| Document and Entity Information | Feb. 17, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001655075 |
| Document Type | 8-K |
| Document Period End Date | Feb. 17, 2021 |
| Entity Registrant Name | ARMSTRONG FLOORING, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-37589 |
| Entity Tax Identification Number | 47-4303305 |
| Entity Address, Address Line One | 2500 Columbia Avenue P.O. Box 3025 |
| 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 | 672-9611 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Security 12b Title | Common Stock, $0.0001 par value |
| Trading Symbol | AFI |
| Security Exchange Name | NYSE |
