15.9	$ 33.5	$ 32.8	$ 16.8	79.0	99.0	94.9
Capital expenditures (including acquisitions)										33.8	65.4	20.2
Carbon Materials & Chemicals [Member]
Summary of Results of Segment Operations
Revenues from external customers	249.5				218.6					1,015.8	795.6	655.2
Intersegment revenues	30.0				27.5					95.2	97.2	91.5
Depreciation & amortization	4.1				4.3					39.3	18.7	17.5
Operating profit	20.5				14.1					45.4	77.6	58.5
Capital expenditures (including acquisitions)										23.0	44.9	10.7
Railroad & Utility Products [Member]
Summary of Results of Segment Operations
Revenues from external customers	131.4				122.9					523.1	449.9	469.2
Depreciation & amortization	2.7				2.1					9.5	9.4	7.3
Operating profit	9.1				7.5					34.8	23.0	38.2
Capital expenditures (including acquisitions)										10.2	20.2	8.5
Corporate [Member]
Summary of Results of Segment Operations
Operating profit	$ (0.4)				$ (0.3)					(1.2)	(1.6)	(1.8)
Capital expenditures (including acquisitions)										$ 0.6	$ 0.3	$ 1.0

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References + Details

Segment Information (Summary Of Assets And Goodwill By Segment) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Summary of Assets and Goodwill by Segment
Segment assets	$ 754.1	$ 730.7		$ 669.2
Cash and cash equivalents	42.6	54.1	$ 40.5	35.3	$ 58.4	$ 63.1
Income Taxes Receivable, Current	1.2	10.6		11.9
Deferred taxes		41.8		27.1
Deferred financing costs		8.2		9.1
Deferred charges		3.5		4.0
Other		6.6		6.4
Goodwill	73.0	72.1		72.1	$ 61.6
Carbon Materials & Chemicals [Member]
Summary of Assets and Goodwill by Segment
Segment assets	510.2	495.2		447.4
Goodwill	70.2	69.4		69.6
Railroad & Utility Products [Member]
Summary of Assets and Goodwill by Segment
Segment assets	185.1	164.6		154.8
Goodwill	2.8	2.7		2.5
All Other [Member]
Summary of Assets and Goodwill by Segment
Segment assets	$ 58.8	70.9
Segment Assets [Member]
Summary of Assets and Goodwill by Segment
Segment assets		659.8		602.2
Cash And Cash Equivalents [Member]
Summary of Assets and Goodwill by Segment
Cash and cash equivalents		$ 0.2		$ 8.5

Segment Information (Schedule Of Revenues And Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Revenues and Long-Lived Assets by Geographic Area
Revenues from external customers	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Long-lived assets		256.0				272.7				256.0	272.7	237.4
United States [Member]
Schedule of Revenues and Long-Lived Assets by Geographic Area
Revenues from external customers										857.8	672.5	649.1
Long-lived assets		161.6				157.1				161.6	157.1	149.1
Australia [Member]
Schedule of Revenues and Long-Lived Assets by Geographic Area
Revenues from external customers										349.4	276.9	239.4
Long-lived assets		58.7				79.8				58.7	79.8	73.4
Europe [Member]
Schedule of Revenues and Long-Lived Assets by Geographic Area
Revenues from external customers										248.0	194.0	144.1
Long-lived assets		35.7				35.8				35.7	35.8	14.9
Other Countries [Member]
Schedule of Revenues and Long-Lived Assets by Geographic Area
Revenues from external customers										83.7	102.1	91.8
Long-lived assets		$ 0.0				$ 0.0				$ 0.0	$ 0.0	$ 0.0

Segment Information (Schedule Of Segment Revenues For Significant Product Lines) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Segment Revenues for Significant Product Lines
Net sales	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Carbon Materials & Chemicals [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales	249.5				218.6					1,015.8	795.6	655.2
Carbon Materials & Chemicals [Member] \| Carbon Pitch [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										431.1	325.6	302.9
Carbon Materials & Chemicals [Member] \| Creosote And Carbon Black Feedstock [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										148.0	104.4	76.3
Carbon Materials & Chemicals [Member] \| Phthalic Anhydride [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										112.4	93.9	67.3
Carbon Materials & Chemicals [Member] \| Naphthalene [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										72.3	68.0	49.8
Carbon Materials & Chemicals [Member] \| Carbon Black [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										80.4	50.6	45.4
Carbon Materials & Chemicals [Member] \| Other Products [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										171.6	153.1	113.5
Railroad & Utility Products [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales	$ 131.4				$ 122.9					523.1	449.9	469.2
Railroad & Utility Products [Member] \| Railroad Crossties [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										324.9	282.5	298.1
Railroad & Utility Products [Member] \| Utility Poles [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										84.2	73.3	66.8
Railroad & Utility Products [Member] \| Creosote [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										52.7	57.9	60.6
Railroad & Utility Products [Member] \| Rail Joint Bars [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										24.7	0.1	0.0
Railroad & Utility Products [Member] \| Other Products [Member]
Schedule of Segment Revenues for Significant Product Lines
Net sales										$ 36.6	$ 36.1	$ 43.7

Segment Information (Narrative) (Details) $ in Millions	3 Months Ended									12 Months Ended
Segment Information (Narrative) (Details) $ in Millions	Mar. 31, 2012 USD ($) Segment	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2010 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Dec. 31, 2011 USD ($) Segment	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Segment Reporting Information [Line Items]
Depreciation										$ 46.0	$ 25.6	$ 22.8
Operating profit	$ 29.2	$ (19.2)	$ 40.3	$ 37.1	$ 21.3	$ 15.9	$ 33.5	$ 32.8	$ 16.8	79.0	99.0	94.9
Revenues from external customers	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	1,245.5	1,124.4
Segment Information (Textual) [Abstract]
Number of reportable segments \| Segment	2									2
Revenue percentage		11.00%								11.00%
Australia [Member]
Segment Reporting Information [Line Items]
Revenues from external customers										$ 349.4	276.9	239.4
Australia [Member] \| Carbon Black [Member]
Segment Reporting Information [Line Items]
Depreciation										20.2
Operating profit										41.0
Non United State Countries [Member]
Segment Reporting Information [Line Items]
Revenues from external customers										$ 681.1	$ 573.0	$ 475.3

Income Taxes (Summary Of Income Tax Provision) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal			$ 12.6	$ 10.0	$ (21.1)
State			1.0	0.4	0.1
Foreign			12.5	13.7	11.9
Total current tax provision (benefit)			26.1	24.1	(9.1)
Deferred:
Federal			(5.2)	4.1	22.7
State			0.1	0.3	(0.7)
Foreign			(6.1)	0.6	0.9
Total deferred tax provision	$ 2.0	$ 0.2	(11.3)	5.0	22.9
Total income tax provision	$ 7.2	$ 5.2	$ 14.9	$ 29.1	$ 13.8

Income Taxes (Summary Of Income Taxes Reconciled With The Federal Statutory Rates) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Income Taxes Reconciled with the Federal Statutory Rates
Federal income tax rate	35.00%		35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.40%	1.10%	1.30%	0.70%	(1.20%)
Foreign earnings taxed at different rates			(13.70%)	2.60%	5.20%
Domestic production activities deduction	(1.50%)	(1.30%)	(2.30%)	(0.70%)	0.00%
Non-deductible fines and penalties			0.30%	0.00%	1.10%
Deferred tax adjustments			0.20%	0.00%	(0.90%)
Change in tax contingency reserves	0.80%	0.90%	6.90%	0.20%	0.30%
Other			0.70%	1.70%	(0.70%)
Total effective tax rate	32.80%	36.30%	28.40%	39.50%	38.80%

Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Pension and other postretirement benefits obligations	$ 38.7	$ 30.9
Reserves, including insurance, environmental and deferred revenue	29.8	12.0
Net operating loss benefit	11.2	10.6
Accrued employee compensation	10.7	8.6
Asset retirement obligations	5.1	4.9
Book/tax inventory accounting differences	1.6	1.8
Capital loss benefit	1.5	2.0
Tax credits	0.4	0.3
Excess tax basis on Koppers Australia assets	0.2	0.9
Other	2.4	4.1
Valuation allowance	(10.2)	(11.4)
Total deferred tax assets	91.4	64.7
Deferred tax liabilities:
Tax over book depreciation and amortization	27.6	23.1
Unremitted earnings of foreign subsidiaries	6.1	5.9
Tax/book inventory accounting differences	1.7	1.9
Other	5.5	4.3
Total deferred tax liabilities	40.9	35.2
Net deferred tax assets	$ 50.5	$ 29.5

Income Taxes (Summary Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Unrecognized Tax Benefits
Balance at beginning of year	$ 6.5	$ 4.0	$ 4.0
Additions based on tax provisions related to the current year	4.0	0.4	0.5
Additions for tax provisions of prior years	0.0	2.6	0.0
Reductions as a result of a lapse of the applicable statute of limitations	(0.6)	(0.5)	(0.5)
Balance at end of year	$ 9.9	$ 6.5	$ 4.0

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Taxes (Textual) [Abstract]
Net operating losses			$ 11.2	$ 10.6
Income Taxes (Additional Textual) [Abstract]
Income before income taxes			8.1	51.2	$ 42.4
Undistributed earnings			94.0
Employee post-retirement benefit plans			9.2	0.6	$ (2.5)
Income tax benefit related to restricted stock and stock options				$ 0.2
Valuation allowance, operating loss carryforwards			8.7
Valuation allowance, capital loss			$ 1.5
Percentage of pretax income	32.80%	36.30%	28.40%	39.50%	38.80%
Net tax benefit included in income taxes, discrete items	$ 0.3
U.S. federal statutory rate	35.00%		35.00%	35.00%	35.00%
Effective income tax rate, taxes on foreign earnings differential	(3.50%)
Nondeductible expenses	0.60%	0.60%
State taxes	1.40%	1.10%	1.30%	0.70%	(1.20%)
Uncertain tax positions	0.80%	0.90%	6.90%	0.20%	0.30%
Domestic manufacturing deduction	(1.50%)	(1.30%)	(2.30%)	(0.70%)	0.00%
Unrecognized tax benefits with impact on the effective tax rate	$ 7.3		$ 7.1	$ 3.5
Unrecognized tax benefits	10.1		9.9	6.5	$ 4.0	$ 4.0
Interest expense and related penalties			0.2	0.2	$ 0.1
Accrued interest expense and penalties	$ 1.0		0.9	$ 0.7
State [Member]
Income Taxes (Textual) [Abstract]
Net operating losses			$ 14.3
Operating losses expiration			2014 to 2030
Foreign [Member]
Income Taxes (Textual) [Abstract]
Net operating losses			$ 2.0
Operating losses expiration			2019

Inventories (Components Of Inventories) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012
Components of Inventories
Raw materials	$ 91.5	$ 107.6	$ 105.2
Work in process	20.1	7.6	22.1
Finished goods	95.1	95.0	99.4
Inventory, gross	206.7	210.2	226.7
Less revaluation to LIFO	47.7	44.8	48.5
Net	159.0	165.4	$ 178.2
Inventories (Textual) [Abstract]
Increase in operating profit due to LIFO liquidations	$ 0.3	$ 1.2

