View Filing Data

Cost of sales (excluding items below)

$ 1,538.9

$ 1,245.5

$ 1,124.4

1,335.9

1,055.1

946.6

Selling, general and administrative expenses

48.8

28.1

24.8

75.2

63.3

58.1

Loss on extinguishment of debt

79.0

^[1]

99.0

94.9

Other income (loss)

0.7

1.9

(0.7)

Interest expense

27.2

27.1

36.3

0.0

22.4

Income before income taxes

52.5

73.8

35.5

14.9

29.1

13.8

Loss on sale of Koppers Arch, net of tax benefit of $0.1

37.6

^[1]

44.7

21.7

0.0

(0.2)

0.0

Loss on sale of Monessen, net of tax benefit of $0.2

0.0

(0.3)

Net income

37.6

^[1]

44.5

21.4

Net income attributable to noncontrolling interests

0.7

0.4

2.6

$ 36.9

^[1]

$ 44.1

$ 18.8

Basic -

$ 1.79

$ 2.15

$ 0.93

Earnings per basic common share

0.00

(0.01)

1.79

2.14

0.92

Diluted -

1.77

2.14

0.92

Earnings per diluted common share

0.00

(0.01)

$ 1.77

$ 2.13

$ 0.91

Weighted average common shares outstanding (in thousands):

Basic

20,599

20,543

20,446

Diluted

20,833

20,676

20,561

Dividends declared per common share

$ 0.88

[1]

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, 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.

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

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.

Consolidated Statement Of Comprehensive Income [Abstract]

Consolidated Statement Of Comprehensive Income - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Net income

$ 37.6

^[1]

$ 44.5

$ 21.4

Changes in other comprehensive income (loss):

Currency translation adjustment

(2.5)

11.5

24.0

Unrecognized pension transition asset, net of tax of $(0.1), $(0.1) and $(0.1)

(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

(14.9)

(0.7)

1.9

Total comprehensive income

20.1

55.3

47.0

Comprehensive income attributable to noncontrolling interests

1.2

0.7

3.5

Comprehensive income attributable to Koppers

$ 18.9

$ 54.6

$ 43.5

[1]

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	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 54.1	$ 35.3
Accounts receivable, net of allowance of $0.3 and $0.1	160.9	128.9
Income tax receivable	10.6	11.9
Inventories, net	159.0	165.4
Deferred tax assets	9.3	5.9
Loan to related party	11.7	0.0
Other current assets	21.8	23.0
Total current assets	427.4	370.4
Equity in non-consolidated investments	4.9	4.7
Property, plant and equipment, net	155.6	168.2
Goodwill	72.1	72.1
Deferred tax assets	44.3	26.1
Other assets	26.4	27.7
Total assets	730.7	669.2
Liabilities
Accounts payable	102.1	87.9
Accrued liabilities	63.1	55.4
Dividends payable	5.2	5.1
Short-term debt and current portion of long-term debt	0.0	1.0
Total current liabilities	170.4	149.4
Long-term debt	302.1	295.4
Accrued postretirement benefits	104.1	86.1
Other long-term liabilities	46.9	38.4
Total liabilities	623.5	569.3
Commitments and contingent liabilities (Note 18)
Equity
Senior Convertible Preferred Stock, $0.01 par value per share; 10,000,000 shares authorized; no shares issued	0.0	0.0
Common Stock, $0.01 par value per share; 40,000,000 shares authorized; 21,309,210 and 21,278,480 shares issued	0.2	0.2
Additional paid-in capital	142.9	137.0
Retained earnings (deficit)	6.7	(11.7)
Accumulated other comprehensive loss	(30.2)	(12.3)
Treasury stock, at cost, 706,161 and 700,203 shares	(24.8)	(24.5)
Total Koppers shareholders' equity	94.8	88.7
Noncontrolling interests	12.4	11.2
Total equity	107.2	99.9
Total liabilities and equity	$ 730.7	$ 669.2

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowance	$ 0.3	$ 0.1
Senior convertible preferred stock, par value	$ 0.01	$ 0.01
Senior convertible preferred stock, shares authorized	10,000,000	10,000,000
Senior convertible preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,309,210	21,278,480
Treasury stock, shares	706,161	700,203

Consolidated Statement Of Cash Flows - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Cash provided by (used in) operating activities

Net income

$ 37.6

^[1]

$ 44.5

$ 21.4

Adjustments to reconcile net cash provided by operating activities:

Loss on extinguishment of debt

48.8

28.1

26.6

0.0

22.4

(Gain) loss on sale of assets

(0.2)

(1.0)

0.6

Deferred income taxes

(11.3)

5.0

22.9

Non-cash interest expense

1.6

1.7

16.4

Equity income of affiliated companies, net of dividends received

(0.2)

0.0

2.0

Change in other liabilities

4.0

(2.5)

6.8

Stock-based compensation

5.3

3.3

2.5

Other

(3.0)

0.8

0.6

(Increase) decrease in working capital:

Accounts receivable

(33.2)

(19.1)

16.1

Inventories

5.1

8.2

31.5

Accounts payable

15.3

9.7

(16.8)

Accrued liabilities and other working capital

7.1

26.6

(40.7)

Net cash provided by operating activities

76.9

105.3

112.3

Cash provided by (used in) investing activities

Capital expenditures

(33.2)

(29.9)

(18.0)

Acquisitions, net of cash acquired

(0.6)

(35.5)

(2.2)

Loan to related party

(11.7)

0.0

Net cash proceeds (payments) from divestitures and asset sales

0.8

2.0

(0.6)

Net cash (used in) investing activities

(44.7)

(63.4)

(20.8)

Cash provided by (used in) financing activities

Borrowings of revolving credit

218.0

152.1

190.0

Repayments of revolving credit

(211.6)

(192.1)

(150.0)

Borrowings on long-term debt

0.0

294.9

Repayments of long-term debt

(1.0)

(0.2)

(405.7)

Issuances of Common Stock

0.3

0.1

0.0

Repurchases of Common Stock

(0.3)

(0.9)

0.0

Excess tax benefit from employee stock plans

0.0

0.2

0.0

Payment of deferred financing costs

(0.5)

(0.4)

(8.1)

Dividends paid

(18.2)

(23.1)

(18.0)

Net cash provided by (used in) financing activities

(13.3)

(64.3)

(96.9)

Effect of exchange rates on cash

(0.1)

(0.7)

0.7

Net increase (decrease) in cash and cash equivalents

18.8

(23.1)

(4.7)

Cash and cash equivalents at beginning of year

35.3

58.4

63.1

Cash and cash equivalents at end of year

54.1

35.3

58.4

Supplemental disclosure of cash flows information:

Interest

25.8

25.5

19.8

Noncash investing and financing activities:

25.7

(3.9)

26.1

Capital leases

$ 0.0

$ 0.1

$ 0.0

[1]

Consolidated Statement Of Shareholders' Equity - USD ($)
$ in Millions

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]

Total

Balance at Dec. 31, 2008

$ 0.0

$ 0.2

$ 126.6

$ (37.8)

$ (2.5)

$ 0.9

$ (0.4)

$ (45.4)

$ (23.6)

$ 8.0

Employee stock plans

0.6

Change in currency translation adjustment

18.8

$ 18.8

Common Stock dividends

(18.3)

23.1

0.9

24.0

Change in unrecognized pension transition asset, net of tax

(0.2)

Change in unrecognized pension prior service cost, net of tax

(0.1)

Change in unrecognized pension net loss, net of tax

1.9

Purchases

0.0

Net income attributable to noncontrolling interests

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 at Dec. 31, 2009

54.8

Employee stock plans

9.8

Change in currency translation adjustment

44.1

Common Stock dividends

(18.5)

11.1

0.4

11.5

Change in unrecognized pension transition asset, net of tax

(0.2)

Change in unrecognized pension prior service cost, net of tax

0.2

Change in unrecognized pension net loss, net of tax

(0.7)

Purchases

(0.9)

Net income attributable to noncontrolling interests

0.4

Dividends to noncontrolling interests

(0.6)

Balance at Dec. 31, 2010

0.0

0.2

137.0

(11.7)

31.7

0.5

(0.3)

(44.2)

(12.3)

(24.5)

88.7

11.2

88.7

Total equity at Dec. 31, 2010

99.9

Employee stock plans

5.9

Change in currency translation adjustment

36.9

^[1]

Common Stock dividends

(18.5)

(2.9)

0.5

(2.5)

Change in unrecognized pension transition asset, net of tax

(0.2)

Change in unrecognized pension prior service cost, net of tax

0.1

Change in unrecognized pension net loss, net of tax

(14.9)

Purchases

(0.3)

Net income attributable to noncontrolling interests

0.7

Dividends to noncontrolling interests

0.0

Balance at Dec. 31, 2011

$ 0.0

$ 0.2

$ 142.9

$ 6.7

$ 28.8

$ 0.3

$ (0.2)

$ (59.1)

$ (30.2)

$ (24.8)

$ 94.8

$ 12.4

94.8

Total equity at Dec. 31, 2011

$ 107.2

[1]

Description Of Business	12 Months Ended
Description Of Business	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 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, 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.

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).

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
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-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
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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, 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 $1.7 million, net of proceeds from inventory liquidation. The closure is expected to be completed by 2014. During 2012, this facility will be reclassified as a discontinued operation when all sales activities related to remaining inventory at the location are completed. The facility is part of the Carbon Materials & Chemicals segment.

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

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.

Earnings And Dividends Per Common Share [Abstract]

Earnings And Dividends Per Common Share

12 Months Ended

Dec. 31, 2011

Earnings And Dividends Per Common Share

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		0.0		(0.2	)		(0.3	)

Income from continuing operations attributable to Koppers	$	36.9	$	44.3		$	19.1

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	$	1.79	$	2.15		$	0.93
Diluted earnings per common share		1.77		2.14			0.92

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

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Stock-Based Compensation

6. 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 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.

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 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

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 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 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 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.

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

7. Income Taxes

Income Tax Provision

Components of the Company's income tax provision are as follows:


	Years Ended December 31,
	2011			2010		2009
(Dollars in millions)
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		(11.2	)		5.0		22.9

Total income tax provision	$	14.9		$	29.1	$	13.8

Income before income taxes for 2011, 2010 and 2009 included $8.1 million, $51.2 million and $42.4 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		1.3			0.7			(1.2	)
Foreign earnings taxed at different rates		(13.7	)		2.6			5.2
Domestic production activities deduction		(2.3	)		(0.7	)		0.0
Non-deductible fines and penalties		0.3			0.0			1.1
Deferred tax adjustments		0.2			0.0			(0.9	)
Change in tax contingency reserves		6.9			0.2			0.3
Other		0.7			1.7			(0.7	)

		28.4	%		39.5	%		38.8	%

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.

