Quarterly report pursuant to Section 13 or 15(d)


Cover - shares
9 Months Ended
Sep. 30, 2020
Oct. 26, 2020
Dec. 31, 2019
Cover [Abstract]      
Document Type 10-Q    
Document Period End Date Sep. 30, 2020    
Document Quarterly Report true    
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 Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   21,626,222  
Entity Central Index Key 0001655075    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus Q3    
Common stock, outstanding (in shares) 21,626,222   21,519,761