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Property, Plant and Equipment
Property, plant and equipment, gross	$ 641.1	$ 634.8	$ 649.6
Less accumulated depreciation	487.4	479.2	481.4
Net	153.7	155.6	168.2
Land [Member]
Schedule of Property, Plant and Equipment
Property, plant and equipment, gross	6.7	6.6	7.6
Buildings [Member]
Schedule of Property, Plant and Equipment
Property, plant and equipment, gross	35.1	34.7	36.5
Machinery And Equipment [Member]
Schedule of Property, Plant and Equipment
Property, plant and equipment, gross	$ 599.3	$ 593.5	$ 605.5

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References + Details

Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property Plant and Equipment (Textual) [Abstract]
Depreciation	$ 46.0	$ 25.6	$ 22.8
Impairment charges	$ 20.2	$ 1.8

Pensions And Postretirement Benefit Plans (Schedule Of Net Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Net Benefit Cost
Service cost	$ 0.9	$ 0.8
Interest cost	2.8	2.9
Expected return on plan assets	(2.7)	(2.8)
Amortization of net loss	2.0	1.6
Amortization of transition asset	(0.1)	(0.1)
Net periodic benefit cost	2.9	2.4
Defined contribution plans expense	1.5	1.5	$ 4.8	$ 4.7	$ 2.5
Other postretirement benefit plan expense	0.2	0.2
Multi-employer contribution plan expense	$ 0.2	$ 0.2	0.7	0.7
Pension Benefits [Member]
Schedule of Net Benefit Cost
Service cost			3.3	3.1	2.8
Interest cost			11.1	11.4	10.8
Expected return on plan assets			(11.0)	(9.9)	(8.5)
Amortization of prior service cost			0.1	0.2	0.2
Amortization of net loss			6.3	5.2	6.3
Amortization of transition asset			(0.3)	(0.3)	(0.3)
Settlements and curtailments			0.2	0.5	0.0
Net periodic benefit cost			9.7	10.2	11.3
Other Benefits [Member]
Schedule of Net Benefit Cost
Service cost			0.2	0.2	0.2
Interest cost			0.6	0.7	0.8
Expected return on plan assets			0.0	0.0	0.0
Amortization of prior service cost			(0.1)	(0.1)	(0.3)
Amortization of net loss			0.0	0.0	0.0
Amortization of transition asset			0.0	0.0	0.0
Settlements and curtailments			0.0	0.0	0.0
Net periodic benefit cost			$ 0.7	$ 0.8	$ 0.7

Pensions And Postretirement Benefit Plans (Schedule Of Change In The Funded Status Of The Pension And Post-Retirement Plans) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Change in the Funded Status of the Pension and Post-Retirement Plans
Service cost	$ 0.9	$ 0.8
Interest cost	2.8	2.9
Fair value of plan assets at beginning of year	146.6	141.6	$ 141.6
Fair value of plan assets at end of year			146.6	$ 141.6
Noncurrent liabilities	104.8		104.1	86.1
Pension Benefits [Member]
Schedule of Change in the Funded Status of the Pension and Post-Retirement Plans
Benefit obligation at beginning of year	239.5	215.9	215.9	201.9
Service cost			3.3	3.1	$ 2.8
Interest cost			11.1	11.4	10.8
Plan participants' contributions			0.2	0.2
Actuarial losses (gains)			20.2	12.9
Settlements			(0.8)	(2.4)
Curtailments			0.0	(1.1)
Currency translation			(0.3)	(0.7)
Benefits paid			(10.2)	(9.4)
Benefit obligation at end of year			239.5	215.9	201.9
Fair value of plan assets at beginning of year	146.6	141.6	141.6	132.8
Actual return on plan assets			0.1	14.3
Employer contribution			15.9	6.3
Settlements			(0.8)	(2.4)
Currency translation			(0.2)	(0.2)
Fair value of plan assets at end of year			146.6	141.6	132.8
Funded status of the plan			(92.9)	(74.3)
Noncurrent assets			0.3	0.9
Current liabilities			0.7	0.6
Noncurrent liabilities			92.5	74.6
Benefit obligation			231.5	208.1
Fair value of plan assets			138.3	132.9
Accumulated benefit obligation			224.1	201.6
Fair value of plan assets with accumulated benefit obligation			138.3	132.9
Other Benefits [Member]
Schedule of Change in the Funded Status of the Pension and Post-Retirement Plans
Benefit obligation at beginning of year	12.5	12.8	12.8	13.6
Service cost			0.2	0.2	0.2
Interest cost			0.6	0.7	0.8
Plan participants' contributions			0.0	0.0
Actuarial losses (gains)			(0.5)	(0.5)
Settlements			0.0	0.0
Curtailments			0.0	0.0
Currency translation			0.0	0.0
Benefits paid			(0.5)	(1.2)
Benefit obligation at end of year			12.5	12.8	13.6
Fair value of plan assets at beginning of year	$ 0.0	$ 0.0	0.0	0.0
Actual return on plan assets			0.0	0.0
Employer contribution			0.5	1.2
Settlements			0.0	0.0
Currency translation			0.0	0.0
Fair value of plan assets at end of year			0.0	0.0	$ 0.0
Funded status of the plan			(12.5)	(12.8)
Noncurrent assets			0.0	0.0
Current liabilities			1.0	1.3
Noncurrent liabilities			$ 11.5	$ 11.5

Pensions And Postretirement Benefit Plans (Schedule Of Projected Benefit Payments) (Details) $ in Millions	Dec. 31, 2011 USD ($)
Pension Benefits [Member]
Schedule of Projected Benefit Payments
2012	$ 12.1
2013	10.8
2014	11.6
2015	11.9
2016	13.1
2017-2021	72.0
Other Benefits [Member]
Schedule of Projected Benefit Payments
2012	1.0
2013	0.9
2014	0.9
2015	0.9
2016	0.9
2017-2021	$ 4.6

Pensions And Postretirement Benefit Plans (Schedule Of Weighted-Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Schedule of Weighted-Average Assumptions
Discount rate	4.55%	5.28%
Expected return on plan assets	7.68%	7.65%
Rate of compensation increase	3.09%	3.10%
Other Benefits [Member]
Schedule of Weighted-Average Assumptions
Discount rate	4.37%	5.09%
Initial medical trend rate	7.80%	8.00%

Pensions And Postretirement Benefit Plans (Schedule Of Weighted Average Asset Allocation For The Company's Pension Plans) (Details)	Dec. 31, 2011	Dec. 31, 2010
Schedule of Weighted Average Asset Allocation for the Company's Pension Plans
Equity securities	64.00%	67.00%
Debt securities	30.00%	27.00%
Other	6.00%	6.00%
Total asset allocation	100.00%	100.00%

Pensions And Postretirement Benefit Plans (Schedule Of Pension Plan Assets At Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	$ 146.6	$ 141.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	146.6	141.6
Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
U.S. Equity Securities [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	71.8	70.3
U.S. Equity Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
U.S. Equity Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	71.8	70.3
U.S. Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
International Equity Securities [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	22.6	25.3
International Equity Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
International Equity Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	22.6	25.3
International Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
U.S. Debt Securities [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	22.0	18.5
U.S. Debt Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
U.S. Debt Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	22.0	18.5
U.S. Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
International Debt Securities [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	22.4	19.3
International Debt Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
International Debt Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	22.4	19.3
International Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
Real Estate and Other Investments [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	1.6	1.6
Real Estate and Other Investments [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
Real Estate and Other Investments [Member] \| Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	1.6	1.6
Real Estate and Other Investments [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
Cash And Cash Equivalents [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	6.2	6.6
Cash And Cash Equivalents [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	0.0	0.0
Cash And Cash Equivalents [Member] \| Significant Observable Inputs (Level 2) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	6.2	6.6
Cash And Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Schedule of Pension Plan Assets at Fair Value
Fair value of pension plan assets	$ 0.0	$ 0.0

Pensions And Postretirement Benefit Plans (Schedule Of Health Care Cost Trend Rates) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Schedule of Health Care Cost Trend Rates
Postretirement benefit expense one-percentage increase	$ 0.0
Postretirement benefit expense one-percentage decrease	0.0
Postretirement benefit liability one-percentage increase	0.3
Postretirement benefit liability one-percentage decrease	$ (0.3)

Pensions And Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pensions and Post Retirement Benefit Plans (Additional Textual) [Abstract]
Defined contribution plans expense	$ 1.5	$ 1.5	$ 4.8	$ 4.7	$ 2.5
Multi-employer contribution plan expense	$ 0.2	$ 0.2	0.7	0.7
Amortization of prior service cost			0.1
Amortization of net loss			8.1
Amortization of transition asset			(0.3)
Accumulated benefit obligation pension plans			$ 231.5	209.4
Time horizon of return on assets allocation, in years			20 years
Operating expense			$ 5.6	$ 5.0	$ 4.5
Pension Benefits [Member]
Pensions and Post Retirement Benefit Plans (Textual) [Abstract]
Expected contributions by the employer			$ 12.9
Expected return on plan assets			7.68%	7.65%
Other Benefits [Member]
Pensions and Post Retirement Benefit Plans (Textual) [Abstract]
Expected contributions by the employer			$ 1.0
Initial health care cost trend rate			7.80%	8.00%
Growth Seeking Assets [Member]
Pensions and Post Retirement Benefit Plans (Textual) [Abstract]
Target allocation investment strategy, minimum			50.00%
Target allocation investment strategy, maximum			75.00%
Income Generating Assets [Member]
Pensions and Post Retirement Benefit Plans (Textual) [Abstract]
Target allocation investment strategy, minimum			25.00%
Target allocation investment strategy, maximum			50.00%
Minimum [Member]
Pensions and Post Retirement Benefit Plans (Textual) [Abstract]
Initial health care cost trend rate			4.50%

Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of debt
Revolving Credit Facility	$ 18.5	$ 6.4	$ 0.0
Senior Notes	295.8	295.7	295.3
Other debt, including capital leases		0.0	1.1
Total debt	314.3	302.1	296.4
Less short-term debt and current maturities of long-term debt	0.0	0.0	1.0
Long-term debt (excluding current portion)	$ 314.3	$ 302.1	$ 295.4
Revolving Credit Facility [Member]
Schedule of debt
Debt, Weighted Average Interest Rate	3.41%	2.55%
Debt, maturity date	2015	2015
Senior Notes [Member]
Schedule of debt
Long-term debt (excluding current portion)		$ 295.0
Debt, Weighted Average Interest Rate	7.875%	7.875%
Debt, maturity date	2019	2019
Other Debt, Including Capital Leases [Member]
Schedule of debt
Debt, Weighted Average Interest Rate		0.00%

Debt (Schedule Of Debt Maturities) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of debt maturities
2012		$ 0.0
2013		0.0
2014		0.0
2015		6.4
2016		0.0
Thereafter		300.0
Total maturities		306.4
Future accretion on Senior Notes		(4.3)
Total debt	$ 314.3	$ 302.1	$ 296.4