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.

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

Segment Information

12 Months Ended

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.

Results of Segment Operations


	Year Ended December 31,
	2011			2010			2009
(Dollars in millions)
Revenues from external customers:
Carbon Materials & Chemicals	$	1,015.8		$	795.6		$	655.2
Railroad & Utility Products		523.1			449.9			469.2

Total	$	1,538.9		$	1,245.5		$	1,124.4

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

Depreciation & amortization:
Carbon Materials & Chemicals^(a)	$	39.3		$	18.7		$	17.5
Railroad & Utility Products		9.5			9.4			7.3

Total	$	48.8		$	28.1		$	24.8

Operating profit:
Carbon Materials & Chemicals^(b)	$	45.4		$	77.6		$	58.5
Railroad & Utility Products		34.8			23.0			38.2
Corporate^(c)		(1.2	)		(1.6	)		(1.8	)

Total	$	79.0		$	99.0		$	94.9

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)

Depreciation includes $20.2 million of expense related to the closure of the Company's carbon black facility in Kurnell, Australia in 2011.

^(b)

Operating profit includes $41.0 million of charges related to the closure of the Company's carbon black facility in Kurnell, Australia in 2011.

^(c)

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	$	857.8	$	161.6
		2010		672.5		157.1
		2009		649.1		149.1
Australasia		2011		349.4		58.7
		2010		276.9		79.8
		2009		239.4		73.4
Europe		2011		248.0		35.7
		2010		194.0		35.8
		2009		144.1		14.9
Other countries		2011		83.7		0.0
		2010		102.1		0.0
		2009		91.8		0.0

Total		2011	$	1,538.9	$	256.0
		2010	$	1,245.5	$	272.7
		2009	$	1,124.4	$	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		148.0		104.4		76.3
Phthalic anhydride		112.4		93.9		67.3
Naphthalene		72.3		68.0		49.8
Carbon black		80.4		50.6		45.4
Other products		171.6		153.1		113.5

		1,015.8		795.6		655.2
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	$	1,538.9	$	1,245.5	$	1,124.4

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.

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
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Inventories

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Inventories

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.

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

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.

Property, Plant And Equipment [Abstract]

Property, Plant And Equipment

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment

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.

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.

Goodwill And Other Identifiable Intangible Assets [Abstract]

Goodwill And Other Identifiable Intangible Assets

12 Months Ended

Dec. 31, 2011

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

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.

Debt

12 Months Ended

Dec. 31, 2011

Debt [Abstract]

Debt

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. 7⁷/8 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.

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.

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.

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.

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.

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.

Pensions And Post-Retirement Benefit Plans [Abstract]

Pensions And Post-Retirement Benefit Plans

12 Months Ended

Dec. 31, 2011

Pensions And Post-Retirement Benefit Plans

15. Pensions and Post-retirement 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.

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, 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	$	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.

The entire disclosure for pension and other postretirement benefits.

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-Number 30
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-Number 158
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-Number FAS88
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-URI http://asc.fasb.org/topic&trid=2235017

Common Stock And Senior Convertible Preferred Stock [Abstract]

Common Stock And Senior Convertible Preferred Stock

12 Months Ended

Dec. 31, 2011

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	)

Fair Value Of Financial Instruments

12 Months Ended

Dec. 31, 2011

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial 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.

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.

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Commitments And Contingent Liabilities [Abstract]

Commitments And Contingent Liabilities

12 Months Ended

Dec. 31, 2011

Commitments And Contingent Liabilities

18. 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 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.

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.

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.

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.

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

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 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.

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 December 31, 2011.

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

The entire disclosure for commitments and contingencies.

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

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2011
Related Party Transactions [Abstract]
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. 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.

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.

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

Selected Quarterly Financial Data [Abstract]

Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2011

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	$	359.1	$	393.6	$	401.0	$	385.2		$	1,538.9
Operating profit (loss)^(a)		20.8		37.1		40.3		(19.2	)		79.0
Income (loss) from continuing operations^(a)		9.0		19.9		22.7		(14.0	)		37.6
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:

Earnings (loss) per basic common share	$	0.43	$	0.96	$	1.08	$	(0.69	)	$	1.79
Earnings (loss) 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	$	274.3	$	327.1		$	336.3	$	307.8	$	1,245.5
Operating profit		16.8		32.8			33.5		15.9		99.0
Income from continuing operations		7.4		16.3			15.8		5.2		44.7
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	$	0.36	$	0.79		$	0.76	$	0.24	$	2.15
Discontinued operations		0.00		(0.01	)		0.00		0.00		(0.01	)

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

Diluted –
Continuing operations	$	0.36	$	0.79		$	0.75	$	0.24	$	2.14
Discontinued operations		0.00		(0.01	)		0.00		0.00		(0.01	)

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

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.

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

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	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 is unable, at this time, to reasonably estimate the financial effect of the event, if any. 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.

Subsidiary Guarantor Information For Koppers Inc. Senior Notes

12 Months Ended

Dec. 31, 2011

Subsidiary Guarantor Information For Koppers Inc. Senior Notes

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 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		$	657.9	$	(45.7	)	$	1,538.9
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6			612.3		(24.3	)		1,384.7
Selling, general and administrative		1.2			41.6		1.8			30.6		0.0			75.2

Operating profit (loss)		6.6			49.6		29.2			15.0		(21.4	)		79.0
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			6.8		0.0			14.9

Income from continuing operations		36.9			14.7		28.5			3.2		(45.7	)		37.6
Discontinued operations		0.0			0.0		0.0			0.0		0.0			0.0
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

Condensed Consolidating Statement of 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		$	517.3	$	(38.8	)	$	1,245.5
Cost of sales including depreciation and amortization		0.0			657.7			19.1			432.0		(25.6	)		1,083.2
Selling, general and administrative		1.6			32.2			3.3			26.2		0.0			63.3

Operating profit (loss)		(1.6	)		31.3			23.4			59.1		(13.2	)		99.0
Other income (expense)		45.0			0.2			(0.4	)		2.1		(45.0	)		1.9
Interest expense (income)		(0.2	)		27.9			0.0			4.4		(5.0	)		27.1
Income taxes		(0.5	)		1.5			12.2			15.9		0.0			29.1

Income from continuing operations		44.1			2.1			10.8			40.9		(53.2	)		44.7
Discontinued operations		0.0			(0.0	)		(0.2	)		0.0		0.0			(0.2	)
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

Condensed Consolidating Statement of 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		$	422.3		$	(40.0	)	$	1,124.4
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		350.4			(16.2	)		971.4
Selling, general and administrative		1.8			28.8			3.0			24.5			0.0			58.1

Operating profit (loss)		(1.8	)		39.4			33.7			47.4			(23.8	)		94.9
Other income (expense)		40.2			0.5			(0.3	)		(0.9	)		(40.2	)		(0.7	)
Interest expense (income)		31.1			28.5			0.0			4.1			(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			12.3			0.0			13.8

Income from continuing operations		18.8			9.4			22.4			30.1			(59.0	)		21.7
Discontinued operations		0.0			(0.3	)		0.0			0.0			0.0			(0.3	)
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

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

12 Months Ended

Dec. 31, 2011

Subsidiary Guarantor Information For Shelf Registration [Abstract]

Subsidiary Guarantor Information For Shelf Registration

23. 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 and warrants, 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 subsidiaries in the United States, Europe and Australia. The non-guarantor subsidiaries consist of certain subsidiaries in the United States, China 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 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	$	431.3		$	264.6	$	(83.7	)	$	1,538.9
Cost of sales including depreciation and amortization		(7.8	)		762.3			41.6		407.9			221.3		(40.6	)		1,384.7
Selling, general and administrative		1.2			41.6			1.8		20.0			10.6		0.0			75.2

Operating profit (loss)		6.6			50.2			29.2		3.4			32.7		(43.1	)		79.0
Other income (expense)		29.9			(0.3	)		0.0		(0.2	)		1.2		(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		(0.3	)		7.1		0.0			14.9

Income from continuing operations		36.9			14.7			28.4		(1.8	)		25.7		(66.3	)		37.6
Discontinued operations		0.0			0.0			0.0		0.0			0.0		0.0			0.0
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

Condensed Consolidating Statement of 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		$	366.7	$	156.1	$	(44.3	)	$	1,245.5
Cost of sales including depreciation and amortization		0.0			657.7		19.3			295.2		140.4		(29.4	)		1,083.2
Selling, general and administrative		1.6			32.2		3.3			19.5		6.7		0.0			63.3

Operating profit (loss)		(1.6	)		31.3		23.2			52.0		9.0		(14.9	)		99.0
Other income (expense)		45.0			0.2		(0.4	)		1.7		0.4		(45.0	)		1.9
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			13.4		2.5		0.0			29.1

Income from continuing operations		44.1			2.1		10.7			35.1		5.9		(53.2	)		44.7
Discontinued operations		0.0			0.0		(0.2	)		0.0		0.0		0.0			(0.2	)
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

Condensed Consolidating Statement of 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		$	355.6	$	79.3		$	(52.6	)	$	1,124.4
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		296.0		67.0			(28.8	)		971.4
Selling, general and administrative		1.8			28.8			3.0			20.5		4.0			0.0			58.1

Operating profit (loss)		(1.8	)		39.4			33.7			39.1		8.3			(23.8	)		94.9
Other income (expense)		40.2			0.5			(0.3	)		0.4		(1.3	)		(40.2	)		(0.7	)
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			10.1		2.2			0.0			13.8

Income from continuing operations		18.8			9.4			22.4			25.2		4.9			(59.0	)		21.7
Discontinued operations		0.0			(0.3	)		0.0			0.0		0.0			0.0			(0.3	)
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

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

Schedule II - Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Schedule II - Valuation And Qualifying Accounts [Abstract]

Schedule II - Valuation And Qualifying Accounts

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

Summary Of Significant Accounting Policies (Policy)

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 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

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)

12 Months Ended

Dec. 31, 2011

Restructuring [Abstract]

