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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
channel
plant
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Number of products sales channels | channel 2    
Depreciation expense $ 156.9 $ 125.1 $ 111.4
Sales returns accrual 44.2 43.7 40.5
Shipping and handling included in cost of sales 306.5 322.2 330.3
Advertising expense 470.9 469.0 448.0
Advertising costs deferred and included in prepaid expenses and other current assets 10.0 10.2  
Research and development expense $ 30.8 30.6 $ 29.2
Number of active plants with defined benefit plans | plant 2    
Number of closed plants with defined benefit plans | plant 10    
Number of plants with defined benefit plans for hourly employees | plant 1    
Defined benefit plan, benefit obligation $ 31.0 32.6  
Defined benefit plan, amount $ 29.4 27.9  
2029 Senior Notes | Redemption period three | Senior Notes      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Percentage of redemption on notes 100.00%    
Bedding | Non-prorated | International      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 5 years    
Bedding | Prorated | International      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 10 years    
Pillows Two | Non-prorated      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 3 years    
Accrued Liabilities and Other Current Liabilities      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Sales returns accrual $ 30.3 30.4  
Other Noncurrent Liabilities      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Sales returns accrual 13.9 13.3  
Standard product warranty accrual 18.3 21.9  
Accrued Expenses and Other Current Liabilities      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Standard product warranty accrual $ 15.3 $ 18.9  
Minimum | Bedding | North America      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 10 years    
Minimum | Bedding | International      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 5 years    
Minimum | Bedding | Non-prorated | North America      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 10 years    
Maximum | Bedding | North America      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 25 years    
Maximum | Bedding | International      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 15 years    
Maximum | Bedding | Non-prorated | North America      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Warranty term (in years) 15 years    
Asia Pacific Joint Ventures      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Ownership percentage 50.00%    
United Kingdom Joint Venture      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Ownership percentage 50.00%