Document and Entity Information
Document and Entity Information | Sep. 30, 2019 |
Cover [Abstract] | |
Entity Registrant Name | ARMSTRONG WORLD INDUSTRIES INC |
Amendment Flag | true |
Amendment Description | Amendment 1 |
Entity Central Index Key | 0000007431 |
Document Type | 8-K/A |
Document Period End Date | Sep. 30, 2019 |
Entity Incorporation, State or Country Code | PA |
Entity File Number | 1-2116 |
Entity Tax Identification Number | 23-0366390 |
Entity Address, Address Line One | 2500 Columbia Avenue P.O. Box 3001 |
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 |
Written Communications | false |
Soliciting Material | false |
Pre-commencement Tender Offer | false |
Pre-commencement Issuer Tender Offer | false |
Title of 12(b) Security | Common Stock, $0.01 par value per share |
Trading Symbol | AWI |
Security Exchange Name | NYSE |
Entity Emerging Growth Company | false |