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Summary of Significant Accounting Policies (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
channel
Jun. 30, 2017
USD ($)
Jul. 11, 2018
Dec. 31, 2017
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Number of products sales channels | channel       2      
Ownership percentage 50.00%     50.00%      
Net investment $ 24.3     $ 24.3     $ 21.5
Revenue Recognition [Abstract]              
Allowance for doubtful accounts included in accounts receivable, net 26.4     26.4     27.4
Tax benefit recognized         $ 9.3    
Revenues 669.7 $ 659.3   1,317.7 $ 1,381.4    
Mattress Firm              
Revenue Recognition [Abstract]              
Restructuring charges     $ 25.9        
Tax benefit recognized     9.3        
Revenues     9.3        
Mattress Firm | Cost of Sales              
Revenue Recognition [Abstract]              
Restructuring charges     11.5        
Write-off of inventory     5.4        
Warranty costs     6.1        
Mattress Firm | Customer Termination Charges, Net              
Revenue Recognition [Abstract]              
Restructuring charges     14.4        
Write off of incentives and marketing assets, employee-related costs, and professional fees     22.8        
Accelerated amortization     $ 0.9        
Accrued expenses and other current liabilities              
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Accrued sales returns 22.4     22.4     19.6
Warranty Term [Abstract]              
Accrued warranty expense 16.0     16.0     16.7
Other noncurrent liabilities              
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Accrued sales returns 12.5     12.5     10.4
Warranty Term [Abstract]              
Accrued warranty expense $ 21.2     $ 21.2     $ 20.0
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      
Comfort Revolution              
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Equity method investment, ownership percentage       45.00%      
Subsequent Event | Comfort Revolution              
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Equity method investment, remaining ownership percentage           55.00%