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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
channel
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
Business Acquisition [Line Items]        
Number of products sales channels | channel 2      
Depreciation expense $ 111.4 $ 94.7 $ 80.5  
Sales returns accrual 40.5 49.8 44.9  
Shipping and handling included in cost of sales 330.3 294.8 223.1  
Advertising costs charged to expense 448.0 432.8 332.5  
Advertising costs deferred and included in prepaid expenses and other current assets 12.4 9.0    
Research and development costs charged to expense 29.2 27.3 $ 23.1  
Defined benefit plan, benefit obligation 30.1 42.1    
Defined benefit plan, amount $ 25.8 34.3    
2029 Senior Notes | Redemption period three | Senior Notes        
Business Acquisition [Line Items]        
Percentage of redemption on notes 100.00%      
Joint Ventures        
Business Acquisition [Line Items]        
Ownership percentage 50.00%      
United Kingdom Joint Venture        
Business Acquisition [Line Items]        
Ownership percentage 50.00%     50.00%
Bedding | Non-prorated | International Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 5 years      
Bedding | Prorated | International Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 10 years      
Pillows Two | Non-prorated        
Business Acquisition [Line Items]        
Warranty term (in years) 3 years      
Accrued liabilities and other current liabilities        
Business Acquisition [Line Items]        
Sales returns accrual $ 27.5 33.7    
Other non-current liabilities        
Business Acquisition [Line Items]        
Sales returns accrual 13.0 16.1    
Standard product warranty accrual 23.8 23.7    
Accounts payable and accrued liabilities        
Business Acquisition [Line Items]        
Standard product warranty accrual $ 17.8 $ 20.2    
Minimum | Bedding | North America Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 10 years      
Minimum | Bedding | International Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 5 years      
Minimum | Bedding | Non-prorated | North America Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 10 years      
Maximum | Bedding | North America Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 25 years      
Maximum | Bedding | International Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 15 years      
Maximum | Bedding | Non-prorated | North America Segment        
Business Acquisition [Line Items]        
Warranty term (in years) 15 years