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Summary of Significant Accounting Policies (Details) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) channel | Jan. 01, 2019 USD ($) | 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 | $ 17.3 |  | $ 22.5
Operating lease right-of-use assets | 227.2 |  |
Present value of lease obligations | 235.9 |  |
Revenue from Contract with Customer [Abstract] |  |  |
Allowance for doubtful accounts included in accounts receivable, net | 48.9 |  | 47.6
Accrued expenses and other current liabilities |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Accrued sales returns | 27.2 |  | 22.0
Warranty Term [Abstract] |  |  |
Accrued warranty expense | 19.0 |  | 14.9
Other noncurrent liabilities |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Accrued sales returns | 12.6 |  | 12.3
Warranty Term [Abstract] |  |  |
Accrued warranty expense | $ 22.2 |  | $ 21.5
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 |  |
Accounting Standards Update 2016-02 |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Operating lease right-of-use assets |  | $ 197.2 |
Present value of lease obligations |  | $ 203.3 |

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