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Revenue Recognition - Sales (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
product_category
channel
Sep. 30, 2017
USD ($)
Disaggregation of Revenue [Line Items]        
Net sales $ 729.5 $ 711.5 $ 2,026.8 $ 2,069.2
Number of products sales channels | channel     2  
Number of product categories | product_category     2  
United States        
Disaggregation of Revenue [Line Items]        
Net sales   517.8   1,522.5
Canada        
Disaggregation of Revenue [Line Items]        
Net sales   62.8   165.8
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 729.5   $ 2,026.8  
Operating Segments | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 59.0   154.0  
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 133.7   418.2  
Operating Segments | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 671.3   1,848.6  
Operating Segments | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 58.2   178.2  
Operating Segments | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 660.9   1,845.6  
Operating Segments | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 68.6   181.2  
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Net sales 595.8 580.6 1,608.6 1,688.3
Operating Segments | North America | United States        
Disaggregation of Revenue [Line Items]        
Net sales 536.8   1,454.6  
Operating Segments | North America | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 59.0      
Operating Segments | North America | International        
Disaggregation of Revenue [Line Items]        
Net sales 0.0   0.0  
Operating Segments | North America | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 563.0   1,512.7  
Operating Segments | North America | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 32.8   95.9  
Operating Segments | North America | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 553.6   1,501.9  
Operating Segments | North America | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 42.2   106.7  
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 133.7 $ 130.9 418.2 $ 380.9
Operating Segments | International | United States        
Disaggregation of Revenue [Line Items]        
Net sales 0.0   0.0  
Operating Segments | International | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 0.0   0.0  
Operating Segments | International | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 108.3   335.9  
Operating Segments | International | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 25.4   82.3  
Operating Segments | International | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 107.3   343.7  
Operating Segments | International | Direct        
Disaggregation of Revenue [Line Items]        
Net sales $ 26.4   $ 74.5