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Net Sales - Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Net sales $ 1,169.1 $ 665.2 $ 2,212.9 $ 1,487.6
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,169.1 665.2 2,212.9 1,487.6
Operating Segments | United States        
Disaggregation of Revenue [Line Items]        
Net sales 946.3 542.0 1,764.8 1,174.5
Operating Segments | All Other        
Disaggregation of Revenue [Line Items]        
Net sales 222.8 123.2 448.1 313.1
Operating Segments | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 1,081.4 605.9 2,033.4 1,362.3
Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 87.7 59.3 179.5 125.3
Operating Segments | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 1,005.4 563.7 1,886.8 1,286.1
Operating Segments | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 163.7 101.5 326.1 201.5
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Net sales 1,013.8 578.6 1,897.1 1,270.9
Operating Segments | North America | United States        
Disaggregation of Revenue [Line Items]        
Net sales 946.3 542.0    
Operating Segments | North America | All Other        
Disaggregation of Revenue [Line Items]        
Net sales 67.5 36.6 132.3 96.4
Operating Segments | North America | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 962.5 540.3 1,792.8 1,195.2
Operating Segments | North America | Other        
Disaggregation of Revenue [Line Items]        
Net sales 51.3 38.3 104.3 75.7
Operating Segments | North America | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 890.8 502.8 1,656.3 1,127.5
Operating Segments | North America | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 123.0 75.8 240.8 143.4
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 155.3 86.6 315.8 216.7
Operating Segments | International | United States        
Disaggregation of Revenue [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Operating Segments | International | All Other        
Disaggregation of Revenue [Line Items]        
Net sales 155.3 86.6 315.8 216.7
Operating Segments | International | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 118.9 65.6 240.6 167.1
Operating Segments | International | Other        
Disaggregation of Revenue [Line Items]        
Net sales 36.4 21.0 75.2 49.6
Operating Segments | International | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 114.6 60.9 230.5 158.6
Operating Segments | International | Direct        
Disaggregation of Revenue [Line Items]        
Net sales $ 40.7 $ 25.7 $ 85.3 $ 58.1