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Summary of Significant Accounting Policies (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
channel
Mar. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
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 $ 24.8     $ 22.5      
Total Stockholders' Equity $ (249.7) $ (208.4)   (360.4) $ (305.9) $ (253.5) $ (217.5)
Warranty Term [Abstract]              
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member            
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 $ (1,779.5) $ (1,756.5)   (1,703.3) $ (1,583.8) $ (1,542.2) $ (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 27.9     26.2      
Warranty Term [Abstract]              
Accrued warranty expense 17.5     19.4      
Other noncurrent liabilities              
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Accrued sales returns 13.4     13.1      
Warranty Term [Abstract]              
Accrued warranty expense $ 22.9     $ 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