Quarterly report pursuant to Section 13 or 15(d)

Relationship with AWI and Related Entities (Details)

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Relationship with AWI and Related Entities (Details) - Armstrong World Industries - Allocation of corporate and other expenses - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Related Party Transaction [Line Items]    
Expenses from transactions with related party $ 0.8 $ 9.4
Cost of goods sold    
Related Party Transaction [Line Items]    
Expenses from transactions with related party 0.0 2.3
Selling, general and administrative expenses    
Related Party Transaction [Line Items]    
Expenses from transactions with related party 0.5 7.3
Other non-operating (income)    
Related Party Transaction [Line Items]    
Expenses from transactions with related party 0.0 (0.2)
Other non-operating expense    
Related Party Transaction [Line Items]    
Expenses from transactions with related party $ 0.3 $ 0.0