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Revenue Recognition - Sales (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
product_category
channel
Sep. 30, 2018
USD ($)
Disaggregation of Revenue [Line Items]        
Net sales $ 821.0 $ 729.5 $ 2,234.7 $ 2,026.8
Number of products sales channels | channel     2  
Number of product categories | product_category     2  
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 821.0 729.5 $ 2,234.7 2,026.8
Operating Segments | United States        
Disaggregation of Revenue [Line Items]        
Net sales 621.4 536.8 1,652.3 1,454.6
Operating Segments | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 60.6 59.0 161.8 154.0
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 139.0 133.7 420.6 418.2
Operating Segments | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 752.2 671.3 2,044.6 1,848.6
Operating Segments | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 68.8 58.2 190.1 178.2
Operating Segments | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 710.1 660.9 1,958.2 1,845.6
Operating Segments | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 110.9 68.6 276.5 181.2
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Net sales 682.0 595.8 1,814.1 1,608.6
Operating Segments | North America | United States        
Disaggregation of Revenue [Line Items]        
Net sales 621.4 536.8 1,652.3 1,454.6
Operating Segments | North America | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 60.6 59.0 161.8 154.0
Operating Segments | North America | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 640.6 563.0 1,709.2 1,512.7
Operating Segments | North America | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 41.4 32.8 104.9 95.9
Operating Segments | North America | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 602.2 553.6 1,632.5 1,501.9
Operating Segments | North America | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 79.8 42.2 181.6 106.7
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 139.0 133.7 420.6 418.2
Operating Segments | International | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 111.6 108.3 335.4 335.9
Operating Segments | International | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 27.4 25.4 85.2 82.3
Operating Segments | International | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 107.9 107.3 325.7 343.7
Operating Segments | International | Direct        
Disaggregation of Revenue [Line Items]        
Net sales $ 31.1 $ 26.4 $ 94.9 $ 74.5