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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 |  |  |  |  |  |  |

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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
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