Debt (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Millions	Oct. 31, 2009	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 01, 2009
Debt (Textual) [Abstract]
Loss on extinguishment of debt				$ 0.0	$ 0.0	$ (22.4)
Accumulated amortization				3.4	2.1
Debt (Additional Textual) [Abstract]
Unamortized deferred financing costs				8.2	9.1
Revolving Credit Facility [Member]
Debt (Textual) [Abstract]
Line of credit facility, borrowing capacity		$ 300.0		300.0
Line of credit facility, commitment fees		0.3	$ 0.3	1.1	$ 1.3	$ 1.8
Debt instrument, unused borrowing capacity		263.6		275.8
Letters of credit, amount outstanding		$ 9.9		$ 14.2
Debt, weighted average interest rate		3.41%		2.55%
Debt, maturity date		2015		2015
Senior Notes [Member]
Debt (Textual) [Abstract]
Debt, weighted average interest rate		7.875%		7.875%
Debt instrument, issuance date		December 1, 2009		December 1, 2009
Debt, maturity date		2019		2019
Debt instrument, offering price percentage		98.311%		98.311%
Debt instrument, offering value		$ 294.9		$ 294.9
Debt instrument, face amount		$ 300.0		$ 300.0			$ 300.0
Debt instrument, effective interest rate		8.125%		8.125%
Debt instrument, redemption price percentage		103.938%		103.938%
Senior Discount Notes [Member]
Debt (Textual) [Abstract]
Debt, maturity date						2014
Debt instrument, face amount						$ 203.0
Debt instrument, effective interest rate						9.875%
Loss on extinguishment of debt						$ 13.2
Bond premium						10.0
Accumulated amortization						2.6
Bond tender expense						0.6
Interest Rate Swap [Member]
Debt (Textual) [Abstract]
Notional fixed-interest rate debt						$ 50.0
Swap was terminated which resulted in a gain	$ 1.6
Senior Secured Notes [Member]
Debt (Textual) [Abstract]
Debt, maturity date						2013
Debt instrument, effective interest rate						9.875%
Loss on extinguishment of debt						$ 9.2
Bond premium						6.1
Accumulated amortization						$ 3.1

Asset Retirement Obligations (Schedule Of Change In Asset Retirement Obligation) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Summary of Asset Retirement Obligation Liabilities
Asset retirement obligation at beginning of year	$ 21.3	$ 17.0	$ 17.0	$ 16.6
Accretion expense	0.2	1.1	1.1	1.3
Revision in estimated cash flows	0.1	6.3	6.3	1.5
Expenses incurred	(0.4)	(3.1)
Currency translation	0.2	0.0	0.0	(0.3)
Asset retirement obligation at end of year	$ 21.4	$ 21.3	$ 21.3	$ 17.0

Deferred Revenue From Extended Product Warranty Liabilities (Schedule Of Deferred Revenue From Extended Product Warranty Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Summary of Changes to Deferred Revenue
Deferred revenue at beginning of year	$ 4.8	$ 5.7	$ 5.7	$ 6.7
Revenue earned	(0.2)	(0.9)	(0.9)	(1.0)
Deferred revenue at end of year	$ 4.6	$ 4.8	$ 4.8	$ 5.7

Commitments and Contingent Liabilities (Changes In Accrued Liability For Legal Proceedings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Changes in Accrued Liability for Legal Proceedings
Balance at beginning of year	$ 3.0	$ 0.0
Accrual of reserves	0.0	3.0
Cash expenditures	(3.0)	0.0
Balance at ending of year	$ 0.0	$ 3.0

Commitments and Contingent Liabilities (Changes In Accrued Liability For Environmental Matters) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Changes in Accrued Liability for Environmental Matters
Balance at beginning of year	$ 17.7	$ 6.6	$ 6.6	$ 10.7
Expense	0.6	8.0	8.0	1.2
Reversal of reserves	(0.1)	(1.6)	(1.6)	(4.3)
Cash expenditures	(2.3)	(2.4)	(2.4)	(1.5)
Assumed remediation liability in exchange for cash	0.0	7.5	7.5	0.0
Currency translation	0.3	(0.4)	(0.4)	0.5
Balance at end of year	$ 16.2	$ 17.7	$ 17.7	$ 6.6

Commitments and Contingent Liabilities (Narrative) (Details)	1 Months Ended		3 Months Ended			12 Months Ended
	Mar. 31, 2010 USD ($)	Jul. 31, 2004 USD ($)	Mar. 31, 2012 USD ($) lawsuits Plaintiffs	Dec. 31, 2011 USD ($) lawsuits Plaintiffs	Mar. 31, 2011 USD ($)	Dec. 31, 2011 USD ($) lawsuits Plaintiffs	Dec. 31, 2010 USD ($) lawsuits Plaintiffs	Feb. 18, 2012 T	Dec. 31, 2009 USD ($)
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of plaintiffs \| Plaintiffs			131	131		131	111
Number of cases \| lawsuits			74	73		73	62
Compensatory damages			$ 1,000,000
Litigation expense							$ 3,000,000
Environmental legal indemnification expense		$ 7,000,000
Environmental remediation costs paid by others			15,000,000			$ 15,000,000
Environmental remediation reserve			600,000		$ 8,000,000	8,000,000	1,200,000
Accrual for environmental loss contingencies			16,200,000	$ 17,700,000	17,700,000	17,700,000	$ 6,600,000		$ 10,700,000
Reduction to reserve due to sale of property	$ (2,900,000)
Accrued liability for environmental matters, current			$ 6,500,000	$ 8,100,000		$ 8,100,000
Compensatory Damages [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			74
Punitive Damages [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			65
Gainesville Plant [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of plaintiffs \| Plaintiffs				3		3
Joint motion proceeding, stay days granted			120 days
Number of new defendants						26
Portland, Victoria, Australia [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			2
Environmental remediation expense			$ 1,700,000
Volume of leak \| T								400
Stickney, Illinois [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Accrual for environmental loss contingencies			300,000
Australia Sites [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Accrual for environmental loss contingencies			$ 1,300,000
Pennsylvania [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			67	66		66
Arkansas [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			4	4		4
Tennessee [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			1	1		1
Compensatory damages			$ 15,000,000			$ 15,000,000
Indiana [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			1	1		1
Illinois [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Number of cases \| lawsuits			1	1		1
Australia [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Environmental remediation expense			$ 6,900,000	$ 6,700,000		$ 1,600,000
Amount contributable by third party				7,500,000		7,500,000
Net amount contributed by third party			4,200,000	4,000,000		4,000,000
Environmental remediation reserve	$ 1,300,000			8,000,000	$ 6,000,000
Domestic [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Estimate of remediation expense by others			100,000,000			100,000,000
Environmental contingencies company has not provided a reserve			600,000	$ 700,000		700,000
Environmental remediation reserve						300,000
Minimum [Member] \| Arkansas [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Compensatory damages			50,000			50,000
Minimum [Member] \| Illinois [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Compensatory damages			50,000			$ 50,000
Inventory Losses [Member] \| Portland, Victoria, Australia [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Environmental remediation expense			400,000
Emergency Response Expense [Member] \| Portland, Victoria, Australia [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Environmental remediation expense			500,000
Incremental Logistics Expenses [Member] \| Portland, Victoria, Australia [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Environmental remediation expense			400,000
Estimated Material Clean Up and Removal Expenses [Member] \| Portland, Victoria, Australia [Member]
Commitments and Contingent Liabilities (Textual) [Abstract]
Environmental remediation expense			$ 400,000

Subsidiary Guarantor Information for Koppers Inc. Senior Notes (Schedule Of Subsidiary Guarantor Information For Senior Notes Condensed Consolidating Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	18.0				17.7					75.2	63.3	58.1
Operating profit	29.2	(19.2)	40.3	37.1	21.3	15.9	33.5	32.8	16.8	79.0	99.0	94.9
Other income (expense)	0.7				0.0					0.7	1.9	(0.7)
Interest expense (income)	6.9				6.9					27.2	27.1	36.3
Income taxes	7.2				5.2					14.9	29.1	13.8
Income from continuing operations	15.8	(14.0)	22.7	19.9	9.2	5.2	15.8	16.3	7.4	37.6	44.7	21.7
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	15.6	$ (14.2)	$ 22.4	$ 19.8	8.9	$ 5.1	$ 15.6	$ 16.1	$ 7.3	36.9	44.1	18.8
Comprehensive income attributable to Koppers	22.3				16.6					18.9	54.6	43.5
Parent [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Koppers Inc. [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Domestic Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Consolidating Adjustments [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Koppers Inc. Senior Notes [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	380.9				341.5					1,538.9	1,245.5	1,124.4
Cost of sales including depreciation and amortization	333.7				302.5					1,384.7	1,083.2	971.4
Selling, general and administrative	18.0				17.7					75.2	63.3	58.1
Operating profit	29.2				21.3					79.0	99.0	94.9
Other income (expense)	0.7				0.0					0.7	1.9	(0.7)
Interest expense (income)	6.9				6.9					27.2	27.1	58.7
Income taxes	7.2				5.2					14.9	29.1	13.8
Income from continuing operations	15.8				9.2					37.6	44.7	21.7
Discontinued operations	0.1				(0.2)					0.0	(0.2)	(0.3)
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	15.6				8.9					36.9	44.1	18.8
Comprehensive income attributable to Koppers	22.3				16.6
Koppers Inc. Senior Notes [Member] \| Parent [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					(7.8)	0.0	0.0
Selling, general and administrative	0.4				0.3					1.2	1.6	1.8
Operating profit	(0.4)				(0.3)					6.6	(1.6)	(1.8)
Other income (expense)	15.9				9.0					29.9	45.0	40.2
Interest expense (income)	0.1				(0.1)					0.0	(0.2)	31.1
Income taxes	(0.2)				(0.1)					(0.4)	(0.5)	(11.5)
Income from continuing operations	15.6				8.9					36.9	44.1	18.8
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	15.6				8.9					36.9	44.1	18.8
Comprehensive income attributable to Koppers	22.3				16.6
Koppers Inc. Senior Notes [Member] \| Koppers Inc. [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	211.8				189.2					854.1	721.2	709.1
Cost of sales including depreciation and amortization	189.4				175.9					762.9	657.7	640.9
Selling, general and administrative	10.5				9.6					41.6	32.2	28.8
Operating profit	11.9				3.7					49.6	31.3	39.4
Other income (expense)	0.0				0.0					0.3	0.2	0.5
Interest expense (income)	6.8				6.9					27.5	27.9	28.5
Income taxes	5.1				2.2					7.7	1.5	2.0
Income from continuing operations	0.0				(5.4)					14.7	2.1	9.4
Discontinued operations	(0.1)				0.1					0.0	0.0	(0.3)
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	(0.1)				(5.3)					14.7	2.1	9.1
Comprehensive income attributable to Koppers	1.1				(4.4)
Koppers Inc. Senior Notes [Member] \| Domestic Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	22.4				18.9					72.6	45.8	33.0
Cost of sales including depreciation and amortization	16.3				13.5					41.6	19.1	(3.7)
Selling, general and administrative	0.4				0.5					1.8	3.3	3.0
Operating profit	5.7				4.9					29.2	23.4	33.7
Other income (expense)	0.3				0.0					0.0	(0.4)	(0.3)
Interest expense (income)	0.0				0.0					(0.1)	0.0	0.0
Income taxes	0.1				0.0					0.8	12.2	11.0
Income from continuing operations	5.9				4.9					28.5	10.8	22.4
Discontinued operations	0.0				0.0					0.0	(0.2)	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	5.9				4.9					28.5	10.6	22.4
Comprehensive income attributable to Koppers	7.7				5.8
Koppers Inc. Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	163.2				145.1					657.9	517.3	422.3
Cost of sales including depreciation and amortization	143.0				123.3					612.3	432.0	350.4
Selling, general and administrative	6.7				7.3					30.6	26.2	24.5
Operating profit	13.5				14.5					15.0	59.1	47.4
Other income (expense)	0.4				0.0					0.4	2.1	(0.9)
Interest expense (income)	1.5				1.4					5.4	4.4	4.1
Income taxes	2.2				3.1					6.8	15.9	12.3
Income from continuing operations	10.2				10.0					3.2	40.9	30.1
Discontinued operations	0.2				(0.3)					0.0	0.0	0.0
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	10.1				9.6					2.5	40.5	27.5
Comprehensive income attributable to Koppers	13.8				15.5
Koppers Inc. Senior Notes [Member] \| Consolidating Adjustments [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Statement of Income
Net sales	(16.5)				(11.7)					(45.7)	(38.8)	(40.0)
Cost of sales including depreciation and amortization	(15.0)				(10.2)					(24.3)	(25.6)	(16.2)
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	(1.5)				(1.5)					(21.4)	(13.2)	(23.8)
Other income (expense)	(15.9)				(9.0)					(29.9)	(45.0)	(40.2)
Interest expense (income)	(1.5)				(1.3)					(5.6)	(5.0)	(5.0)
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	(15.9)				(9.2)					(45.7)	(53.2)	59.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	(15.9)				(9.2)					$ (45.7)	$ (53.2)	$ (59.0)
Comprehensive income attributable to Koppers	$ (22.6)				$ (16.9)

