SEC Filing Details Document Details Form 10-Q Filing Date Nov 8, 2024 Document Date Sep 30, 2024 Form Description Quarterly report which provides a continuing view of a company's financial position Filing Group Quarterly Filings Company Koppers Holdings, Inc. Issuer Koppers Holdings Inc. Filing Formats iXBRL View HTML Download PDF Download DOC Download XLS XBRL XBRL Viewer EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA XML - XBRL INSTANCE DOCUMENT