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Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) channel | Sep. 30, 2017 USD ($) | Oct. 31, 2018 USD ($) | 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 | $ 18.7 |  |  | $ 18.7 |  |  |  | $ 21.5
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |
Allowance for doubtful accounts included in accounts receivable, net | 31.9 |  |  | 31.9 |  |  |  | 24.7
Tax benefit recognized |  |  |  |  | $ 9.3 |  |  |
Revenues | 729.5 | $ 711.5 |  | 2,026.8 | $ 2,069.2 |  |  |
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 | 23.4 |  |  | 23.4 |  |  |  | 19.6
Warranty Term [Abstract] |  |  |  |  |  |  |  |
Accrued warranty expense | 15.1 |  |  | 15.1 |  |  |  | 16.7
Other noncurrent liabilities |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |
Accrued sales returns | 12.4 |  |  | 12.4 |  |  |  | 10.4
Warranty Term [Abstract] |  |  |  |  |  |  |  |
Accrued warranty expense | $ 21.6 |  |  | $ 21.6 |  |  |  | $ 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% |  |  |  |
Equity method investment, remaining ownership percentage |  |  |  |  |  |  | 55.00% |
Subsequent Event | Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 50.0 |  |
Fixed interest rate |  |  |  |  |  | 2.0575% |  |
2026 Senior Notes | Subsequent Event |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  | 5.50% |  |

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