Subsidiary Guarantor Information for Koppers Inc. Senior Notes (Schedule Of Subsidiary Guarantor Information For Senior Notes Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	$ 42.6	$ 54.1	$ 40.5	$ 35.3	$ 58.4	$ 63.1
S-T investments & restricted cash				0.0
Accounts receivable, net	191.2	160.9		128.9
Inventories, net	178.2	159.0		165.4
Deferred tax assets	9.6	9.3		5.9
Other current assets	20.2	21.8		23.0
Total current assets	454.7	427.4		370.4
Equity investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1	61.6
Deferred tax assets	41.5	44.3		26.1
Other noncurrent assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Accounts payable	96.6	102.1		87.9
Accrued liabilities	60.9	63.1		55.4
Short-term debt and current portion of long-term debt	0.0	0.0		1.0
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Other long-term liabilities	46.7	46.9		38.4
Total liabilities	628.9	623.5		569.3
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	754.1	730.7		669.2
Parent [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Koppers Inc. [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Domestic Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Non-Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Consolidating Adjustments [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Koppers Inc. Senior Notes [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	42.6	54.1	40.5	35.3	58.4	63.1
S-T investments & restricted cash				0.0
Accounts receivable, net	192.4	171.5		140.8
Inventories, net	178.2	159.0		165.4
Deferred tax assets	9.6	9.3		5.9
Other current assets	31.9	33.5		23.0
Total current assets	454.7	427.4		370.4
Equity investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1
Deferred tax assets	41.5	44.3		26.1
Other noncurrent assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Accounts payable	96.6	102.1		87.9
Accrued liabilities	66.5	68.3		60.5
Short-term debt and current portion of long-term debt		0.0		1.0
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Other long-term liabilities	151.5	151.0		124.5
Total liabilities	628.9	623.5		569.3
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	754.1	730.7		669.2
Koppers Inc. Senior Notes [Member] \| Parent [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.2	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	5.8	5.5		16.6
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	5.8	5.5		16.6
Equity investments	111.7	93.9		76.7
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	117.5	99.4		93.3
Accounts payable	0.1	0.1		0.0
Accrued liabilities	4.9	4.5		4.6
Short-term debt and current portion of long-term debt		0.0		0.0
Total current liabilities	5.0	4.6		4.6
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	5.0	4.6		4.6
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	117.5	99.4		93.3
Koppers Inc. Senior Notes [Member] \| Koppers Inc. [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	8.4	12.9	37.5
S-T investments & restricted cash				0.0
Accounts receivable, net	113.1	112.6		80.3
Inventories, net	99.0	74.8		78.3
Deferred tax assets	10.9	10.7		7.4
Other current assets	7.2	6.8		6.9
Total current assets	230.2	204.9		181.3
Equity investments	77.1	77.1		77.1
Property, plant and equipment, net	100.3	102.0		94.7
Goodwill	39.8	39.8		39.5
Deferred tax assets	41.2	43.7		65.4
Other noncurrent assets	17.7	18.4		21.6
Total assets	506.3	485.9		479.6
Accounts payable	353.4	344.5		492.5
Accrued liabilities	30.2	27.2		(6.3)
Short-term debt and current portion of long-term debt		0.0		0.1
Total current liabilities	383.6	371.7		486.3
Long-term debt	413.0	400.8		295.4
Other long-term liabilities	116.6	116.5		99.6
Total liabilities	913.2	889.0		881.3
Total Koppers shareholders' equity	(406.9)	(403.1)		(401.7)
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	506.3	485.9		479.6
Koppers Inc. Senior Notes [Member] \| Domestic Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	301.3	284.0		460.9
Inventories, net	0.0	0.0		1.2
Deferred tax assets	(1.5)	(1.5)		(1.5)
Other current assets	0.3	0.3		0.3
Total current assets	300.1	282.8		460.9
Equity investments	26.5	26.3		26.2
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	(10.5)	(10.5)		(43.8)
Other noncurrent assets	126.9	131.3		0.0
Total assets	443.0	429.9		443.3
Accounts payable	15.3	9.6		15.1
Accrued liabilities	(0.9)	(0.6)		34.8
Short-term debt and current portion of long-term debt		0.0		0.0
Total current liabilities	14.4	9.0		49.9
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	2.5	2.5		3.0
Total liabilities	16.9	11.5		52.9
Total Koppers shareholders' equity	426.1	418.4		390.4
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	443.0	429.9		443.3
Koppers Inc. Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	42.6	54.1	40.5	26.9	45.3	25.6
S-T investments & restricted cash				0.0
Accounts receivable, net	100.2	79.2		107.2
Inventories, net	79.3	84.2		85.9
Deferred tax assets	0.2	0.1		0.0
Other current assets	24.4	26.4		15.8
Total current assets	246.7	244.0		235.8
Equity investments	4.2	3.9		3.8
Property, plant and equipment, net	53.4	53.6		73.5
Goodwill	33.2	32.3		32.6
Deferred tax assets	10.8	11.1		4.5
Other noncurrent assets	44.0	44.4		6.2
Total assets	392.3	389.3		356.4
Accounts payable	55.5	57.5		104.5
Accrued liabilities	32.3	37.4		27.4
Short-term debt and current portion of long-term debt		0.0		0.9
Total current liabilities	87.8	94.9		132.8
Long-term debt	64.5	69.0		0.0
Other long-term liabilities	32.4	32.0		21.9
Total liabilities	184.7	195.9		154.7
Total Koppers shareholders' equity	194.9	181.0		190.5
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	392.3	389.3		356.4
Koppers Inc. Senior Notes [Member] \| Consolidating Adjustments [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	$ 0.0	0.0	$ 0.0	$ 0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	(328.0)	(309.8)		(524.2)
Inventories, net	(0.1)	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	(328.1)	(309.8)		(524.2)
Equity investments	(214.1)	(196.3)		(179.1)
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	(162.8)	(167.7)		(0.1)
Total assets	(705.0)	(673.8)		(703.4)
Accounts payable	(327.7)	(309.8)		(524.2)
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt		0.0		0.0
Total current liabilities	(327.7)	(309.8)		(524.2)
Long-term debt	(163.2)	(167.7)		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	(490.9)	(477.5)		(524.2)
Total Koppers shareholders' equity	(214.1)	(196.3)		(179.2)
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	$ (705.0)	$ (673.8)		$ (703.4)

Subsidiary Guarantor Information for Koppers Inc. Senior Notes (Schedule Of Subsidiary Guarantor Information For Senior Notes Condensed Consolidating Cash Flow) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	$ (15.8)	$ (9.5)	$ 76.9	$ 105.3	$ 112.3
Capital expenditures and acquisitions	(3.4)	(4.4)	(33.2)	(29.9)	(18.0)
Loan to related party			(11.7)	0.0	0.0
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.8	2.0	(0.6)
Net cash (used in) investing activities	(3.2)	(5.0)	(44.7)	(63.4)	(20.8)
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs	0.0	(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	(4.5)	(4.5)	(18.2)	(23.1)	(18.0)
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	6.5	18.6	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0	1.1	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)	5.2	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1	35.3	35.3	58.4	63.1
Cash and cash equivalents at end of year	42.6	40.5	54.1	35.3	58.4
Parent [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Koppers Inc. [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Domestic Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Consolidating Adjustments [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Koppers Inc. Senior Notes [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	(15.8)	(9.5)	76.9	105.3	112.3
Capital expenditures and acquisitions	(3.4)	5.0	(33.8)	(65.4)	(20.2)
Loan to related party			(11.7)
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.8	2.0	(0.6)
Net cash (used in) investing activities	(3.2)	(5.0)	(44.7)	(63.4)	(20.8)
Borrowings (repayments) of long-term debt	12.1	23.6	5.4	(40.2)	(70.8)
Deferred financing costs		(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	(4.5)	4.5	(18.2)	(23.1)	(18.0)
Stock issued (repurchased)	(1.1)	0.0		(0.6)
Net cash provided by (used in) financing activities	6.5	18.6	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0	1.1	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)	5.2	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1	35.3	35.3	58.4	63.1
Cash and cash equivalents at end of year	42.6	40.5	54.1	35.3	58.4
Koppers Inc. Senior Notes [Member] \| Parent [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	5.6	4.6	18.1	18.7	231.8
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	(0.1)	0.0	0.0	(213.6)
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	(4.5)	4.5	(18.1)	(18.1)	(18.0)
Stock issued (repurchased)	(1.1)	0.0		(0.8)
Net cash provided by (used in) financing activities	(5.6)	(4.6)	(18.1)	(18.9)	(231.6)
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	(0.2)	0.2
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.2	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.2
Koppers Inc. Senior Notes [Member] \| Koppers Inc. [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	(9.4)	(28.7)	9.5	75.2	90.7
Capital expenditures and acquisitions	(2.7)	3.6	(24.5)	(35.0)	(15.0)
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.7	0.2	(0.7)
Net cash (used in) investing activities	(2.7)	(3.6)	(23.8)	(34.8)	(15.7)
Borrowings (repayments) of long-term debt	12.1	24.5	6.3	(40.2)	142.8
Deferred financing costs		(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	0.0	0.0	0.0	(4.5)	(232.7)
Stock issued (repurchased)	0.0	0.0		0.2
Net cash provided by (used in) financing activities	12.1	24.0	5.8	(44.9)	(98.0)
Effect of exchange rates on cash	0.0	(0.1)	0.1	0.0	(1.6)
Net increase (decrease) in cash and cash equivalents	0.0	(8.4)	(8.4)	(4.5)	(24.6)
Cash and cash equivalents at beginning of year	0.0	8.4	8.4	12.9	37.5
Cash and cash equivalents at end of year	0.0	0.0	0.0	8.4	12.9
Koppers Inc. Senior Notes [Member] \| Domestic Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Koppers Inc. Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	(12.0)	14.6	49.3	15.9	22.5
Capital expenditures and acquisitions	(0.7)	1.4	(9.3)	(30.4)	(5.2)
Loan to related party			(11.7)
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.1	1.8	0.1
Net cash (used in) investing activities	(0.5)	(1.4)	(20.9)	(28.6)	(5.1)
Borrowings (repayments) of long-term debt	0.0	(0.8)	(0.9)	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	(0.1)	(5.0)	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	(0.8)	(1.0)	(5.0)	0.0
Effect of exchange rates on cash	1.0	1.2	(0.2)	(0.7)	2.3
Net increase (decrease) in cash and cash equivalents	(11.5)	13.6	27.2	(18.4)	19.7
Cash and cash equivalents at beginning of year	54.1	26.9	26.9	45.3	25.6
Cash and cash equivalents at end of year	42.6	40.5	54.1	26.9	45.3
Koppers Inc. Senior Notes [Member] \| Consolidating Adjustments [Member]
Schedule of Subsidiary Guarantor Information for Senior Notes Condensed Consolidating Cash Flow
Cash provided by (used in) operating activities	0.0	0.0	0.0	(4.5)	(232.7)
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	4.5	232.7
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	4.5	232.7
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Subsidiary Guarantor Information for Koppers Inc. Senior Notes (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 01, 2009
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 300.0	$ 300.0	$ 300.0