Summary Of Restructuring Activities And Related Reserves


	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

Earnings And Dividends Per Common Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings And Dividends Per Common Share [Abstract]

Schedule 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		0.0		(0.2	)		(0.3	)

Income from continuing operations attributable to Koppers	$	36.9	$	44.3		$	19.1

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	$	1.79	$	2.15		$	0.93
Diluted earnings per common share		1.77		2.14			0.92

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

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Summary Of Performance Stock Units


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, 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 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, 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


	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

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	$	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		(11.2	)		5.0		22.9

Total income tax provision	$	14.9		$	29.1	$	13.8

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		1.3			0.7			(1.2	)
Foreign earnings taxed at different rates		(13.7	)		2.6			5.2
Domestic production activities deduction		(2.3	)		(0.7	)		0.0
Non-deductible fines and penalties		0.3			0.0			1.1
Deferred tax adjustments		0.2			0.0			(0.9	)
Change in tax contingency reserves		6.9			0.2			0.3
Other		0.7			1.7			(0.7	)

		28.4	%		39.5	%		38.8	%

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

Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Information [Abstract]

Summary Of Results Of Segment Operations


	Year Ended December 31,
	2011			2010			2009
(Dollars in millions)
Revenues from external customers:
Carbon Materials & Chemicals	$	1,015.8		$	795.6		$	655.2
Railroad & Utility Products		523.1			449.9			469.2

Total	$	1,538.9		$	1,245.5		$	1,124.4

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

Depreciation & amortization:
Carbon Materials & Chemicals^(a)	$	39.3		$	18.7		$	17.5
Railroad & Utility Products		9.5			9.4			7.3

Total	$	48.8		$	28.1		$	24.8

Operating profit:
Carbon Materials & Chemicals^(b)	$	45.4		$	77.6		$	58.5
Railroad & Utility Products		34.8			23.0			38.2
Corporate^(c)		(1.2	)		(1.6	)		(1.8	)

Total	$	79.0		$	99.0		$	94.9

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)

Depreciation includes $20.2 million of expense related to the closure of the Company's carbon black facility in Kurnell, Australia in 2011.

^(b)

Operating profit includes $41.0 million of charges related to the closure of the Company's carbon black facility in Kurnell, Australia in 2011.

^(c)

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

Summary Of 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

Schedule Of Revenues And Long-Lived Assets By Geographic Area


	Year		Revenue		Long-lived assets
(Dollars in millions)
United States		2011	$	857.8	$	161.6
		2010		672.5		157.1
		2009		649.1		149.1
Australasia		2011		349.4		58.7
		2010		276.9		79.8
		2009		239.4		73.4
Europe		2011		248.0		35.7
		2010		194.0		35.8
		2009		144.1		14.9
Other countries		2011		83.7		0.0
		2010		102.1		0.0
		2009		91.8		0.0

Total		2011	$	1,538.9	$	256.0
		2010	$	1,245.5	$	272.7
		2009	$	1,124.4	$	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		148.0		104.4		76.3
Phthalic anhydride		112.4		93.9		67.3
Naphthalene		72.3		68.0		49.8
Carbon black		80.4		50.6		45.4
Other products		171.6		153.1		113.5

		1,015.8		795.6		655.2
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	$	1,538.9	$	1,245.5	$	1,124.4

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.

Components Of Inventories

Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]


	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

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

Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment [Abstract]

Schedule Of Property, Plant And Equipment


	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

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

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.

Schedule Of Debt Maturities

Debt (Tables)

12 Months Ended

Dec. 31, 2011

Debt [Abstract]

Schedule Of Debt


						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



(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

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.

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
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-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
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-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

Future Minimum Commitments For Operating Leases

Leases (Tables)

12 Months Ended

Dec. 31, 2011

Leases [Abstract]



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

Total	$	124.8

Pensions And Post-Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Pensions And Post-Retirement Benefit Plans [Abstract]

Schedule Of Net Benefit Cost


	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, 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	$	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	)

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.

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.

Common Stock And Senior Convertible Preferred Stock [Abstract]

Common Stock And Senior Convertible Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2011

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	)

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.

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
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-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
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-Paragraph 10
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Paragraph 2
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-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

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Company's Financial Instruments


	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.

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.

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)
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 12
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-Section 50
-Paragraph 30
-Subparagraph (a)
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 2
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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

Commitments And Contingent Liabilities [Abstract]

Commitments And Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

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


	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

Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data [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	$	359.1	$	393.6	$	401.0	$	385.2		$	1,538.9
Operating profit (loss)^(a)		20.8		37.1		40.3		(19.2	)		79.0
Income (loss) from continuing operations^(a)		9.0		19.9		22.7		(14.0	)		37.6
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:

Earnings (loss) per basic common share	$	0.43	$	0.96	$	1.08	$	(0.69	)	$	1.79
Earnings (loss) 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	$	274.3	$	327.1		$	336.3	$	307.8	$	1,245.5
Operating profit		16.8		32.8			33.5		15.9		99.0
Income from continuing operations		7.4		16.3			15.8		5.2		44.7
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	$	0.36	$	0.79		$	0.76	$	0.24	$	2.15
Discontinued operations		0.00		(0.01	)		0.00		0.00		(0.01	)

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

Diluted –
Continuing operations	$	0.36	$	0.79		$	0.75	$	0.24	$	2.14
Discontinued operations		0.00		(0.01	)		0.00		0.00		(0.01	)

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

Subsidiary Guarantor Information For Koppers Inc. Senior Notes (Tables)

12 Months Ended

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 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		$	657.9	$	(45.7	)	$	1,538.9
Cost of sales including depreciation and amortization		(7.8	)		762.9		41.6			612.3		(24.3	)		1,384.7
Selling, general and administrative		1.2			41.6		1.8			30.6		0.0			75.2

Operating profit (loss)		6.6			49.6		29.2			15.0		(21.4	)		79.0
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			6.8		0.0			14.9

Income from continuing operations		36.9			14.7		28.5			3.2		(45.7	)		37.6
Discontinued operations		0.0			0.0		0.0			0.0		0.0			0.0
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

Condensed Consolidating Statement of 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		$	517.3	$	(38.8	)	$	1,245.5
Cost of sales including depreciation and amortization		0.0			657.7			19.1			432.0		(25.6	)		1,083.2
Selling, general and administrative		1.6			32.2			3.3			26.2		0.0			63.3

Operating profit (loss)		(1.6	)		31.3			23.4			59.1		(13.2	)		99.0
Other income (expense)		45.0			0.2			(0.4	)		2.1		(45.0	)		1.9
Interest expense (income)		(0.2	)		27.9			0.0			4.4		(5.0	)		27.1
Income taxes		(0.5	)		1.5			12.2			15.9		0.0			29.1

Income from continuing operations		44.1			2.1			10.8			40.9		(53.2	)		44.7
Discontinued operations		0.0			(0.0	)		(0.2	)		0.0		0.0			(0.2	)
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

Condensed Consolidating Statement of 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		$	422.3		$	(40.0	)	$	1,124.4
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		350.4			(16.2	)		971.4
Selling, general and administrative		1.8			28.8			3.0			24.5			0.0			58.1

Operating profit (loss)		(1.8	)		39.4			33.7			47.4			(23.8	)		94.9
Other income (expense)		40.2			0.5			(0.3	)		(0.9	)		(40.2	)		(0.7	)
Interest expense (income)		31.1			28.5			0.0			4.1			(5.0	)		58.7
Income taxes		(11.5	)		2.0			11.0			12.3			0.0			13.8

Income from continuing operations		18.8			9.4			22.4			30.1			(59.0	)		21.7
Discontinued operations		0.0			(0.3	)		0.0			0.0			0.0			(0.3	)
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

Schedule Of Subsidiary Guarantor Information For Senior Notes Condensed Consolidating Balance Sheet

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 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)

12 Months Ended

Dec. 31, 2011

Subsidiary Guarantor Information For Shelf Registration [Abstract]

Condensed Consolidating Statement Of Income

Condensed Consolidating Statement of 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	$	431.3		$	264.6	$	(83.7	)	$	1,538.9
Cost of sales including depreciation and amortization		(7.8	)		762.3			41.6		407.9			221.3		(40.6	)		1,384.7
Selling, general and administrative		1.2			41.6			1.8		20.0			10.6		0.0			75.2

Operating profit (loss)		6.6			50.2			29.2		3.4			32.7		(43.1	)		79.0
Other income (expense)		29.9			(0.3	)		0.0		(0.2	)		1.2		(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		(0.3	)		7.1		0.0			14.9

Income from continuing operations		36.9			14.7			28.4		(1.8	)		25.7		(66.3	)		37.6
Discontinued operations		0.0			0.0			0.0		0.0			0.0		0.0			0.0
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

Condensed Consolidating Statement of 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		$	366.7	$	156.1	$	(44.3	)	$	1,245.5
Cost of sales including depreciation and amortization		0.0			657.7		19.3			295.2		140.4		(29.4	)		1,083.2
Selling, general and administrative		1.6			32.2		3.3			19.5		6.7		0.0			63.3

Operating profit (loss)		(1.6	)		31.3		23.2			52.0		9.0		(14.9	)		99.0
Other income (expense)		45.0			0.2		(0.4	)		1.7		0.4		(45.0	)		1.9
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			13.4		2.5		0.0			29.1

Income from continuing operations		44.1			2.1		10.7			35.1		5.9		(53.2	)		44.7
Discontinued operations		0.0			0.0		(0.2	)		0.0		0.0		0.0			(0.2	)
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

Condensed Consolidating Statement of 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		$	355.6	$	79.3		$	(52.6	)	$	1,124.4
Cost of sales including depreciation and amortization		0.0			640.9			(3.7	)		296.0		67.0			(28.8	)		971.4
Selling, general and administrative		1.8			28.8			3.0			20.5		4.0			0.0			58.1

Operating profit (loss)		(1.8	)		39.4			33.7			39.1		8.3			(23.8	)		94.9
Other income (expense)		40.2			0.5			(0.3	)		0.4		(1.3	)		(40.2	)		(0.7	)
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			10.1		2.2			0.0			13.8

Income from continuing operations		18.8			9.4			22.4			25.2		4.9			(59.0	)		21.7
Discontinued operations		0.0			(0.3	)		0.0			0.0		0.0			0.0			(0.3	)
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

