Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Narrative (Details)

v3.10.0.1
Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items]        
Payments to acquire businesses   $ 0.0 $ 36.1 $ 0.0
Intangible assets assigned   41.4 41.5  
Vinyl Composition Tile Assets Of Mannington Mills, Inc. [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Payments to acquire businesses $ 36.1      
Purchase price allocated to indefinite-lived Intangible assets 33.6      
Contingent consideration, liability   9.0    
Contingent consideration, range of outcomes in each measurement period, low   0.0    
Contingent consideration, range of outcomes In each measurement Period, high   4.5    
Contractual Rights        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets assigned   $ 36.4 36.6  
Estimated useful lives of finite-lived intangible assets   5 years    
Contractual Rights | Vinyl Composition Tile Assets Of Mannington Mills, Inc. [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets assigned $ 33.3      
Estimated useful lives of finite-lived intangible assets 5 years      
Intellectual Property        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets assigned   $ 5.0 $ 4.9  
Intellectual Property | Vinyl Composition Tile Assets Of Mannington Mills, Inc. [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets assigned $ 0.3      
Estimated useful lives of finite-lived intangible assets 2 years