Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Narrative (Details)

v3.8.0.1
Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]          
Payments to Acquire Businesses, Gross     $ 36.1 $ 0.0 $ 0.0
Gross Carrying Amount     45.3 10.9  
Intangible asset impairment     12.5 0.0 $ 0.0
Trademarks and brand names          
Indefinite-lived Intangible Assets [Line Items]          
Intangible asset impairment $ 12.5        
Vinyl Composition Tile Assets Of Mannington Mills, Inc. [Member]          
Indefinite-lived Intangible Assets [Line Items]          
Payments to Acquire Businesses, Gross   $ 36.1      
Indefinite-lived Intangible Assets Acquired   33.6      
Business Combination, Contingent Consideration, Liability     9.0    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes In Each Measurement Period, Value, Low     0.0    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes In Each Measurement Period, Value, High     4.5    
Contractual Rights          
Indefinite-lived Intangible Assets [Line Items]          
Gross Carrying Amount     38.8 5.1  
Contractual Rights | Vinyl Composition Tile Assets Of Mannington Mills, Inc. [Member]          
Indefinite-lived Intangible Assets [Line Items]          
Gross Carrying Amount   $ 33.3      
Estimated useful lives of finite-lived intangible assets   5 years      
Intellectual Property          
Indefinite-lived Intangible Assets [Line Items]          
Gross Carrying Amount     $ 6.5 $ 5.8  
Intellectual Property | Vinyl Composition Tile Assets Of Mannington Mills, Inc. [Member]          
Indefinite-lived Intangible Assets [Line Items]          
Gross Carrying Amount   $ 0.3      
Estimated useful lives of finite-lived intangible assets   2 years