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

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

Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions		3 Months Ended								12 Months Ended
	Oct. 15, 2009 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 ($)	Dec. 31, 2011 USD ($) years	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2004 USD ($)
Summary Of Significant Accounting Policies [Line Items]
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
Net sales		$ 385.2	$ 401.0	$ 393.6	$ 359.1	$ 307.8	$ 336.3	$ 327.1	$ 274.3	1,538.9	1,245.5	1,124.4
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
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage		50.00%								50.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage		20.00%								20.00%
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum \| years										20
Estimated useful lives, minimum \| years										10
Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum \| years										10
Estimated useful lives, minimum \| years										3
Interest Rate Swap [Member]
Summary Of Significant Accounting Policies [Line Items]
Swap was terminated which resulted in a gain	$ 1.6
Untreated Crosstie Sales [Member]
Summary Of Significant Accounting Policies [Line Items]
Net sales										$ 116.5	$ 106.4	$ 119.1

Summary Of Significant Accounting Policies (Schedule Of Self-Insured Liabilities Occurred Result Of Favorable Loss Trends Related To Self Insured Claims) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
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	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
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 Significant Accounting Policies (Summary Of Changes To Deferred Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
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 (Narrative) (Details)
$ in Millions

3 Months Ended

12 Months Ended

Feb. 28, 2010

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 ($)

Coal tar plant, capacity (in metric tons) | MT

140,000

Pro forma revenue

$ 1,280.4

$ 1,191.9

Pro forma operating profit

100.1

91.0

$ 385.2

$ 401.0

$ 393.6

$ 359.1

$ 307.8

$ 336.3

$ 327.1

$ 274.3

$ 1,538.9

1,245.5

1,124.4

$ (19.2)

^[1]

$ 40.3

^[1]

$ 37.1

^[1]

$ 20.8

^[1]

$ 15.9

$ 33.5

$ 32.8

$ 16.8

79.0

^[1]

99.0

94.9

Koppers Netherlands [Member]

$ 48.8

28.1

24.8

Business acquisition cash

Company acquired percent

100.00%

$ 21.6

Inventory acquired

7.1

Plant and equipment acquired

8.7

48.4

0.8

1.2

4.4

Portec [Member]

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 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]

Carbon Materials & Chemicals Segment [Member] | Koppers Netherlands [Member]

Acquisition expenses

$ 1.8

$ 1.7

Goodwill income tax not deductible

$ 6.1

Lease Agreements [Member] | Koppers Netherlands [Member]

Remaining Amortization Period (In Years)

three

Coal Supply Agreements [Member] | Koppers Netherlands [Member]

$ 0.8

Customer Relationships [Member] | Koppers Netherlands [Member]

$ 2.9

Remaining Amortization Period (In Years)

ten

$ 0.7

[1]

Business Acquisitions (Schedule Of The Identifiable Assets Acquired And Liabilities Assumed Upon The Acquisition) (Details) - Koppers Netherlands [Member] $ in Millions	Feb. 28, 2010 USD ($)
Business Acquisition [Line Items]
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 (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Restructuring (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Costs related to closure	$ 41.0
Estimated total future closure costs		$ 1.7
Future completion period, closure		2014
Cost Of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Costs related to closure	20.8
Depreciation And Amortization [Member]
Restructuring Cost and Reserve [Line Items]
Costs related to closure	$ 20.2

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.

Earnings And Dividends Per Common Share [Abstract]

Restructuring (Summary Of Restructuring Activities And Related Reserves) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	$ 0.0
Charges	41.0
Costs charged against assets	(23.5)
Cash paid	(1.6)
Reserve at December 31, 2011	15.9
Severance And Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	0.0
Charges	3.4
Costs charged against assets	0.0
Cash paid	(1.6)
Reserve at December 31, 2011	1.8
Environmental Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	0.0
Charges	6.7
Costs charged against assets	0.0
Cash paid	0.0
Reserve at December 31, 2011	6.7
Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	0.0
Charges	20.2
Costs charged against assets	(20.2)
Cash paid	0.0
Reserve at December 31, 2011	0.0
Inventory Writedowns [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	0.0
Charges	3.3
Costs charged against assets	(3.3)
Cash paid	0.0
Reserve at December 31, 2011	0.0
Site Demolition [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	0.0
Charges	6.2
Costs charged against assets	0.0
Cash paid	0.0
Reserve at December 31, 2011	6.2
Restructuring Activities Other [Member]
Restructuring Cost and Reserve [Line Items]
Reserve at January 1, 2011	0.0
Charges	1.2
Costs charged against assets	0.0
Cash paid	0.0
Reserve at December 31, 2011	$ 1.2

Earnings And Dividends Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions

3 Months Ended

12 Months Ended

Feb. 15, 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

Less: discontinued operations

$ (14.2)

^[1]

$ 22.4

^[1]

$ 19.8

^[1]

$ 8.9

^[1]

$ 5.1

$ 15.6

$ 16.1

$ 7.3

$ 36.9

^[1]

$ 44.1

$ 18.8

0.0

(0.2)

(0.3)

Income from continuing operations attributable to Koppers

$ 36.9

$ 44.3

$ 19.1

Basic

20,599

20,543

20,446

Effect of dilutive securities

234

133

115

Diluted

20,833

20,676

20,561

Basic earnings per common share

$ 0.24

$ 0.76

$ 0.79

$ 0.36

$ 1.79

$ 2.15

$ 0.93

Diluted earnings per common share

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

106

154

103

Dividends declared per common share

$ 0.24

$ 0.22

$ 0.88

[1]

Stock-Based Compensation (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) months years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vesting period in years	3 years
Stock options, term in years \| years	10
Future compensation expense related to non-vested stock-based compensation arrangements \| $	$ 7.3
Future compensation expense, Weighted average period over which it is expected to be recognized in months \| months	23
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award the participants earn	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award the participants earn	150.00%

Stock-Based Compensation (Summary Of Performance Stock Units) (Details) - shares	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	353,452	291,591
2009-2011 [Member] \| Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	134,928
2009-2011 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	0
2009-2011 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	202,392
2010-2011 [Member] \| Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	65,411
2010-2011 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	0
2010-2011 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	98,117
2011-2012 [Member] \| Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	89,056
2011-2012 [Member] \| Performance Stock Units [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	0
2011-2012 [Member] \| Performance Stock Units [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding	133,584

Stock-Based Compensation (Summary Of Non-Vested Stock Activity) (Details)	12 Months Ended
	Dec. 31, 2011 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at January 1, 2011	378,399
Granted	153,616
Credited from dividends	11,320
Performance stock unit adjustment	(50,600)
Vested	(23,580)
Forfeited	(14,775)
Non-vested at December 31, 2011	454,380
Nonvested at January 1, 2011, Weighted Average Grant Date Fair Value per Unit \| $ / shares	$ 23.31
Granted, Weighted Average Grant Date Fair Value per Unit \| $ / shares	$ 40.41
Credited from dividends, Weighted Average Grant Date Fair Value per Unit \| $	$ 27.31
Performance stock unit adjustment, Weighted Average Grant Date Fair Value per Unit \| $ / shares	38.92
Vested, Weighted Average Grant Date Fair Value per Unit \| $ / shares	$ 38.92
Forfeited, Weighted Average Grant Date Fair Value per Unit \| $ / shares	29.96
Non-vested at December 31, 2011, Weighted Average Grant Date Fair Value per Unit \| $ / shares	$ 26.43
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at January 1, 2011	121,397
Granted	60,501
Credited from dividends	3,627
Performance stock unit adjustment	0
Vested	(23,580)
Forfeited	(5,280)
Non-vested at December 31, 2011	156,665
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at January 1, 2011	257,002
Granted	93,115
Credited from dividends	7,693
Performance stock unit adjustment	(50,600)
Vested	0
Forfeited	(9,495)
Non-vested at December 31, 2011	297,715

Stock-Based Compensation (Stock Options Fair Value Assumptions) (Details)	12 Months Ended
	Dec. 31, 2011 years $ / shares
February 2011 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date price per share of option award	$ 40.26
Expected dividend yield per share	2.50%
Expected life in years \| years	6.5
Expected volatility	60.00%
Risk-free interest rate	3.02%
Grant date fair value per share of option awards	$ 19.28
August 2010 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date price per share of option award	$ 20.00
Expected dividend yield per share	2.50%
Expected life in years \| years	6.5
Expected volatility	62.00%
Risk-free interest rate	3.05%
Grant date fair value per share of option awards	$ 9.82
February 2010 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date price per share of option award	$ 28.10
Expected dividend yield per share	2.50%
Expected life in years \| years	6.5
Expected volatility	62.00%
Risk-free interest rate	3.05%
Grant date fair value per share of option awards	$ 13.81
February 2009 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date price per share of option award	$ 15.26
Expected dividend yield per share	2.50%
Expected life in years \| years	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)	12 Months Ended
	Dec. 31, 2011 USD ($) years $ / shares shares
Stock-Based Compensation [Abstract]
Outstanding at January 1, 2011 \| shares	291,591
Granted \| shares	73,910
Exercised \| shares	(7,150)
Forfeited \| shares	(4,899)
Outstanding at December 31, 2011 \| shares	353,452
Exercisable at December 31, 2011 \| shares	95,568
Outstanding at January 1, 2011, Weighted Average Exercise Price per Option \| $ / shares	$ 24.63
Granted, Weighted Average Exercise Price per Option \| $ / shares	40.26
Exercised, Weighted Average Exercise Price per Option \| $ / shares	29.97
Forfeited, Weighted Average Exercise Price per Option \| $ / shares	34.64
Outstanding at December 31, 2011, Weighted Average Exercise Price per Option \| $ / shares	27.65
Exercisable at December 31, 2011, Weighted Average Exercise Price per Option \| $ / shares	$ 34.70
Outstanding at December 31, 2011, Weighted Average Remaining Contractual Term (in years) \| years	7.27
Exercisable at December 31, 2011, Weighted Average Remaining Contractual Term (in years) \| years	5.51
Outstanding at December 31, 2011, Aggregate Intrinsic Value \| $	$ 3.0
Exercisable at December 31, 2011, Aggregate Intrinsic Value \| $	$ 0.2

Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation [Abstract]
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

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.

