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Revenue Recognition - Sales (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
product_category
channel
Mar. 31, 2017
USD ($)
Disaggregation of Revenue [Line Items]    
Net sales $ 648.0 $ 722.1
Number of products sales channels | channel 2  
Number of product categories | product_category 2  
United States    
Disaggregation of Revenue [Line Items]    
Net sales   533.5
Canada    
Disaggregation of Revenue [Line Items]    
Net sales   48.8
Operating Segments | United States    
Disaggregation of Revenue [Line Items]    
Net sales $ 440.2  
Operating Segments | Canada    
Disaggregation of Revenue [Line Items]    
Net sales 44.8  
Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Net sales 163.0  
Operating Segments | Bedding products    
Disaggregation of Revenue [Line Items]    
Net sales 585.5  
Operating Segments | Other products    
Disaggregation of Revenue [Line Items]    
Net sales 62.5  
Operating Segments | Wholesale    
Disaggregation of Revenue [Line Items]    
Net sales 588.2  
Operating Segments | Direct    
Disaggregation of Revenue [Line Items]    
Net sales 59.8  
Operating Segments | North America    
Disaggregation of Revenue [Line Items]    
Net sales 485.0 582.3
Operating Segments | North America | United States    
Disaggregation of Revenue [Line Items]    
Net sales 440.2  
Operating Segments | North America | Canada    
Disaggregation of Revenue [Line Items]    
Net sales 44.8  
Operating Segments | North America | International    
Disaggregation of Revenue [Line Items]    
Net sales 0.0  
Operating Segments | North America | Bedding products    
Disaggregation of Revenue [Line Items]    
Net sales 452.3  
Operating Segments | North America | Other products    
Disaggregation of Revenue [Line Items]    
Net sales 32.7  
Operating Segments | North America | Wholesale    
Disaggregation of Revenue [Line Items]    
Net sales 454.0  
Operating Segments | North America | Direct    
Disaggregation of Revenue [Line Items]    
Net sales 31.0  
Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Net sales 163.0 $ 139.8
Operating Segments | International | United States    
Disaggregation of Revenue [Line Items]    
Net sales 0.0  
Operating Segments | International | Canada    
Disaggregation of Revenue [Line Items]    
Net sales 0.0  
Operating Segments | International | Bedding products    
Disaggregation of Revenue [Line Items]    
Net sales 133.2  
Operating Segments | International | Other products    
Disaggregation of Revenue [Line Items]    
Net sales 29.8  
Operating Segments | International | Wholesale    
Disaggregation of Revenue [Line Items]    
Net sales 134.2  
Operating Segments | International | Direct    
Disaggregation of Revenue [Line Items]    
Net sales $ 28.8