Document And Entity Information - USD ($) $ in Billions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Feb. 19, 2025 |
Jun. 28, 2024 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Dec. 31, 2024 | ||
| Document Fiscal Year Focus | 2024 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Registrant Name | ARMSTRONG WORLD INDUSTRIES, INC. | ||
| Trading Symbol | AWI | ||
| Entity Central Index Key | 0000007431 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Shell Company | false | ||
| Entity File Number | 1-2116 | ||
| Entity Tax Identification Number | 23-0366390 | ||
| Entity Address, Address Line One | 2500 Columbia Avenue | ||
| Entity Address, City or Town | Lancaster | ||
| Entity Address, State or Province | PA | ||
| Entity Address, Postal Zip Code | 17603 | ||
| City Area Code | 717 | ||
| Local Phone Number | 397-0611 | ||
| Entity Emerging Growth Company | false | ||
| Entity Small Business | false | ||
| Document Annual Report | true | ||
| Title of 12(b) Security | Common Stock, $0.01 par value per share | ||
| Security Exchange Name | NYSE | ||
| Entity Incorporation, State or Country Code | PA | ||
| Document Transition Report | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Interactive Data Current | Yes | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Common Stock, Shares Outstanding | 43,464,252 | ||
| Entity Public Float | $ 4.9 | ||
| Documents Incorporated by Reference | Documents Incorporated by Reference Certain sections of Armstrong World Industries, Inc.’s definitive Proxy Statement for use in connection with its 2025 annual meeting of shareholders, to be filed no later than April 30, 2025 (120 days after the last day of our 2024 fiscal year), are incorporated by reference into Part III of this Form 10-K Report where indicated. |
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| Auditor Name | KPMG LLP | ||
| Auditor Location | Philadelphia, PA | ||
| Auditor Firm ID | 185 | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Auditor Opinion [Text Block] | Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Armstrong World Industries, Inc. and subsidiaries (the Company) as of December 31, 2024 and 2023, the related consolidated statements of earnings and comprehensive income, shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes and financial statement schedule II (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 25, 2025 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting. |