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Loss Carryforwards [Line Items]
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
Net operating losses	11.2	10.6
Unrecognized tax benefits	7.1	3.5
Interest expense and related penalties	0.2	0.2	$ 0.1
Accrued interest expense and penalties	0.9	$ 0.7
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 14.3
Operating losses expiration	2014 to 2030
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 2.0
Operating losses expiration	2019

Income Taxes (Summary Of Income Tax Provision) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
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)
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	(11.3)	5.0	22.9
Total income tax provision	$ 14.9	$ 29.1	$ 13.8

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-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 08
-Paragraph h
-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Paragraph Question 1-7

Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-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.

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

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 45
-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 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-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 Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-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 08
-Paragraph h
-Article 4

Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

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-Name Accounting Standards Codification
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-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-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 Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-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
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-Paragraph 1
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 9
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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-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.

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's net foreign deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of applicable enacted tax laws of countries other than the country of domicile.

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 45
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-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
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-Name Accounting Standards Codification
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-Paragraph 1
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Subparagraph (b)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-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 Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-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 FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-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 SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws.

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 45
-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 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-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.

Income Taxes (Summary Of Income Taxes Reconciled With The Federal Statutory Rates) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.30%	0.70%	(1.20%)
Foreign earnings taxed at different rates	(13.70%)	2.60%	5.20%
Domestic production activities deduction	(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	6.90%	0.20%	0.30%
Other	0.70%	1.70%	(0.70%)
Total effective tax rate	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
Income Taxes [Abstract]
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
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
Income Taxes [Abstract]
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

Segment Information (Narrative) (Details) $ in Millions	3 Months Ended								12 Months Ended
Segment Information (Narrative) (Details) $ in Millions	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 ($)
Segment Reporting Information [Line Items]
Number of reportable segments									2
Revenues from external customers	$ 385.2	$ 401.0	$ 393.6	$ 359.1	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Revenue percentage											11.00%
Non-U.S. Countries [Member]
Segment Reporting Information [Line Items]
Revenues from external customers									$ 681.1	$ 573.0	$ 475.3

Segment Information (Summary Of Results Of Segment Operations) (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

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

Depreciation & amortization

$ 385.2

$ 401.0

$ 393.6

$ 359.1

$ 307.8

$ 336.3

$ 327.1

$ 274.3

$ 1,538.9

$ 1,245.5

$ 1,124.4

48.8

28.1

24.8

$ (19.2)

^[1]

$ 40.3

^[1]

$ 37.1

^[1]

$ 20.8

^[1]

$ 15.9

$ 33.5

$ 32.8

$ 16.8

79.0

^[1]

99.0

94.9

Carbon Materials & Chemicals [Member]

33.8

65.4

20.2

Depreciation

46.0

25.6

22.8

Depreciation & amortization

1,015.8

795.6

655.2

Intersegment revenues

95.2

97.2

91.5

^[2]

39.3

18.7

17.5

^[3]

45.4

77.6

58.5

Railroad & Utility Products [Member]

23.0

44.9

10.7

Depreciation & amortization

523.1

449.9

469.2

9.5

9.4

7.3

34.8

23.0

38.2

10.2

20.2

8.5

Corporate [Member]

^[4]

(1.2)

(1.6)

(1.8)

Carbon Black [Member] | Carbon Materials & Chemicals [Member]

0.6

0.3

1.0

80.4

50.6

45.4

Australia [Member]

Australia [Member] | Carbon Black [Member]

349.4

$ 276.9

$ 239.4

41.0

Depreciation

$ 20.2

[1]	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, 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.
[2]	Depreciation includes $20.2 million of expense related to the closure of the Company's carbon black facility in Kurnell, Australia in 2011.
[3]	Operating profit includes $41.0 million of charges related to the closure of the Company's carbon black facility in Kurnell, Australia in 2011.
[4]	Operating loss for Corporate includes general and administrative costs for Koppers Holdings Inc, the parent company of Koppers Inc.

Segment Information (Summary Of Assets And Goodwill By Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Segment Reporting Information [Line Items]
Segment assets	$ 730.7	$ 669.2
Cash and cash equivalents	54.1	35.3	$ 58.4	$ 63.1
Income tax receivable	10.6	11.9
Deferred taxes	41.8	27.1
Deferred financing costs	8.3	9.1
Deferred charges	3.5	4.0
Other	6.6	6.4
Goodwill	72.1	72.1	$ 61.6
Carbon Materials & Chemicals [Member]
Segment Reporting Information [Line Items]
Segment assets	495.2	447.4
Goodwill	69.4	69.6
Railroad & Utility Products [Member]
Segment Reporting Information [Line Items]
Segment assets	164.6	154.8
Goodwill	2.7	2.5
Segment Assets [Member]
Segment Reporting Information [Line Items]
Segment assets	659.8	602.2
Cash And Cash Equivalents [Member]
Segment Reporting Information [Line Items]
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
	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
Segment Reporting Information [Line Items]
Revenues from external customers	$ 385.2	$ 401.0	$ 393.6	$ 359.1	$ 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]
Segment Reporting Information [Line Items]
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]
Segment Reporting Information [Line Items]
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]
Segment Reporting Information [Line Items]
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]
Segment Reporting Information [Line Items]
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
	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
Segment Reporting Information [Line Items]
Net sales	$ 385.2	$ 401.0	$ 393.6	$ 359.1	$ 307.8	$ 336.3	$ 327.1	$ 274.3	$ 1,538.9	$ 1,245.5	$ 1,124.4
Carbon Materials & Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales									1,015.8	795.6	655.2
Carbon Materials & Chemicals [Member] \| Carbon Pitch [Member]
Segment Reporting Information [Line Items]
Net sales									431.1	325.6	302.9
Carbon Materials & Chemicals [Member] \| Creosote And Carbon Black Feedstock [Member]
Segment Reporting Information [Line Items]
Net sales									148.0	104.4	76.3
Carbon Materials & Chemicals [Member] \| Phthalic Anhydride [Member]
Segment Reporting Information [Line Items]
Net sales									112.4	93.9	67.3
Carbon Materials & Chemicals [Member] \| Naphthalene [Member]
Segment Reporting Information [Line Items]
Net sales									72.3	68.0	49.8
Carbon Materials & Chemicals [Member] \| Carbon Black [Member]
Segment Reporting Information [Line Items]
Net sales									80.4	50.6	45.4
Carbon Materials & Chemicals [Member] \| Other Products [Member]
Segment Reporting Information [Line Items]
Net sales									171.6	153.1	113.5
Railroad & Utility Products [Member]
Segment Reporting Information [Line Items]
Net sales									523.1	449.9	469.2
Railroad & Utility Products [Member] \| Railroad Crossties [Member]
Segment Reporting Information [Line Items]
Net sales									324.9	282.5	298.1
Railroad & Utility Products [Member] \| Utility Poles [Member]
Segment Reporting Information [Line Items]
Net sales									84.2	73.3	66.8
Railroad & Utility Products [Member] \| Creosote [Member]
Segment Reporting Information [Line Items]
Net sales									52.7	57.9	60.6
Railroad & Utility Products [Member] \| Rail Joint Bars [Member]
Segment Reporting Information [Line Items]
Net sales									24.7	0.1	0.0
Railroad & Utility Products [Member] \| Other Products [Member]
Segment Reporting Information [Line Items]
Net sales									$ 36.6	$ 36.1	$ 43.7

Inventories (Components Of Inventories) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2010
Inventories [Abstract]
Raw materials	$ 91.5		$ 107.6
Work in process	20.1		7.6
Finished goods	95.1		95.0
Inventory, gross	206.7		210.2
Less revaluation to LIFO	47.7		44.8
Net	159.0		$ 165.4
Increase in operating profit due to LIFO liquidations	$ 0.3	$ 1.2

Equity Investments (Narrative) (Details)	Dec. 31, 2011
KSA Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Tangshan Koppers Kailuan Carbon Chemical Company Limited [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	30.00%

Equity Investments (Equity Earnings (Losses) And Total Dividends Received) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity Investments [Abstract]
Equity income (loss)	$ 0.2	$ 0.0	$ (1.5)
Dividends received	$ 0.0	$ 0.0	$ 0.5

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.

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

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 [Abstract]
Depreciation	$ 46.0	$ 25.6	$ 22.8
Impairment charges	$ 20.2	$ 1.8

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 634.8	$ 649.6
Less accumulated depreciation	479.2	481.4
Net	155.6	168.2
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6.6	7.6
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34.7	36.5
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 593.5	$ 605.5

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.

Goodwill And Other Identifiable Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) years	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Finite-Lived Intangible Assets [Line Items]
Increase to intangible assets due to acquisitions		$ 7.4
Amortization expense	$ 1.5	1.2	$ 0.8
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| years	10
Supply Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| years	10
Favorable Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years \| years	3
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives, in years	3
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

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
Goodwill And Other Identifiable Intangible Assets [Line Items]
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]
Goodwill And Other Identifiable Intangible Assets [Line Items]
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]
Goodwill And Other Identifiable Intangible Assets [Line Items]
Balance beginning	2.5	2.2
Acquisitions	0.3	0.0
Currency translation	(0.1)	0.3
Balance ending	$ 2.7	$ 2.5

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.

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.

