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Summary of Significant Accounting Policies - Basis of presentation and description of business (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
channel
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]    
Number of products sales channels | channel 2  
Ownership percentage 50.00%  
Net investment | $ $ 14.1 $ 13.6
Comfort Revolution    
Business Acquisition [Line Items]    
Equity method investment, ownership percentage 45.00%