Subsidiary Guarantor Information for Shelf Registration (Condensed Consolidating Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Consolidating Statement of Income
Net sales	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	18.0				17.7					75.2	63.3	58.1
Operating profit	29.2	(19.2)	40.3	37.1	21.3	15.9	33.5	32.8	16.8	79.0	99.0	94.9
Other income (expense)	0.7				0.0					0.7	1.9	(0.7)
Interest expense (income)	6.9				6.9					27.2	27.1	36.3
Income taxes	7.2				5.2					14.9	29.1	13.8
Income from continuing operations	15.8	(14.0)	22.7	19.9	9.2	5.2	15.8	16.3	7.4	37.6	44.7	21.7
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	15.6	$ (14.2)	$ 22.4	$ 19.8	8.9	$ 5.1	$ 15.6	$ 16.1	$ 7.3	36.9	44.1	18.8
Comprehensive income attributable to Koppers	22.3				16.6					18.9	54.6	43.5
Parent [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Koppers Inc. [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Consolidating Adjustments [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Shelf Registration [Member]
Condensed Consolidating Statement of Income
Net sales	380.9				341.5					1,538.9	1,245.5	1,124.4
Cost of sales including depreciation and amortization	333.7				302.5					1,384.7	1,083.2	971.4
Selling, general and administrative	18.0				17.7					75.2	63.3	58.1
Operating profit	29.2				21.3					79.0	99.0	94.9
Other income (expense)	0.7				0.0					0.7	1.9	(0.7)
Interest expense (income)	6.9				6.9					27.2	27.1	58.7
Income taxes	7.2				5.2					14.9	29.1	13.8
Income from continuing operations	15.8				9.2					37.6	44.7	21.7
Discontinued operations	0.1				(0.2)					0.0	(0.2)	(0.3)
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	15.6				8.9					36.9	44.1	18.8
Comprehensive income attributable to Koppers	22.3				16.6
Shelf Registration [Member] \| Parent [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					(7.8)	0.0	0.0
Selling, general and administrative	0.4				0.3					1.2	1.6	1.8
Operating profit	(0.4)				(0.3)					6.6	(1.6)	(1.8)
Other income (expense)	15.9				9.0					29.9	45.0	40.2
Interest expense (income)	0.1				(0.1)					0.0	(0.2)	31.1
Income taxes	(0.2)				(0.1)					(0.4)	(0.5)	(11.5)
Income from continuing operations	15.6				8.9					36.9	44.1	18.8
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	15.6				8.9					36.9	44.1	18.8
Comprehensive income attributable to Koppers	22.3				16.6
Shelf Registration [Member] \| Koppers Inc. [Member]
Condensed Consolidating Statement of Income
Net sales	211.8				189.2					854.1	721.2	709.1
Cost of sales including depreciation and amortization	189.4				175.9					762.3	657.7	640.9
Selling, general and administrative	10.5				9.6					41.6	32.2	28.8
Operating profit	11.9				3.7					50.2	31.3	39.4
Other income (expense)	0.0				0.0					(0.3)	0.2	0.5
Interest expense (income)	6.8				6.9					27.5	27.9	28.5
Income taxes	5.1				2.2					7.7	1.5	2.0
Income from continuing operations	0.0				(5.4)					14.7	2.1	9.4
Discontinued operations	(0.1)				0.1					0.0	0.0	(0.3)
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	(0.1)				(5.3)					14.7	2.1	9.1
Comprehensive income attributable to Koppers	1.1				(4.4)
Shelf Registration [Member] \| Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	22.4				18.9					72.6	45.8	33.0
Cost of sales including depreciation and amortization	16.3				13.6					41.6	19.3	(3.7)
Selling, general and administrative	0.4				0.5					1.8	3.3	3.0
Operating profit	5.7				4.8					29.2	23.2	33.7
Other income (expense)	0.3				0.0					0.0	(0.4)	(0.3)
Interest expense (income)	0.0				0.0					0.0	(0.1)	0.0
Income taxes	0.1				0.0					0.8	12.2	11.0
Income from continuing operations	5.9				4.8					28.4	10.7	22.4
Discontinued operations	0.0				0.0					0.0	(0.2)	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	5.9				4.8					28.4	10.5	22.4
Comprehensive income attributable to Koppers	7.7				5.7
Shelf Registration [Member] \| Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	52.1				90.2					431.3	366.7	355.6
Cost of sales including depreciation and amortization	41.2				73.5					407.9	295.2	296.0
Selling, general and administrative	2.5				5.1					20.0	19.5	20.5
Operating profit	8.4				11.6					3.4	52.0	39.1
Other income (expense)	0.0				(0.1)					(0.2)	1.7	0.4
Interest expense (income)	1.1				1.3					5.3	5.2	4.2
Income taxes	2.0				2.9					(0.3)	13.4	10.1
Income from continuing operations	5.3				7.3					(1.8)	35.1	25.2
Discontinued operations	0.2				(0.3)					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	5.5				7.0					(1.8)	35.1	25.2
Comprehensive income attributable to Koppers	8.9				13.0
Shelf Registration [Member] \| Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	113.1				56.1					264.6	156.1	79.3
Cost of sales including depreciation and amortization	103.7				50.4					221.3	140.4	67.0
Selling, general and administrative	4.2				2.2					10.6	6.7	4.0
Operating profit	5.2				3.5					32.7	9.0	8.3
Other income (expense)	0.4				0.1					1.2	0.4	(1.3)
Interest expense (income)	0.5				0.6					1.1	1.0	(0.1)
Income taxes	0.2				0.2					7.1	2.5	2.2
Income from continuing operations	4.9				2.8					25.7	5.9	4.9
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	4.6				2.7					25.0	5.5	2.3
Comprehensive income attributable to Koppers	5.8				3.6
Shelf Registration [Member] \| Consolidating Adjustments [Member]
Condensed Consolidating Statement of Income
Net sales	(18.5)				(12.9)					(83.7)	(44.3)	(52.6)
Cost of sales including depreciation and amortization	(16.9)				(10.9)					(40.6)	(29.4)	(28.8)
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	(1.6)				(2.0)					(43.1)	(14.9)	(23.8)
Other income (expense)	(15.9)				(9.0)					(29.9)	(45.0)	(40.2)
Interest expense (income)	(1.6)				(1.8)					(6.7)	(6.7)	5.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	(15.9)				(9.2)					(66.3)	(53.2)	(59.0)
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	(15.9)				(9.2)					$ (66.3)	$ (53.2)	$ (59.0)
Comprehensive income attributable to Koppers	$ (23.5)				$ (17.9)