Goodwill And Other Identifiable Intangible Assets (Schedule Of Identifiable Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 17.0	$ 18.0
Accumulated Amortization	9.0	7.5
Net	8.0	10.5
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12.3	13.2
Accumulated Amortization	6.8	5.9
Net	5.5	7.3
Supply Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2.7	2.8
Accumulated Amortization	0.5	0.2
Net	2.2	2.6
Favorable Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0.8	0.8
Accumulated Amortization	0.5	0.2
Net	0.3	0.6
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
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 ($)
Goodwill And Other Identifiable Intangible Assets [Abstract]
2012	$ 1.5
2013	1.3
2014	1.2
2015	1.2
2016	$ 0.8

Debt (Narrative) (Details) - USD ($)		12 Months Ended
Debt (Narrative) (Details) - USD ($)	Oct. 15, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 01, 2009
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 0	$ 0	$ (22,400,000)
Accumulated amortization		3,400,000	2,100,000
Unamortized deferred financing costs		8,300,000	9,100,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity		300,000,000
Line of credit facility, commitment fees		1,100,000	$ 1,300,000	$ 1,800,000
Debt instrument, unused borrowing capacity		275,800,000
Letters of credit, amount outstanding		$ 14,200,000
Debt, weighted average interest rate		2.55%
Debt, maturity date		2015
Debt instrument, issuance date		December 1, 2009
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate		7.875%
Debt, maturity date		2019
Debt instrument, offering price percentage		98.311%
Debt instrument, offering value		$ 294,900,000
Debt instrument, face amount		$ 300,000,000			$ 300,000,000
Debt instrument, effective interest rate		8.125%
Debt instrument, redemption price percentage		103.938%
Other Debt, Including Capital Leases [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate		0.00%
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt, maturity date				2013
Debt instrument, effective interest rate				9.875%
Loss on extinguishment of debt				$ 9,200,000
Bond premium				6,100,000
Accumulated amortization				$ 3,100,000
Senior Discount Notes [Member]
Debt Instrument [Line Items]
Debt, maturity date				2014
Debt instrument, face amount				$ 203,000,000
Debt instrument, effective interest rate				9.875%
Loss on extinguishment of debt				$ 13,200,000
Bond premium				10,000,000
Accumulated amortization				2,600,000
Bond tender expense				600,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional fixed-interest rate debt				$ 50,000,000
Swap was terminated which resulted in a gain	$ 1,600,000

Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	12 Months Ended
Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
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 [Member]
Debt Instrument [Line Items]
Revolving Credit Facility	$ 6.4	0.0
Debt, Weighted Average Interest Rate	2.55%
Debt, Maturity	2015
Senior Notes [Member]
Debt Instrument [Line Items]
Senior Notes	$ 295.7	295.3
Long-term debt (excluding current portion)	$ 295.0
Debt, Weighted Average Interest Rate	7.875%
Debt, Maturity	2019
Other Debt, Including Capital Leases [Member]
Debt Instrument [Line Items]
Other debt, including capital leases	$ 0.0	$ 1.1
Debt, Weighted Average Interest Rate	0.00%

Debt (Schedule Of Debt Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Debt [Abstract]
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	$ 296.4

Leases (Future Minimum Commitments For Operating Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases [Abstract]
2012	$ 38.1
2013	27.9
2014	13.5
2015	7.9
2016	6.3
Thereafter	31.1
Total	124.8
Operating lease expense	$ 43.8	$ 42.5	$ 41.5

Pensions And Post-Retirement Benefit Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) years	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans expense	$ 4.8	$ 4.7	$ 2.5
Multi-employer contribution plan expense	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 \| years	20
Operating expense	$ 5.6	$ 5.0	$ 4.5
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions by the employer	$ 12.9
Expected return on plan assets	7.68%	7.65%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions by the employer	$ 1.0
Initial health care cost trend rate	7.80%	8.00%
Growth Seeking Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation investment strategy, minimum	50.00%
Target allocation investment strategy, maximum	75.00%
Income Generating Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation investment strategy, minimum	25.00%
Target allocation investment strategy, maximum	50.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Initial health care cost trend rate	8.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Initial health care cost trend rate	4.50%

Pensions And Post-Retirement Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
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 Post-Retirement Benefit Plans (Schedule Of Change In The Funded Status Of The Pension And Post-Retirement Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 141.6
Fair value of plan assets at end of year	146.6	$ 141.6
Noncurrent liabilities	104.1	86.1
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	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	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]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	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
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 Post-Retirement Benefit Plans (Schedule Of Projected Benefit Payments) (Details) $ in Millions	Dec. 31, 2011 USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 12.1
2013	10.8
2014	11.6
2015	11.9
2016	13.1
2017-2021	72.0
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	1.0
2013	0.9
2014	0.9
2015	0.9
2016	0.9
2017-2021	$ 4.6

Pensions And Post-Retirement Benefit Plans (Schedule Of Weighted-Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.37%	5.09%
Initial medical trend rate	7.80%	8.00%

Pensions And Post-Retirement Benefit Plans (Schedule Of Weighted Average Asset Allocation For The Company's Pension Plans) (Details)	Dec. 31, 2011	Dec. 31, 2010
Pensions And Post-Retirement Benefit Plans [Abstract]
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 Post-Retirement Benefit Plans (Schedule Of Pension Plan Assets At Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 146.6	$ 141.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	146.6	141.6
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
U.S. Equity Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	71.8	70.3
U.S. Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
International Equity Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	22.6	25.3
International Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
U.S. Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
U.S. Debt Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	22.0	18.5
U.S. Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
International Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
International Debt Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	22.4	19.3
International Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Real Estate And Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Real Estate And Other Investments [Member] \| Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1.6	1.6
Real Estate And Other Investments [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
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]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Cash And Cash Equivalents [Member] \| Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6.2	6.6
Cash And Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 0.0	$ 0.0

Pensions And Post-Retirement Benefit Plans (Schedule Of Health Care Cost Trend Rates) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Pensions And Post-Retirement Benefit Plans [Abstract]
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)

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
Common Stock And Senior Convertible Preferred Stock [Abstract]
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)

Number of shares issued during the period as a result of an employee stock purchase plan.

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value Of Financial Instruments (Schedule Of Company's Financial Instruments) (Details) - USD ($)
$ in Millions

Dec. 31, 2011

Dec. 31, 2010

Fair Value [Member]

Cash and cash equivalents

$ 54.1

$ 35.3

Investments and other assets

^[1]

1.3

Long-term debt (including current portion)

324.4

324.5

Carrying Value [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash and cash equivalents

54.1

35.3

Investments and other assets

^[1]

1.3

Long-term debt (including current portion)

$ 302.1

$ 296.4

[1]	Excludes equity method investments.

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.

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).

Commitments And Contingent Liabilities (Narrative) (Details)	1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2010 USD ($)	Jul. 31, 2004 USD ($)	Dec. 31, 2011 USD ($) lawsuits	Dec. 31, 2011 USD ($) lawsuits plaintiffs	Dec. 31, 2010 USD ($) lawsuits plaintiffs	Dec. 31, 2011	Dec. 31, 2011 USD ($)
Commitments And Contingent Liabilities [Line Items]
Number of plaintiffs \| plaintiffs				131	111
Number of cases \| lawsuits			73	73	62
Litigation expense					$ 3,000,000
Environmental legal indemnification expense		$ 7,000,000
Environmental remediation costs paid by others				$ 15,000,000
Environmental remediation reserve				$ 8,000,000	$ 1,200,000
Reduction to reserve due to sale of property	$ (2,900,000)
Accrued liability for environmental matters, current							$ 8,100,000
Gainesville Plant [Member]
Commitments And Contingent Liabilities [Line Items]
Number of plaintiffs				3
Number of new defendants				twenty-six
Pennsylvania [Member]
Commitments And Contingent Liabilities [Line Items]
Number of cases			66	66		66
Arkansas [Member]
Commitments And Contingent Liabilities [Line Items]
Number of cases \| lawsuits			4	4
Tennessee [Member]
Commitments And Contingent Liabilities [Line Items]
Number of cases \| lawsuits			1	1
Compensatory damages				$ 15,000,000
Indiana [Member]
Commitments And Contingent Liabilities [Line Items]
Number of cases \| lawsuits			1	1
Illinois [Member]
Commitments And Contingent Liabilities [Line Items]
Number of cases \| lawsuits			1	1
Australia [Member]
Commitments And Contingent Liabilities [Line Items]
Environmental remediation expense			$ 6,700,000	$ 1,600,000
Environmental remediation reserve	$ 1,300,000		$ 8,000,000
Amount contributable by third party							7,500,000
Net amount contributed by third party							4,000,000
Domestic [Member]
Commitments And Contingent Liabilities [Line Items]
Estimate of remediation expense by others				100,000,000
Environmental Contingencies Company has not provided a reserve							$ 700,000
Environmental remediation reserve				300,000
Minimum [Member] \| Arkansas [Member]
Commitments And Contingent Liabilities [Line Items]
Compensatory damages				50,000
Minimum [Member] \| Illinois [Member]
Commitments And Contingent Liabilities [Line Items]
Compensatory damages				$ 50,000

Commitments And Contingent Liabilities (Changes In Accrued Liability For Legal Proceedings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingent Liabilities [Abstract]
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	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingent Liabilities [Abstract]
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

Related Party Transactions (Details) - USD ($)	12 Months Ended
Related Party Transactions (Details) - USD ($)	Dec. 31, 2011	Nov. 30, 2011	Dec. 31, 2010	Dec. 01, 2009
Related Party Transaction [Line Items]
Long-term debt	$ 302,100,000		$ 295,400,000
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
Debt instrument, offering value	$ 294,900,000
Debt instrument, offering price percentage	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%

Selected Quarterly Financial Data (Schedule Of Selected Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

12 Months Ended

Feb. 15, 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

Income (loss) from continuing operations

$ 385.2

$ 401.0

$ 393.6

$ 359.1

$ 307.8

$ 336.3

$ 327.1

$ 274.3

$ 1,538.9

$ 1,245.5

$ 1,124.4

Operating profit (loss)

(19.2)

^[1]

40.3

^[1]

37.1

^[1]

20.8

^[1]

15.9

33.5

32.8

16.8

79.0

^[1]

99.0

94.9

(14.0)

^[1]

22.7

^[1]

19.9

^[1]

9.0

^[1]

5.2

15.8

16.3

7.4

37.6

^[1]

44.7

21.7

Net income (loss)

(14.0)

^[1]

22.7

^[1]

19.9

^[1]

9.0

^[1]

5.2

15.8

16.1

7.4

37.6

^[1]

44.5

21.4

Net income (loss) attributable to Koppers

$ (14.2)

^[1]

$ 22.4

^[1]

$ 19.8

^[1]

$ 8.9

^[1]

$ 5.1

$ 15.6

$ 16.1

$ 7.3

$ 36.9

^[1]

$ 44.1

$ 18.8

$ 0.24

$ 0.76

$ 0.79

$ 0.36

$ 1.79

$ 2.15

$ 0.93

Earnings (loss) per basic common share

0.00

(0.01)

0.00

(0.01)

$ (0.69)

$ 1.08

$ 0.96

$ 0.43

0.24

0.76

0.78

0.36

1.79

2.14

0.92

0.24

0.75

0.79

0.36

1.77

2.14

0.92

Earnings (loss) per diluted common share

0.00

(0.01)

0.00

(0.01)

(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

$ 0.22

0.22

0.88

$ 0.88

Costs related to closure

$ 41.0

Cost Of Sales [Member]

Depreciation And Amortization [Member]

Costs related to closure

20.8

Costs related to closure

$ 20.2

Minimum [Member]

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]

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

[1]

Subsequent Events (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2011
Costs related to closure	$ 41.0
Wood Treating Facility [Member]
Costs related to closure		$ 2.5

