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Net Sales - Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 1,132.3 $ 821.0 $ 2,619.9 $ 2,234.7
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,132.3 821.0 2,619.9 2,234.7
Operating Segments | United States        
Disaggregation of Revenue [Line Items]        
Net sales 904.3 621.4 2,078.8 1,652.3
Operating Segments | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 72.2 60.6 145.4 161.8
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 155.8 139.0 395.7 420.6
Operating Segments | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 1,036.6 752.2 2,399.7 2,044.6
Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 95.7 68.8 220.2 190.1
Operating Segments | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 987.2 710.1 2,273.3 1,958.2
Operating Segments | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 145.1 110.9 346.6 276.5
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Net sales 976.5 682.0 2,224.2 1,814.1
Operating Segments | North America | United States        
Disaggregation of Revenue [Line Items]        
Net sales 904.3 621.4 2,078.8 1,652.3
Operating Segments | North America | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 72.2 60.6 145.4 161.8
Operating Segments | North America | International        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Operating Segments | North America | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 913.0 640.6 2,086.3 1,709.2
Operating Segments | North America | Other        
Disaggregation of Revenue [Line Items]        
Net sales 63.5 41.4 137.9 104.9
Operating Segments | North America | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 869.1 602.2 1,973.3 1,632.5
Operating Segments | North America | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 107.4 79.8 250.9 181.6
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 155.8 139.0 395.7 420.6
Operating Segments | International | United States        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Operating Segments | International | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Operating Segments | International | International        
Disaggregation of Revenue [Line Items]        
Net sales 155.8 139.0 395.7 420.6
Operating Segments | International | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 123.6 111.6 313.4 335.4
Operating Segments | International | Other        
Disaggregation of Revenue [Line Items]        
Net sales 32.2 27.4 82.3 85.2
Operating Segments | International | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 118.1 107.9 300.0 325.7
Operating Segments | International | Direct        
Disaggregation of Revenue [Line Items]        
Net sales $ 37.7 $ 31.1 $ 95.7 $ 94.9