Subsidiary Guarantor Information for Shelf Registration (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Condensed Consolidating Balance Sheet
Cash and cash equivalents	$ 42.6	$ 54.1	$ 40.5	$ 35.3	$ 58.4	$ 63.1
S-T investments & restricted cash				0.0
Accounts receivable, net	191.2	160.9		128.9
Inventories, net	178.2	159.0		165.4
Deferred tax assets	9.6	9.3		5.9
Other current assets	20.2	21.8		23.0
Total current assets	454.7	427.4		370.4
Equity investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1	61.6
Deferred tax assets	41.5	44.3		26.1
Other noncurrent assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Accounts payable	96.6	102.1		87.9
Accrued liabilities	60.9	63.1		55.4
Short-term debt and current portion of long-term debt	0.0	0.0		1.0
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Other long-term liabilities	46.7	46.9		38.4
Total liabilities	628.9	623.5		569.3
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	754.1	730.7		669.2
Parent [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Koppers Inc. [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Consolidating Adjustments [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Shelf Registration [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	42.6	54.1	40.5	35.3	58.4	63.1
S-T investments & restricted cash				0.0
Accounts receivable, net	192.4	171.5		140.8
Inventories, net	178.2	159.0		165.4
Deferred tax assets	9.6	9.3		5.9
Other current assets	31.9	33.5		23.0
Total current assets	454.7	427.4		370.4
Equity investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1
Deferred tax assets	41.5	44.3		26.1
Other noncurrent assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Accounts payable	96.6	102.1		87.9
Accrued liabilities	66.5	68.3		60.5
Short-term debt and current portion of long-term debt				1.0
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Other long-term liabilities	151.5	151.0		124.5
Total liabilities	628.9	623.5		569.3
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	754.1	730.7		669.2
Shelf Registration [Member] \| Parent [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.2	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	5.8	5.5		16.6
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	5.8	5.5		16.6
Equity investments	111.7	93.9		76.7
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	117.5	99.4		93.3
Accounts payable	0.1	0.1		0.0
Accrued liabilities	4.9	4.5		4.6
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	5.0	4.6		4.6
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	5.0	4.6		4.6
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	117.5	99.4		93.3
Shelf Registration [Member] \| Koppers Inc. [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	8.4	12.9	37.5
S-T investments & restricted cash				0.0
Accounts receivable, net	113.1	112.6		80.3
Inventories, net	99.0	74.8		78.3
Deferred tax assets	10.9	10.7		7.4
Other current assets	7.2	6.8		6.9
Total current assets	230.2	204.9		181.3
Equity investments	77.1	77.1		77.1
Property, plant and equipment, net	100.3	102.0		94.7
Goodwill	39.8	39.8		39.5
Deferred tax assets	41.2	43.7		65.4
Other noncurrent assets	17.7	18.4		21.6
Total assets	506.3	485.9		479.6
Accounts payable	353.4	344.5		492.5
Accrued liabilities	30.2	27.2		(6.3)
Short-term debt and current portion of long-term debt				0.1
Total current liabilities	383.6	371.7		486.3
Long-term debt	413.0	400.8		295.4
Other long-term liabilities	116.6	116.5		99.6
Total liabilities	913.2	889.0		881.3
Total Koppers shareholders' equity	(406.9)	(403.1)		(401.7)
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	506.3	485.9		479.6
Shelf Registration [Member] \| Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	300.8	283.5		457.4
Inventories, net	0.0	0.0		1.2
Deferred tax assets	(1.5)	(1.5)		(1.5)
Other current assets	0.3	0.3		0.3
Total current assets	299.6	282.3		457.4
Equity investments	26.5	26.3		26.2
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	(10.5)	(10.5)		(43.8)
Other noncurrent assets	126.8	131.2		0.0
Total assets	442.4	429.3		439.8
Accounts payable	14.9	9.5		11.8
Accrued liabilities	(0.9)	(0.9)		34.8
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	14.0	8.6		46.6
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	2.6	2.5		2.9
Total liabilities	16.6	11.1		49.5
Total Koppers shareholders' equity	425.8	418.2		390.3
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	442.4	429.3		439.8
Shelf Registration [Member] \| Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	11.3	28.4	28.8	14.7	36.9	18.7
S-T investments & restricted cash				0.0
Accounts receivable, net	86.1	70.7		81.3
Inventories, net	40.8	49.0		71.3
Deferred tax assets	0.0	0.0		0.0
Other current assets	7.4	8.7		8.8
Total current assets	145.6	156.8		176.1
Equity investments	19.8	19.3		19.4
Property, plant and equipment, net	26.6	26.5		46.9
Goodwill	26.0	25.2		25.4
Deferred tax assets	12.4	12.1		5.3
Other noncurrent assets	20.2	15.7		0.9
Total assets	250.6	255.6		274.0
Accounts payable	19.6	28.6		95.9
Accrued liabilities	24.6	31.7		20.4
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	44.2	60.3		116.3
Long-term debt	64.5	62.7		0.0
Other long-term liabilities	20.3	19.9		13.3
Total liabilities	129.0	142.9		129.6
Total Koppers shareholders' equity	121.6	112.7		144.4
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	250.6	255.6		274.0
Shelf Registration [Member] \| Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	31.3	25.7	11.7	12.2	8.4	6.9
S-T investments & restricted cash				0.0
Accounts receivable, net	75.2	54.1		67.2
Inventories, net	38.5	35.2		14.6
Deferred tax assets	0.2	0.1		0.0
Other current assets	17.0	17.7		7.0
Total current assets	162.2	132.8		101.0
Equity investments	14.1	13.5		13.7
Property, plant and equipment, net	26.8	27.1		26.6
Goodwill	7.2	7.1		7.2
Deferred tax assets	(1.6)	(1.0)		(0.8)
Other noncurrent assets	40.3	40.9		5.1
Total assets	249.0	220.4		152.8
Accounts payable	96.8	74.3		49.7
Accrued liabilities	7.7	5.8		7.0
Short-term debt and current portion of long-term debt				0.9
Total current liabilities	104.5	80.1		57.6
Long-term debt	16.4	18.5		0.0
Other long-term liabilities	12.1	12.1		8.7
Total liabilities	133.0	110.7		66.3
Total Koppers shareholders' equity	103.3	97.3		75.3
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	249.0	220.4		152.8
Shelf Registration [Member] \| Consolidating Adjustments [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	$ 0.0	0.0	$ 0.0	$ 0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	(388.6)	(354.9)		(562.0)
Inventories, net	(0.1)	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	(388.7)	(354.9)		(562.0)
Equity investments	(243.8)	(225.2)		(208.4)
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	(179.2)	(179.8)		0.1
Total assets	(811.7)	(759.9)		(770.3)
Accounts payable	(388.2)	(354.9)		(562.0)
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	(388.2)	(354.9)		(562.0)
Long-term debt	(179.6)	(179.9)		0.0
Other long-term liabilities	(0.1)	0.0		0.0
Total liabilities	(567.9)	(534.8)		(562.0)
Total Koppers shareholders' equity	(243.8)	(225.1)		(208.3)
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	$ (811.7)	$ (759.9)		$ (770.3)

Subsidiary Guarantor Information for Shelf Registration (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 22, 2012	Feb. 18, 2012
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	$ (15.8)	$ (9.5)	$ 76.9	$ 105.3	$ 112.3
Capital expenditures and acquisitions	(3.4)	(4.4)	(33.2)	(29.9)	(18.0)
Loan to related party			(11.7)	0.0	0.0
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.8	2.0	(0.6)
Net cash (used in) investing activities	(3.2)	(5.0)	(44.7)	(63.4)	(20.8)
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs	0.0	(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	(4.5)	(4.5)	(18.2)	(23.1)	(18.0)
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	6.5	18.6	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0	1.1	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)	5.2	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1	35.3	35.3	58.4	63.1
Cash and cash equivalents at end of year	42.6	40.5	54.1	35.3	58.4
Subsidiary Guarantor Information for Shelf Registration (Textual) [Abstract]
Aggregate offering price of common stock, debt securities, preferred stock, depository shares and warrants	325.0		325.0			$ 0.0	$ 0.0
Parent [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Koppers Inc. [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Consolidating Adjustments [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Shelf Registration [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	(15.8)	(9.5)	76.9	105.3	112.3
Capital expenditures and acquisitions	(3.4)	(5.0)	(33.8)	(65.4)	(20.2)
Loan to related party			(11.7)
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.8	2.0	(0.6)
Net cash (used in) investing activities	(3.2)	(5.0)	(44.7)	(63.4)	(20.8)
Borrowings (repayments) of long-term debt	12.1	23.6	5.4	(40.2)	(70.8)
Deferred financing costs		(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	(4.5)	(4.5)	(18.2)	(23.1)	18.0
Stock issued (repurchased)	(1.1)	0.0		(0.6)
Net cash provided by (used in) financing activities	6.5	18.6	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0	1.1	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)	5.2	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1	35.3	35.3	58.4	63.1
Cash and cash equivalents at end of year	42.6	40.5	54.1	35.3	58.4
Shelf Registration [Member] \| Parent [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	5.6	4.6	18.1	18.7	231.8
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	(0.1)	0.0	0.0	(213.6)
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	(4.5)	(4.5)	(18.1)	(18.1)	18.0
Stock issued (repurchased)	(1.1)	0.0		(0.8)
Net cash provided by (used in) financing activities	(5.6)	(4.6)	(18.1)	(18.9)	(231.6)
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	(0.2)	0.2
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.2	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.2
Shelf Registration [Member] \| Koppers Inc. [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	(9.4)	(28.7)	9.5	75.2	90.7
Capital expenditures and acquisitions	(2.7)	(3.6)	(24.5)	35.0	15.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.7	0.2	(0.7)
Net cash (used in) investing activities	(2.7)	(3.6)	(23.8)	(34.8)	(15.7)
Borrowings (repayments) of long-term debt	12.1	24.5	6.3	(40.2)	142.8
Deferred financing costs		(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	0.0	0.0	0.0	(4.5)	(232.7)
Stock issued (repurchased)	0.0	0.0		0.2
Net cash provided by (used in) financing activities	12.1	24.0	5.8	(44.9)	98.0
Effect of exchange rates on cash	0.0	(0.1)	0.1	0.0	(1.6)
Net increase (decrease) in cash and cash equivalents	0.0	(8.4)	(8.4)	(4.5)	(24.6)
Cash and cash equivalents at beginning of year	0.0	8.4	8.4	12.9	37.5
Cash and cash equivalents at end of year	0.0	0.0	0.0	8.4	12.9
Shelf Registration [Member] \| Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Shelf Registration [Member] \| Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	(19.4)	12.1	20.5	(15.3)	19.5
Capital expenditures and acquisitions	(0.6)	(1.1)	(6.2)	(7.0)	(3.7)
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.1	1.7	0.1
Net cash (used in) investing activities	(0.4)	(1.1)	(6.1)	(5.3)	(3.6)
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	2.7	3.1	(0.7)	(1.6)	2.3
Net increase (decrease) in cash and cash equivalents	(17.1)	14.1	13.7	(22.2)	18.2
Cash and cash equivalents at beginning of year	28.4	14.7	14.7	36.9	18.7
Cash and cash equivalents at end of year	11.3	28.8	28.4	14.7	36.9
Shelf Registration [Member] \| Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	7.4	2.5	28.8	31.2	3.0
Capital expenditures and acquisitions	(0.1)	(0.3)	(3.1)	(23.4)	(1.5)
Loan to related party			(11.7)
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.1	0.0
Net cash (used in) investing activities	(0.1)	(0.3)	(14.8)	(23.3)	(1.5)
Borrowings (repayments) of long-term debt	0.0	(0.8)	(0.9)	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	(0.1)	5.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	(0.8)	(1.0)	5.0	0.0
Effect of exchange rates on cash	(1.7)	(1.9)	0.5	0.9	0.0
Net increase (decrease) in cash and cash equivalents	5.6	(0.5)	13.5	3.8	1.5
Cash and cash equivalents at beginning of year	25.7	12.2	12.2	8.4	6.9
Cash and cash equivalents at end of year	31.3	11.7	25.7	12.2	8.4
Shelf Registration [Member] \| Consolidating Adjustments [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	(4.5)	(232.7)
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	4.5	232.7
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	4.5	232.7
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Related Party Transactions (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Nov. 30, 2011	Dec. 31, 2010	Dec. 01, 2009
Related Party Transaction [Line Items]
Long-term debt	$ 314,300,000	$ 302,100,000		$ 295,400,000
Loan repayable date	2012-11
Tangshan Koppers Kailuan Carbon Chemical Company Limited [Member]
Related Party Transaction [Line Items]
Loan to related party			$ 11,700,000
Ownership percentage			30.00%
Senior Notes [Member]
Related Party Transaction [Line Items]
Debt instrument, face amount	$ 300,000,000	300,000,000			$ 300,000,000
Debt instrument, offering value	$ 294,900,000	$ 294,900,000
Debt instrument, offering price percentage	98.311%	98.311%
Long-term debt		$ 295,000,000
Senior Notes [Member] \| Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Debt instrument, face amount		500,000
Debt instrument, offering value		$ 491,555
Debt instrument, offering price percentage		98.311%

Subsequent Events (Condensed Consolidating Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Consolidating Statement of Income
Net sales	$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	18.0				17.7					75.2	63.3	58.1
Operating profit	29.2	(19.2)	40.3	37.1	21.3	15.9	33.5	32.8	16.8	79.0	99.0	94.9
Other income (expense)	0.7				0.0					0.7	1.9	(0.7)
Interest expense (income)	6.9				6.9					27.2	27.1	36.3
Income taxes	7.2				5.2					14.9	29.1	13.8
Income from continuing operations	15.8	(14.0)	22.7	19.9	9.2	5.2	15.8	16.3	7.4	37.6	44.7	21.7
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.3				0.1					0.7	0.4	2.6
Net income attributable to Koppers	15.6	$ (14.2)	$ 22.4	$ 19.8	8.9	$ 5.1	$ 15.6	$ 16.1	$ 7.3	36.9	44.1	18.8
Parent [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Koppers Inc. [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	0.0				0.0					0.0	0.0	0.0
Consolidating Adjustments [Member]
Condensed Consolidating Statement of Income
Net sales	0.0				0.0					0.0	0.0	0.0
Cost of sales including depreciation and amortization	0.0				0.0					0.0	0.0	0.0
Selling, general and administrative	0.0				0.0					0.0	0.0	0.0
Operating profit	0.0				0.0					0.0	0.0	0.0
Other income (expense)	0.0				0.0					0.0	0.0	0.0
Interest expense (income)	0.0				0.0					0.0	0.0	0.0
Income taxes	0.0				0.0					0.0	0.0	0.0
Income from continuing operations	0.0				0.0					0.0	0.0	0.0
Discontinued operations	0.0				0.0					0.0	0.0	0.0
Noncontrolling interests	0.0				0.0					0.0	0.0	0.0
Net income attributable to Koppers	$ 0.0				$ 0.0					$ 0.0	$ 0.0	$ 0.0