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Subsidiary Guarantor Information For Koppers Inc. Senior Notes (Narrative) (Details) - USD ($)	Dec. 31, 2011	Dec. 01, 2009
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 300,000,000	$ 300,000,000

Subsidiary Guarantor Information For Koppers Inc. Senior Notes (Condensed Consolidating Income Statement) (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

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

$ 385.2

$ 401.0

$ 393.6

$ 359.1

$ 307.8

$ 336.3

$ 327.1

$ 274.3

$ 1,538.9

$ 1,245.5

$ 1,124.4

75.2

63.3

58.1

(19.2)

^[1]

40.3

^[1]

37.1

^[1]

20.8

^[1]

15.9

33.5

32.8

16.8

79.0

^[1]

99.0

94.9

0.7

1.9

(0.7)

27.2

27.1

36.3

14.9

29.1

13.8

Net income attributable to noncontrolling interests

(14.0)

^[1]

22.7

^[1]

19.9

^[1]

9.0

^[1]

5.2

15.8

16.3

7.4

37.6

^[1]

44.7

21.7

0.7

0.4

2.6

Koppers Inc. Senior Notes [Member]

$ (14.2)

^[1]

$ 22.4

^[1]

$ 19.8

^[1]

$ 8.9

^[1]

$ 5.1

$ 15.6

$ 16.1

$ 7.3

36.9

^[1]

44.1

18.8

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Cost of sales including depreciation and amortization

1,538.9

1,245.5

1,124.4

1,384.7

1,083.2

971.4

75.2

63.3

58.1

79.0

99.0

94.9

0.7

1.9

(0.7)

27.2

27.1

58.7

14.9

29.1

13.8

37.6

44.7

21.7

Net income attributable to noncontrolling interests

0.0

(0.2)

(0.3)

0.7

0.4

2.6

Koppers Inc. Senior Notes [Member] | Parent [Member]

36.9

44.1

18.8

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Cost of sales including depreciation and amortization

0.0

(7.8)

0.0

1.2

1.6

1.8

6.6

(1.6)

(1.8)

29.9

45.0

40.2

0.0

(0.2)

31.1

(0.4)

(0.5)

(11.5)

36.9

44.1

18.8

Net income attributable to noncontrolling interests

0.0

0.0

Koppers Inc. Senior Notes [Member] | Koppers Inc. [Member]

36.9

44.1

18.8

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Cost of sales including depreciation and amortization

854.1

721.2

709.1

762.9

657.7

640.9

41.6

32.2

28.8

49.6

31.3

39.4

0.3

0.2

0.5

27.5

27.9

28.5

7.7

1.5

2.0

14.7

2.1

9.4

Net income attributable to noncontrolling interests

0.0

(0.3)

0.0

Koppers Inc. Senior Notes [Member] | Domestic Guarantor Subsidiaries [Member]

14.7

2.1

9.1

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Cost of sales including depreciation and amortization

72.6

45.8

33.0

41.6

19.1

(3.7)

1.8

3.3

3.0

29.2

23.4

33.7

0.0

(0.4)

(0.3)

(0.1)

0.0

0.8

12.2

11.0

28.5

10.8

22.4

Net income attributable to noncontrolling interests

0.0

(0.2)

0.0

0.0

Koppers Inc. Senior Notes [Member] | Non-Guarantor Subsidiaries [Member]

28.5

10.6

22.4

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Cost of sales including depreciation and amortization

657.9

517.3

422.3

612.3

432.0

350.4

30.6

26.2

24.5

15.0

59.1

47.4

0.4

2.1

(0.9)

5.4

4.4

4.1

6.8

15.9

12.3

3.2

40.9

30.1

Net income attributable to noncontrolling interests

0.0

0.7

0.4

2.6

Koppers Inc. Senior Notes [Member] | Consolidating Adjustments [Member]

2.5

40.5

27.5

Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]

Cost of sales including depreciation and amortization

(45.7)

(38.8)

(40.0)

(24.3)

(25.6)

(16.2)

0.0

(21.4)

(13.2)

(23.8)

(29.9)

(45.0)

(40.2)

(5.6)

(5.0)

0.0

(45.7)

(53.2)

(59.0)

Net income attributable to noncontrolling interests

0.0

0.0

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

$ (45.7)

$ (53.2)

$ (59.0)

[1]

Subsidiary Guarantor Information For Koppers Inc. Senior Notes (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	$ 54.1	$ 35.3	$ 58.4	$ 63.1
Accounts receivable, net	160.9	128.9
Inventories, net	159.0	165.4
Deferred tax assets	9.3	5.9
Other current assets	21.8	23.0
Total current assets	427.4	370.4
Equity investments	4.9	4.7
Property, plant and equipment, net	155.6	168.2
Goodwill	72.1	72.1	61.6
Deferred tax assets	44.3	26.1
Other noncurrent assets	26.4	27.7
Total assets	730.7	669.2
Accounts payable	102.1	87.9
Accrued liabilities	63.1	55.4
Short-term debt and current portion of long-term debt	0.0	1.0
Total current liabilities	170.4	149.4
Long-term debt	302.1	295.4
Other long-term liabilities	46.9	38.4
Total liabilities	623.5	569.3
Total Koppers shareholders' equity	94.8	88.7
Noncontrolling interests	12.4	11.2
Total liabilities and equity	730.7	669.2
Koppers Inc. Senior Notes [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	54.1	35.3	58.4	63.1
S-T investments & restricted cash		0.0
Accounts receivable, net	171.5	140.8
Inventories, net	159.0	165.4
Deferred tax assets	9.3	5.9
Other current assets	33.5	23.0
Total current assets	427.4	370.4
Equity investments	4.9	4.7
Property, plant and equipment, net	155.6	168.2
Goodwill	72.1	72.1
Deferred tax assets	44.3	26.1
Other noncurrent assets	26.4	27.7
Total assets	730.7	669.2
Accounts payable	102.1	87.9
Accrued liabilities	68.3	60.5
Short-term debt and current portion of long-term debt	0.0	1.0
Total current liabilities	170.4	149.4
Long-term debt	302.1	295.4
Other long-term liabilities	151.0	124.5
Total liabilities	623.5	569.3
Total Koppers shareholders' equity	94.8	88.7
Noncontrolling interests	12.4	11.2
Total liabilities and equity	730.7	669.2
Koppers Inc. Senior Notes [Member] \| Parent [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	0.0	0.0	0.2	0.0
S-T investments & restricted cash		0.0
Accounts receivable, net	5.5	16.6
Inventories, net	0.0	0.0
Deferred tax assets	0.0	0.0
Other current assets	0.0	0.0
Total current assets	5.5	16.6
Equity investments	93.9	76.7
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Deferred tax assets	0.0	0.0
Other noncurrent assets	0.0	0.0
Total assets	99.4	93.3
Accounts payable	0.1	0.0
Accrued liabilities	4.5	4.6
Short-term debt and current portion of long-term debt	0.0	0.0
Total current liabilities	4.6	4.6
Long-term debt	0.0	0.0
Other long-term liabilities	0.0	0.0
Total liabilities	4.6	4.6
Total Koppers shareholders' equity	94.8	88.7
Noncontrolling interests	0.0	0.0
Total liabilities and equity	99.4	93.3
Koppers Inc. Senior Notes [Member] \| Koppers Inc. [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	0.0	8.4	12.9	37.5
S-T investments & restricted cash		0.0
Accounts receivable, net	112.6	80.3
Inventories, net	74.8	78.3
Deferred tax assets	10.7	7.4
Other current assets	6.8	6.9
Total current assets	204.9	181.3
Equity investments	77.1	77.1
Property, plant and equipment, net	102.0	94.7
Goodwill	39.8	39.5
Deferred tax assets	43.7	65.4
Other noncurrent assets	18.4	21.6
Total assets	485.9	479.6
Accounts payable	344.5	492.5
Accrued liabilities	27.2	(6.3)
Short-term debt and current portion of long-term debt	0.0	0.1
Total current liabilities	371.7	486.3
Long-term debt	400.8	295.4
Other long-term liabilities	116.5	99.6
Total liabilities	889.0	881.3
Total Koppers shareholders' equity	(403.1)	(401.7)
Noncontrolling interests	0.0	0.0
Total liabilities and equity	485.9	479.6
Koppers Inc. Senior Notes [Member] \| Domestic Guarantor Subsidiaries [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	0.0
S-T investments & restricted cash		0.0
Accounts receivable, net	284.0	460.9
Inventories, net	0.0	1.2
Deferred tax assets	(1.5)	(1.5)
Other current assets	0.3	0.3
Total current assets	282.8	460.9
Equity investments	26.3	26.2
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Deferred tax assets	(10.5)	(43.8)
Other noncurrent assets	131.3	0.0
Total assets	429.9	443.3
Accounts payable	9.6	15.1
Accrued liabilities	(0.6)	34.8
Short-term debt and current portion of long-term debt	0.0	0.0
Total current liabilities	9.0	49.9
Long-term debt	0.0	0.0
Other long-term liabilities	2.5	3.0
Total liabilities	11.5	52.9
Total Koppers shareholders' equity	418.4	390.4
Noncontrolling interests	0.0	0.0
Total liabilities and equity	429.9	443.3
Koppers Inc. Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	54.1	26.9	45.3	25.6
S-T investments & restricted cash		0.0
Accounts receivable, net	79.2	107.2
Inventories, net	84.2	85.9
Deferred tax assets	0.1	0.0
Other current assets	26.4	15.8
Total current assets	244.0	235.8
Equity investments	3.9	3.8
Property, plant and equipment, net	53.6	73.5
Goodwill	32.3	32.6
Deferred tax assets	11.1	4.5
Other noncurrent assets	44.4	6.2
Total assets	389.3	356.4
Accounts payable	57.5	104.5
Accrued liabilities	37.4	27.4
Short-term debt and current portion of long-term debt	0.0	0.9
Total current liabilities	94.9	132.8
Long-term debt	69.0	0.0
Other long-term liabilities	32.0	21.9
Total liabilities	195.9	154.7
Total Koppers shareholders' equity	181.0	190.5
Noncontrolling interests	12.4	11.2
Total liabilities and equity	389.3	356.4
Koppers Inc. Senior Notes [Member] \| Consolidating Adjustments [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
S-T investments & restricted cash		0.0
Accounts receivable, net	(309.8)	(524.2)
Inventories, net	0.0	0.0
Deferred tax assets	0.0	0.0
Other current assets	0.0	0.0
Total current assets	(309.8)	(524.2)
Equity investments	(196.3)	(179.1)
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Deferred tax assets	0.0	0.0
Other noncurrent assets	(167.7)	(0.1)
Total assets	(673.8)	(703.4)
Accounts payable	(309.8)	(524.2)
Accrued liabilities	0.0	0.0
Short-term debt and current portion of long-term debt	0.0	0.0
Total current liabilities	(309.8)	(524.2)
Long-term debt	(167.7)	0.0
Other long-term liabilities	0.0	0.0
Total liabilities	(477.5)	(524.2)
Total Koppers shareholders' equity	(196.3)	(179.2)
Noncontrolling interests	0.0	0.0
Total liabilities and equity	$ (673.8)	$ (703.4)

