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Summary of Significant Accounting Policies (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
channel
Dec. 31, 2019
USD ($)
Oct. 31, 2020
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Number of products sales channels | channel 2              
Ownership percentage 50.00%              
Net investment $ 16.0 $ 22.5            
Total Stockholders' Equity $ (447.3) $ (360.4)   $ (241.0)   $ (336.5) $ (305.9) $ (217.5)
Warranty Term [Abstract]                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member            
Subsequent Event | Sealy and Stems & Foster                
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Ownership percentage     50.00%          
Cumulative Effect, Period Of Adoption, Adjustment                
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Total Stockholders' Equity   $ 6.5            
Retained Earnings                
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Total Stockholders' Equity $ (1,900.9) (1,703.3)   $ (1,779.5)   $ (1,657.1) $ (1,583.8) $ (1,513.8)
Retained Earnings | Cumulative Effect, Period Of Adoption, Adjustment                
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Total Stockholders' Equity   6.5     $ 6.5      
Accrued expenses and other current liabilities                
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Accrued sales returns 29.0 26.2            
Warranty Term [Abstract]                
Accrued warranty expense 18.8 19.4            
Other noncurrent liabilities                
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]                
Accrued sales returns 13.1 13.1            
Warranty Term [Abstract]                
Accrued warranty expense $ 23.0 $ 22.2            
Mattresses | Non-prorated | International                
Warranty Term [Abstract]                
Warranty term (in years) 5 years              
Mattresses | Prorated | International                
Warranty Term [Abstract]                
Warranty term (in years) 10 years              
Mattresses | Minimum | North America                
Warranty Term [Abstract]                
Warranty term (in years) 10 years              
Mattresses | Minimum | International                
Warranty Term [Abstract]                
Warranty term (in years) 5 years              
Mattresses | Minimum | Non-prorated | North America                
Warranty Term [Abstract]                
Warranty term (in years) 10 years              
Mattresses | Maximum | North America                
Warranty Term [Abstract]                
Warranty term (in years) 25 years              
Mattresses | Maximum | International                
Warranty Term [Abstract]                
Warranty term (in years) 15 years              
Mattresses | Maximum | Non-prorated | North America                
Warranty Term [Abstract]                
Warranty term (in years) 15 years              
Pillows | North America                
Warranty Term [Abstract]                
Warranty term (in years) 3 years