Subsequent Events (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Condensed Consolidating Balance Sheet
Cash and cash equivalents	$ 42.6	$ 54.1	$ 40.5	$ 35.3	$ 58.4	$ 63.1
S-T investments & restricted cash				0.0
Accounts receivable, net	191.2	160.9		128.9
Inventories, net	178.2	159.0		165.4
Deferred tax assets	9.6	9.3		5.9
Other current assets	20.2	21.8		23.0
Total current assets	454.7	427.4		370.4
Equity investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1	61.6
Deferred tax assets	41.5	44.3		26.1
Other noncurrent assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Accounts payable	96.6	102.1		87.9
Accrued liabilities	60.9	63.1		55.4
Short-term debt and current portion of long-term debt	0.0	0.0		1.0
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Other long-term liabilities	46.7	46.9		38.4
Total liabilities	628.9	623.5		569.3
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	754.1	730.7		669.2
Equity investments	5.4	4.9		4.7
Property, plant and equipment, net	153.7	155.6		168.2
Goodwill	73.0	72.1		72.1	61.6
Deferred tax assets	41.5	44.3		26.1
Other noncurrent assets	25.8	26.4		27.7
Total assets	754.1	730.7		669.2
Accounts payable	96.6	102.1		87.9
Accrued liabilities	60.9	63.1		55.4
Total current liabilities	163.1	170.4		149.4
Long-term debt	314.3	302.1		295.4
Other long-term liabilities	46.7	46.9		38.4
Total liabilities	628.9	623.5		569.3
Total Koppers shareholders' equity	112.5	94.8		88.7
Noncontrolling interests	12.7	12.4		11.2
Total liabilities and equity	754.1	730.7		669.2
Parent [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Koppers Inc. [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Consolidating Adjustments [Member]
Condensed Consolidating Balance Sheet
Cash and cash equivalents	0.0	0.0	$ 0.0	0.0	$ 0.0	$ 0.0
S-T investments & restricted cash				0.0
Accounts receivable, net	0.0	0.0		0.0
Inventories, net	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other current assets	0.0	0.0		0.0
Total current assets	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Short-term debt and current portion of long-term debt				0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	0.0	0.0		0.0
Equity investments	0.0	0.0		0.0
Property, plant and equipment, net	0.0	0.0		0.0
Goodwill	0.0	0.0		0.0
Deferred tax assets	0.0	0.0		0.0
Other noncurrent assets	0.0	0.0		0.0
Total assets	0.0	0.0		0.0
Accounts payable	0.0	0.0		0.0
Accrued liabilities	0.0	0.0		0.0
Total current liabilities	0.0	0.0		0.0
Long-term debt	0.0	0.0		0.0
Other long-term liabilities	0.0	0.0		0.0
Total liabilities	0.0	0.0		0.0
Total Koppers shareholders' equity	0.0	0.0		0.0
Noncontrolling interests	0.0	0.0		0.0
Total liabilities and equity	$ 0.0	$ 0.0		$ 0.0

Subsequent Events (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	$ (15.8)	$ (9.5)	$ 76.9	$ 105.3	$ 112.3
Capital expenditures and acquisitions	(3.4)	(4.4)	(33.2)	(29.9)	(18.0)
Loan to related party			(11.7)	0.0	0.0
Net cash proceeds (payments) from divestitures and asset sales	0.2	0.0	0.8	2.0	(0.6)
Net cash (used in) investing activities	(3.2)	(5.0)	(44.7)	(63.4)	(20.8)
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs	0.0	(0.5)	(0.5)	(0.4)	(8.1)
Dividends paid	(4.5)	(4.5)	(18.2)	(23.1)	(18.0)
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	6.5	18.6	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0	1.1	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)	5.2	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1	35.3	35.3	58.4	63.1
Cash and cash equivalents at end of year	42.6	40.5	54.1	35.3	58.4
Dividends paid	(4.5)	(4.5)	(18.2)	(23.1)	(18.0)
Net cash provided by (used in) financing activities	6.5	18.6	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	1.0	1.1	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	(11.5)	5.2	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	54.1	35.3	35.3	58.4	63.1
Cash and cash equivalents at end of year	42.6	40.5	54.1	35.3	58.4
Parent [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Koppers Inc. [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Domestic Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Foreign Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Consolidating Adjustments [Member]
Condensed Consolidating Statement of Cash Flows
Cash provided by (used in) operating activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures and acquisitions	0.0	0.0	0.0	0.0	0.0
Loan to related party			0.0
Net cash proceeds (payments) from divestitures and asset sales	0.0	0.0	0.0	0.0	0.0
Net cash (used in) investing activities	0.0	0.0	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0	0.0	0.0
Deferred financing costs		0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Stock issued (repurchased)	0.0	0.0		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0	0.0	0.0
Cash and cash equivalents at end of year	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Subsequent Events (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Jun. 22, 2012	Mar. 31, 2012	Feb. 18, 2012
Costs related to closure	$ 41.0	$ 41.0
Aggregate offering price of common stock, debt securities, preferred stock, depository shares and warrants	$ 325.0	325.0	$ 0.0	$ 325.0	$ 0.0
Wood Treating Facility [Member]
Costs related to closure		$ 2.5

- Definition

+ References + Details

Summary of Significant Accounting Policies (Summary Of Self-Insured Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Summary of Self-Insured Liabilities
Self-insured liabilities at beginning of year	$ 7.9	$ 12.1
Expense	2.1	2.5
Reversal of self-insured liabilities	(1.0)	(4.5)
Cash expenditures	(1.6)	(2.2)
Self-insured liabilities at end of year	$ 7.4	$ 7.9

Summary of Significant Accounting Policies (Summary Of Asset Retirement Obligation Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Summary of Asset Retirement Obligation Liabilities
Asset retirement obligation at beginning of year	$ 21.3	$ 17.0	$ 17.0	$ 16.6
Accretion expense	0.2	1.1	1.1	1.3
Revision in estimated cash flows	0.1	6.3	6.3	1.5
Cash expenditures			(3.1)	(2.4)
Acquisitions			0.0	0.3
Currency translation	0.2	0.0	0.0	(0.3)
Asset retirement obligation at end of year	$ 21.4	$ 21.3	$ 21.3	$ 17.0

Summary of Significant Accounting Policies (Summary Of Changes To Deferred Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Summary of Changes to Deferred Revenue
Deferred revenue at beginning of year	$ 4.8	$ 5.7	$ 5.7	$ 6.7
Revenue earned	(0.2)	(0.9)	(0.9)	(1.0)
Deferred revenue at end of year	$ 4.6	$ 4.8	$ 4.8	$ 5.7

Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended									12 Months Ended
	Oct. 31, 2009 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2010 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Dec. 31, 2011 USD ($) yr	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2004 USD ($)
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue, Net		$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Cumulative translation adjustments for intercompany loans			$ (0.5)				$ 7.2				(0.5)	7.2	12.7
Foreign currency transaction losses											0.5	2.3	1.9
Research and development costs											$ 1.9	$ 2.1	2.0
Percentage of LIFO inventory			59.00%				59.00%				59.00%	59.00%
Asset retirement costs related to closure											$ 6.2
Prepaid expenses			$ 9.9				$ 7.6				$ 9.9	$ 7.6
Convertible Senior Secured Notes, interest rate swap agreement portion														$ 50.0
Gain on termination, decrease in interest expense													2.3
Period for payment of approval basis sale											30 years
Maximum maturity period for highly liquid investment											90 days
Parent [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue, Net		$ 0.0				$ 0.0					$ 0.0	0.0	0.0
Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Equity method investment, ownership percentage			50.00%								50.00%
Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Equity method investment, ownership percentage			20.00%								20.00%
Buildings [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives, minimum \| yr											10
Estimated useful lives, maximum \| yr											20
Machinery And Equipment [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives, minimum \| yr											3
Estimated useful lives, maximum \| yr											10
Interest Rate Swap [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Swap was terminated which resulted in a gain	$ 1.6
Untreated Crosstie Sales [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue, Net											$ 116.5	$ 106.4	$ 119.1

Business Acquisitions (Schedule Of Identifiable Assets Acquired And Liabilities Assumed Upon Acquisition) (Details) - Koppers Netherlands [Member] $ in Millions	Feb. 28, 2010 USD ($)
Schedule of Identifiable Assets Acquired and Liabilities Assumed Upon Acquisition
Cash and cash equivalents	$ 2.1
Accounts receivable	6.5
Inventory	7.1
Other current assets	2.8
Property, plant and equipment	8.7
Intangibles	4.4
Goodwill	6.1
Total assets acquired	37.7
Accounts payable	9.8
Accrued liabilities	3.0
Long-term debt	0.6
Deferred tax liability	2.2
Long-term liabilities	0.5
Net assets acquired	$ 21.6

Business Acquisitions (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended									12 Months Ended
Business Acquisitions (Narrative) (Details) $ in Millions	Feb. 28, 2010 USD ($) Mg	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2010 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 22, 2010 USD ($)	Oct. 31, 2010 USD ($)
Business Acquisitions (Textual) [Abstract]
Revenue, Net		$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Operating Income (Loss)		29.2	$ (19.2)	$ 40.3	$ 37.1	21.3	$ 15.9	$ 33.5	$ 32.8	$ 16.8	79.0	99.0	94.9
Depreciation and amortization		$ 6.8				$ 6.4					$ 48.8	28.1	24.8
Business Acquisitions (Additional Textual) [Abstract]
Coal tar plant, capacity (in metric tons) \| Mg	140,000
Pro forma revenue												1,280.4	1,191.9
Pro forma operating profit												100.1	91.0
Koppers Netherlands [Member]
Business Acquisitions (Textual) [Abstract]
Company acquired percent	100.00%
Revenue, Net												48.4
Operating Income (Loss)												0.8
Depreciation and amortization												1.2
Business acquisition cash	$ 21.6
Intangible assets included in net assets acquired	4.4
Inventory acquired	7.1
Plant and equipment acquired	8.7
Portec [Member]
Business Acquisitions (Textual) [Abstract]
Business acquisition cash														$ 10.7
Inventory acquired														7.1
Plant and equipment acquired														2.7
Intangible assets														0.6
Tax deductible goodwill														$ 0.3
Other Acquisitions [Member]
Business Acquisitions (Textual) [Abstract]
Business acquisition cash															$ 6.1
Inventory acquired															1.6
Intangible assets															1.7
Tax deductible goodwill															$ 2.8
Selling, General And Administrative Expenses [Member] \| Koppers Netherlands [Member]
Business Acquisitions (Textual) [Abstract]
Acquisition expenses												$ 1.8	$ 1.7
Carbon Materials & Chemicals Segment [Member] \| Koppers Netherlands [Member]
Business Acquisitions (Textual) [Abstract]
Goodwill income tax not deductible	6.1
Coal Supply Agreements [Member] \| Koppers Netherlands [Member]
Business Acquisitions (Textual) [Abstract]
Intangible assets included in net assets acquired	2.9
Customer Relationships [Member] \| Koppers Netherlands [Member]
Business Acquisitions (Textual) [Abstract]
Intangible assets included in net assets acquired	$ 0.7
Remaining Amortization Period	Ten
Lease Agreements [Member] \| Koppers Netherlands [Member]
Business Acquisitions (Textual) [Abstract]
Intangible assets included in net assets acquired	$ 0.8
Remaining Amortization Period	Three

