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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 24, 2020 | Dec. 31, 2020 USD ($) channel facility | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 31, 2020 | Jan. 01, 2020 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of products sales channels | channel |  | 2 |  |  |  |  |  |
Stock split ratio | 4 |  |  |  |  |  |  |
Operating lease right-of-use assets |  | $ 304.3 | $ 245.4 |  |  |  |  |
Operating lease, liability |  | 336.1 |  |  |  |  |  |
Total stockholders' deficit |  | (504.6) | (360.4) | $ (217.5) |  |  |  | $ (112.5)
Depreciation expense |  | 80.5 | 73.8 | 71.8 |  |  |  |
Sales returns accrual |  | 44.9 | 39.3 | 34.3 |  |  |  |
Shipping and handling included in cost of sales |  | 223.1 | 192.2 | 169.1 |  |  |  |
Advertising costs charged to expense |  | 332.5 | 280.5 | 259.3 |  |  |  |
Advertising costs deferred and included in prepaid expenses and other current assets |  | 4.7 | 3.6 |  |  |  |  |
Research and development costs charged to expense |  | $ 23.1 | 23.0 | 21.9 |  |  |  |
Number of active plants | facility |  | 2 |  |  |  |  |  |
Number of previously closed US facilities | facility |  | 10 |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total stockholders' deficit |  | $ (2,045.6) | (1,703.3) | $ (1,513.8) |  |  |  | (1,416.2)
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  | $ 197.2 |
Operating lease, liability |  |  |  |  |  |  | $ 203.3 |
Total stockholders' deficit |  |  | 6.5 |  |  |  |  | 3.4
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total stockholders' deficit |  |  | 6.5 |  |  | $ 6.5 |  | $ 2.9
Sealy And Stems & Foster |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |  |
Bedding | Non-prorated | International Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 5 years |  |  |  |  |  |
Bedding | Prorated | International Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 10 years |  |  |  |  |  |
Pillows Two | Non-prorated |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 3 years |  |  |  |  |  |
Accrued liabilities and other current liabilities |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Sales returns accrual |  | $ 31.6 | 26.2 |  |  |  |  |
Other non-current liabilities |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Sales returns accrual |  | 13.3 | 13.1 |  |  |  |  |
Standard product warranty accrual |  | 23.9 | 22.2 |  |  |  |  |
Accounts payable and accrued liabilities |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Standard product warranty accrual |  | $ 20.3 | $ 19.4 |  |  |  |  |
Maximum | Bedding | North America Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 25 years |  |  |  |  |  |
Maximum | Bedding | International Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 15 years |  |  |  |  |  |
Maximum | Bedding | Non-prorated | North America Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 15 years |  |  |  |  |  |
Minimum | Bedding | North America Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 10 years |  |  |  |  |  |
Minimum | Bedding | International Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 5 years |  |  |  |  |  |
Minimum | Bedding | Non-prorated | North America Segment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Warranty term (in years) |  | 10 years |  |  |  |  |  |
Leasehold improvements | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 7 years |  |  |  |  |  |
Leasehold improvements | Minimum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 4 years |  |  |  |  |  |
Sealy Canada |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 100.00% |  |  |  |  |  |

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