Subsidiary Guarantor Information For Koppers Inc. Senior Notes (Condensed Consolidating Cash Flow) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	$ 76.9	$ 105.3	$ 112.3
Capital expenditures and acquisitions	(33.2)	(29.9)	(18.0)
Loan to related party	11.7	0.0
Net cash proceeds (payments) from divestitures and asset sales	0.8	2.0	(0.6)
Net cash (used in) investing activities	(44.7)	(63.4)	(20.8)
Deferred financing costs	(0.5)	(0.4)	(8.1)
Dividends paid	(18.2)	(23.1)	(18.0)
Net cash provided by (used in) financing activities	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	35.3	58.4	63.1
Cash and cash equivalents at end of year	54.1	35.3	58.4
Koppers Inc. Senior Notes [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	76.9	105.3	112.3
Capital expenditures and acquisitions	(33.8)	(65.4)	(20.2)
Loan to related party	(11.7)
Net cash proceeds (payments) from divestitures and asset sales	0.8	2.0	(0.6)
Net cash (used in) investing activities	(44.7)	(63.4)	(20.8)
Borrowings (repayments) of long-term debt	5.4	(40.2)	(70.8)
Deferred financing costs	(0.5)	(0.4)	(8.1)
Dividends paid	(18.2)	(23.1)	(18.0)
Stock issued (repurchased)		(0.6)
Net cash provided by (used in) financing activities	(13.3)	(64.3)	(96.9)
Effect of exchange rates on cash	(0.1)	(0.7)	0.7
Net increase (decrease) in cash and cash equivalents	18.8	(23.1)	(4.7)
Cash and cash equivalents at beginning of year	35.3	58.4	63.1
Cash and cash equivalents at end of year	54.1	35.3	58.4
Koppers Inc. Senior Notes [Member] \| Parent [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	18.1	18.7	231.8
Capital expenditures and acquisitions	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
Net cash (used in) investing activities	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	(213.6)
Deferred financing costs	0.0	0.0	0.0
Dividends paid	(18.1)	(18.1)	(18.0)
Stock issued (repurchased)		(0.8)
Net cash provided by (used in) financing activities	(18.1)	(18.9)	(231.6)
Effect of exchange rates on cash	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	(0.2)	0.2
Cash and cash equivalents at beginning of year	0.0	0.2	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.2
Koppers Inc. Senior Notes [Member] \| Koppers Inc. [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	9.5	75.2	90.7
Capital expenditures and acquisitions	(24.5)	(35.0)	(15.0)
Loan to related party	0.0
Net cash proceeds (payments) from divestitures and asset sales	0.7	0.2	(0.7)
Net cash (used in) investing activities	(23.8)	(34.8)	(15.7)
Borrowings (repayments) of long-term debt	6.3	(40.2)	142.8
Deferred financing costs	(0.5)	(0.4)	(8.1)
Dividends paid	0.0	(4.5)	(232.7)
Stock issued (repurchased)		0.2
Net cash provided by (used in) financing activities	5.8	(44.9)	(98.0)
Effect of exchange rates on cash	0.1	0.0	(1.6)
Net increase (decrease) in cash and cash equivalents	(8.4)	(4.5)	(24.6)
Cash and cash equivalents at beginning of year	8.4	12.9	37.5
Cash and cash equivalents at end of year	0.0	8.4	12.9
Koppers Inc. Senior Notes [Member] \| Domestic Guarantor Subsidiaries [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	0.0	0.0	0.0
Capital expenditures and acquisitions	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
Net cash (used in) investing activities	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0
Deferred financing costs	0.0	0.0	0.0
Dividends paid	0.0	0.0	0.0
Stock issued (repurchased)		0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0
Effect of exchange rates on cash	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0
Koppers Inc. Senior Notes [Member] \| Non-Guarantor Subsidiaries [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	49.3	15.9	22.5
Capital expenditures and acquisitions	(9.3)	(30.4)	(5.2)
Loan to related party	(11.7)
Net cash proceeds (payments) from divestitures and asset sales	0.1	1.8	0.1
Net cash (used in) investing activities	(20.9)	(28.6)	(5.1)
Borrowings (repayments) of long-term debt	(0.9)	0.0	0.0
Deferred financing costs	0.0	0.0	0.0
Dividends paid	(0.1)	(5.0)	0.0
Stock issued (repurchased)		0.0
Net cash provided by (used in) financing activities	(1.0)	(5.0)	0.0
Effect of exchange rates on cash	(0.2)	(0.7)	2.3
Net increase (decrease) in cash and cash equivalents	27.2	(18.4)	19.7
Cash and cash equivalents at beginning of year	26.9	45.3	25.6
Cash and cash equivalents at end of year	54.1	26.9	45.3
Koppers Inc. Senior Notes [Member] \| Consolidating Adjustments [Member]
Subsidiary Guarantor Information For Subsidiary Senior Notes [Line Items]
Cash provided by (used in) operating activities	0.0	(4.5)	(232.7)
Capital expenditures and acquisitions	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
Net cash (used in) investing activities	0.0	0.0	0.0
Borrowings (repayments) of long-term debt	0.0	0.0	0.0
Deferred financing costs	0.0	0.0	0.0
Dividends paid	0.0	4.5	232.7
Stock issued (repurchased)		0.0
Net cash provided by (used in) financing activities	0.0	4.5	232.7
Effect of exchange rates on cash	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0
Cash and cash equivalents at end of year	$ 0.0	$ 0.0	$ 0.0

Subsidiary Guarantor Information For Shelf Registration (Condensed Consolidating Statement Of Income) (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

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

$ 385.2

$ 401.0

$ 393.6

$ 359.1

$ 307.8

$ 336.3

$ 327.1

$ 274.3

$ 1,538.9

$ 1,245.5

$ 1,124.4

75.2

63.3

58.1

(19.2)

^[1]

40.3

^[1]

37.1

^[1]

20.8

^[1]

15.9

33.5

32.8

16.8

79.0

^[1]

99.0

94.9

0.7

1.9

(0.7)

27.2

27.1

36.3

14.9

29.1

13.8

Net income attributable to noncontrolling interests

(14.0)

^[1]

22.7

^[1]

19.9

^[1]

9.0

^[1]

5.2

15.8

16.3

7.4

37.6

^[1]

44.7

21.7

0.7

0.4

2.6

Shelf Registration [Member]

$ (14.2)

^[1]

$ 22.4

^[1]

$ 19.8

^[1]

$ 8.9

^[1]

$ 5.1

$ 15.6

$ 16.1

$ 7.3

36.9

^[1]

44.1

18.8

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

1,538.9

1,245.5

1,124.4

1,384.7

1,083.2

971.4

75.2

63.3

58.1

79.0

99.0

94.9

0.7

1.9

(0.7)

27.2

27.1

58.7

14.9

29.1

13.8

37.6

44.7

21.7

Net income attributable to noncontrolling interests

0.0

(0.2)

(0.3)

0.7

0.4

2.6

Shelf Registration [Member] | Parent [Member]

36.9

44.1

18.8

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

0.0

(7.8)

0.0

1.2

1.6

1.8

6.6

(1.6)

(1.8)

29.9

45.0

40.2

0.0

(0.2)

31.1

(0.4)

(0.5)

(11.5)

36.9

44.1

18.8

Net income attributable to noncontrolling interests

0.0

0.0

Shelf Registration [Member] | Koppers Inc. [Member]

36.9

44.1

18.8

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

854.1

721.2

709.1

762.3

657.7

640.9

41.6

32.2

28.8

50.2

31.3

39.4

(0.3)

0.2

0.5

27.5

27.9

28.5

7.7

1.5

2.0

14.7

2.1

9.4

Net income attributable to noncontrolling interests

0.0

(0.3)

0.0

Shelf Registration [Member] | Domestic Guarantor Subsidiaries [Member]

14.7

2.1

9.1

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

72.6

45.8

33.0

41.6

19.3

(3.7)

1.8

3.3

3.0

29.2

23.2

33.7

0.0

(0.4)

(0.3)

0.0

(0.1)

0.0

0.8

12.2

11.0

28.4

10.7

22.4

Net income attributable to noncontrolling interests

0.0

(0.2)

0.0

0.0

Shelf Registration [Member] | Foreign Guarantor Subsidiaries [Member]

28.4

10.5

22.4

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

431.3

366.7

355.6

407.9

295.2

296.0

20.0

19.5

20.5

3.4

52.0

39.1

(0.2)

1.7

0.4

5.3

5.2

4.2

(0.3)

13.4

10.1

(1.8)

35.1

25.2

Net income attributable to noncontrolling interests

0.0

0.0

Shelf Registration [Member] | Non-Guarantor Subsidiaries [Member]

(1.8)

35.1

25.2

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

264.6

156.1

79.3

221.3

140.4

67.0

10.6

6.7

4.0

32.7

9.0

8.3

1.2

0.4

(1.3)

1.1

1.0

(0.1)

7.1

2.5

2.2

25.7

5.9

4.9

Net income attributable to noncontrolling interests

0.0

0.7

0.4

2.6

Shelf Registration [Member] | Consolidating Adjustments [Member]

25.0

5.5

2.3

Subsidiary Guarantor Information For Sale Of Combination Of Securities [Line Items]

Cost of sales including depreciation and amortization

(83.7)

(44.3)

(52.6)

(40.6)

(29.4)

(28.8)

0.0

(43.1)

(14.9)

(23.8)

(29.9)

(45.0)

(40.2)

(6.7)

(5.0)

0.0

(66.3)

(53.2)

(59.0)

Net income attributable to noncontrolling interests

0.0

0.0