Restructuring (Summary Of Restructuring Activities And Related Reserves) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2010
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	$ 15.9
Charges	0.3	$ 41.0
Costs charged against assets	(0.3)	(23.5)
Cash paid	(1.1)	(1.6)
Reserve at end	15.1	0.0
Severance And Employee Benefits [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	1.8
Charges	0.0	3.4
Costs charged against assets	0.0	0.0
Cash paid	(0.9)	(1.6)
Reserve at end	0.8	0.0
Environmental Remediation [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	6.7
Charges	0.0	6.7
Costs charged against assets	0.0	0.0
Cash paid	0.0	0.0
Reserve at end	6.9	0.0
Asset Impairment [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	0.0
Charges		20.2
Costs charged against assets		(20.2)
Cash paid		0.0
Reserve at end		0.0
Inventory Writedowns [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	0.0
Charges	0.3	3.3
Costs charged against assets	(0.3)	(3.3)
Cash paid	0.0	0.0
Reserve at end	0.0	0.0
Site Demolition [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	6.2
Charges	0.0	6.2
Costs charged against assets	0.0	0.0
Cash paid	0.0	0.0
Reserve at end	6.4	0.0
Restructuring Activities Other [Member]
Summary of Restructuring Activities and Related Reserves
Reserve at beginning	1.2
Charges	0.0	1.2
Costs charged against assets	0.0	0.0
Cash paid	(0.2)	0.0
Reserve at end	$ 1.0	$ 0.0

Restructuring (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Restructuring (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2011
Restructuring (Textual) [Abstract]
Costs related to closure		$ 41.0	$ 41.0
Estimated total future closure costs	$ 1.6		$ 1.7
Future completion period, closure	2014		2014
Cost of Sales [Member]
Restructuring (Textual) [Abstract]
Costs related to closure		20.8	$ 20.8
Depreciation and Amortization [Member]
Restructuring (Textual) [Abstract]
Costs related to closure		$ 20.2	$ 20.2

- Definition

+ References + Details

Equity Investments (Equity Earnings (Losses) And Dividends Received) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity Earnings (Losses) and Dividends Received
Equity income (loss)	$ 0.2	$ 0.0	$ (1.5)
Dividends received	$ 0.0	$ 0.0	$ 0.5

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 19
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 6
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.12)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 7

+ Details

Equity Investments (Narrative) (Details)	Dec. 31, 2011
KSA Limited Partnership [Member]
Equity Investments (Textual) [Abstract]
Ownership percentage	50.00%
Tangshan Koppers Kailuan Carbon Chemical Company Limited [Member]
Equity Investments (Textual) [Abstract]
Ownership percentage	30.00%

Goodwill and Other Identifiable Intangible Assets (Changes In The Carrying Amount Of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Changes in the Carrying Amount of Goodwill
Balance beginning	$ 72.1	$ 61.6
Acquisitions	0.4	8.6
Currency translation	(0.4)	1.9
Balance ending	72.1	72.1
Carbon Materials & Chemicals [Member]
Changes in the Carrying Amount of Goodwill
Balance beginning	69.6	59.4
Acquisitions	0.1	8.6
Currency translation	(0.3)	1.6
Balance ending	69.4	69.6
Railroad & Utility Products [Member]
Changes in the Carrying Amount of Goodwill
Balance beginning	2.5	2.2
Acquisitions	0.3	0.0
Currency translation	(0.1)	0.3
Balance ending	$ 2.7	$ 2.5

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Other Identifiable Intangible Assets (Schedule Of Identifiable Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Schedule of Identifiable Intangible Assets
Gross Carrying Amount	$ 17.0	$ 18.0
Accumulated Amortization	9.0	7.5
Net	8.0	10.5
Customer Contracts [Member]
Schedule of Identifiable Intangible Assets
Gross Carrying Amount	12.3	13.2
Accumulated Amortization	6.8	5.9
Net	5.5	7.3
Supply Contracts [Member]
Schedule of Identifiable Intangible Assets
Gross Carrying Amount	2.7	2.8
Accumulated Amortization	0.5	0.2
Net	2.2	2.6
Favorable Lease Agreements [Member]
Schedule of Identifiable Intangible Assets
Gross Carrying Amount	0.8	0.8
Accumulated Amortization	0.5	0.2
Net	0.3	0.6
Non-Compete Agreements [Member]
Schedule of Identifiable Intangible Assets
Gross Carrying Amount	1.2	1.2
Accumulated Amortization	1.2	1.2
Net	$ 0.0	$ 0.0

Goodwill and Other Identifiable Intangible Assets (Schedule Of Future Amortization Expense) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Schedule of Future Amortization Expense
2012	$ 1.5
2013	1.3
2014	1.2
2015	1.2
2016	$ 0.8

Goodwill and Other Identifiable Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) yr	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Goodwill and Other Identifiable Intangible Assets (Textual) [Abstract]
Increase to intangible assets due to acquisitions \| $		$ 7.4
Amortization expense \| $	$ 1.5	1.2	$ 0.8
Purchase Price Adjustments [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying value of identifiable intangible assets increase (decrease) \| $	0.8
Foreign Currency Translation [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying value of identifiable intangible assets increase (decrease) \| $	$ 0.2	$ 0.2
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| yr	10
Supply Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| yr	10
Favorable Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| yr	3
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| yr	3

Leases (Future Minimum Commitments For Operating Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Future Minimum Commitments for Operating Leases
2012	$ 38.1
2013	27.9
2014	13.5
2015	7.9
2016	6.3
Thereafter	31.1
Total	124.8
Leases (Textual) [Abstract]
Operating lease expense	$ 43.8	$ 42.5	$ 41.5

Common Stock and Senior Convertible Preferred Stock (Schedule Of Changes In Senior Convertible Preferred Stock, Common Stock And Treasury Stock) (Details) - shares	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Changes in Senior Convertible Preferred Stock, Common Stock and Treasury Stock
Preferred Stock Balance at beginning and end of year	0	0	0
Common Stock, Balance at beginning of year	21,278,000	21,124,000	21,097,000
Common Stock, Issued for employee stock plans	31,000	154,000	27,000
Common Stock, Balance at end of year	21,309,000	21,278,000	21,124,000
Treasury Stock, Balance at beginning of year	(700,203)	(669,000)	(669,000)
Treasury Stock, Shares repurchased	(6,000)	(31,000)	0
Treasury Stock, Balance at end of year	(706,161)	(700,203)	(669,000)

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References + Details

Selected Quarterly Financial Data (Unaudited) (Schedule Of Selected Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended									12 Months Ended
	Feb. 15, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Selected Quarterly Financial Data
Net sales		$ 380.9	$ 385.2	$ 401.0	$ 393.6	$ 341.5	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Operating profit (loss)		29.2	(19.2)	40.3	37.1	21.3	15.9	33.5	32.8	16.8	79.0	99.0	94.9
Income (loss) from continuing operations		15.8	(14.0)	22.7	19.9	9.2	5.2	15.8	16.3	7.4	37.6	44.7	21.7
Net income (loss)		15.9	(14.0)	22.7	19.9	9.0	5.2	15.8	16.1	7.4	37.6	44.5	21.4
Net income (loss) attributable to Koppers		$ 15.6	$ (14.2)	$ 22.4	$ 19.8	$ 8.9	$ 5.1	$ 15.6	$ 16.1	$ 7.3	$ 36.9	$ 44.1	$ 18.8
Continuing operations		$ 0.74				$ 0.44	$ 0.24	$ 0.76	$ 0.79	$ 0.36	$ 1.79	$ 2.15	$ 0.93
Discontinued operations		0.01				(0.01)	0.00	0.00	(0.01)	0.00	0.00	(0.01)	(0.01)
Earnings (loss) per basic common share		0.75	$ (0.69)	$ 1.08	$ 0.96	0.43	0.24	0.76	0.78	0.36	1.79	2.14	0.92
Continuing operations		0.74				0.44	0.24	0.75	0.79	0.36	1.77	2.14	0.92
Discontinued operations		0.01				(0.01)	0.00	0.00	(0.01)	0.00	0.00	(0.01)	(0.01)
Earnings (loss) per diluted common share		0.75	(0.69)	1.08	0.96	0.43	0.24	0.75	0.78	0.36	1.77	2.13	0.91
Dividends declared per common share	$ 0.24	$ 0.24	$ 0.22	0.22	0.22	0.22	0.22	0.22	0.22	0.22	$ 0.88	0.88	$ 0.88
Costs related to closure			$ 41.0								$ 41.0
Cost of Sales [Member]
Schedule of Selected Quarterly Financial Data
Costs related to closure			20.8								20.8
Depreciation and Amortization [Member]
Schedule of Selected Quarterly Financial Data
Costs related to closure			$ 20.2								$ 20.2
Minimum [Member]
Schedule of Selected Quarterly Financial Data
Price range of common stock			$ 24.75	23.59	34.63	34.76	25.69	19.77	22.42	25.58	$ 23.59	19.77
Maximum [Member]
Schedule of Selected Quarterly Financial Data
Price range of common stock			$ 36.53	$ 39.23	$ 46.14	$ 42.88	$ 36.47	$ 27.19	$ 33.56	$ 33.32	$ 46.14	$ 36.47

Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Year	$ 0.1	$ 0.5	$ 0.5
Increase (Decrease) to Expense	0.3	(0.3)	0.0
Net (Write-Offs) Recoveries	(0.1)	0.0	(0.1)
Currency Translation	0.0	(0.1)	0.1
Balance at End of Year	0.3	0.1	0.5
Inventory Obsolescence Reserves [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Year	2.1	3.9	1.5
Increase (Decrease) to Expense	4.2	(1.7)	2.3
Net (Write-Offs) Recoveries	(4.9)	0.0	(0.2)
Currency Translation	0.0	(0.1)	0.1
Balance at End of Year	1.4	2.1	3.9
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Year	11.4	11.2	8.2
Increase (Decrease) to Expense	(1.2)	0.2	3.0
Net (Write-Offs) Recoveries	0.0	0.0	0.0
Currency Translation	0.0	0.0	0.0
Balance at End of Year	$ 10.2	$ 11.4	$ 11.2