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Net Sales - Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Net sales $ 1,358.3 $ 1,132.3 $ 3,571.2 $ 2,619.9
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 1,358.3 1,132.3 3,571.2 2,619.9
Operating Segments | United States        
Disaggregation of Revenue [Line Items]        
Net sales 1,018.8 904.3 2,783.6 2,078.8
Operating Segments | All Other        
Disaggregation of Revenue [Line Items]        
Net sales 339.5 228.0 787.6 541.1
Operating Segments | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 1,244.5 1,035.2 3,277.9 2,397.5
Operating Segments | Other        
Disaggregation of Revenue [Line Items]        
Net sales 113.8 97.1 293.3 222.4
Operating Segments | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 1,099.2 987.2 2,986.0 2,273.3
Operating Segments | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 259.1 145.1 585.2 346.6
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Net sales 1,120.0 994.7 3,017.1 2,265.6
Operating Segments | North America | United States        
Disaggregation of Revenue [Line Items]        
Net sales 1,018.8 904.3    
Operating Segments | North America | All Other        
Disaggregation of Revenue [Line Items]        
Net sales 101.2 90.4 233.5 186.8
Operating Segments | North America | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 1,047.1 929.2 2,839.9 2,124.4
Operating Segments | North America | Other        
Disaggregation of Revenue [Line Items]        
Net sales 72.9 65.5 177.2 141.2
Operating Segments | North America | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 991.2 887.1 2,647.5 2,014.6
Operating Segments | North America | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 128.8 107.6 369.6 251.0
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 238.3 137.6 554.1 354.3
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 238.3 137.6 554.1 354.3
Operating Segments | International | Bedding        
Disaggregation of Revenue [Line Items]        
Net sales 197.4 106.0 438.0 273.1
Operating Segments | International | Other        
Disaggregation of Revenue [Line Items]        
Net sales 40.9 31.6 116.1 81.2
Operating Segments | International | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 108.0 100.1 338.5 258.7
Operating Segments | International | Direct        
Disaggregation of Revenue [Line Items]        
Net sales $ 130.3 $ 37.5 $ 215.6 $ 95.6