Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Document and Entity Information [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2020  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-37589  
Entity Registrant Name ARMSTRONG FLOORING, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-4303305  
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 672-9611  
Title of 12(b) Security Common Stock, $0.0001 par value  
Trading Symbol AFI  
Security Exchange Name NYSE  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag true  
Entity Shell Company false  
Entity Public Float $ 53.0  
Entity Common Stock, Shares Outstanding   21,664,811
Documents Incorporated by Reference Certain sections of Armstrong Flooring, Inc.’s definitive Proxy Statement for use in connection with its 2021 annual meeting of stockholders, to be filed no later than April 30, 2021 (120 days after the last day of our 2020 fiscal year), are incorporated by reference into Part III of this Form 10-K Report where indicated.  
Amendment Flag false  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2020  
Entity Central Index Key 0001655075