Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Feb. 28, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
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 Accelerated Filer    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Public Float     $ 129.9
Entity Common Stock, Shares Outstanding   21,520,225  
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001655075    
Current Fiscal Year End Date --12-31