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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) channel facility | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Jul. 11, 2018 | Jan. 01, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of products sales channels | channel | 2 |  |  |  |  |
Operating lease right-of-use assets | $ 245.4 | $ 0.0 |  |  |  |
Operating lease, liability | 256.2 |  |  |  |  |
Depreciation expense | 73.8 | 71.8 | $ 64.8 |  |  |
Sales returns accrual | 39.3 | 34.3 | 30.0 |  |  | $ 31.7
Allowance for doubtful accounts included in accounts receivable, net | 71.9 | 47.6 |  |  |  |
Shipping and handling included in cost of sales | 192.5 | 169.1 | 155.9 |  |  |
Advertising costs charged to expense | 280.5 | 259.3 | 283.5 |  |  |
Advertising costs deferred and included in prepaid expenses and other current assets | 3.6 | 8.5 |  |  |  |
Research and development costs charged to expense | $ 23.0 | 21.9 | $ 21.7 |  |  |
Number of active plants | facility | 2 |  |  |  |  |
Number of previously closed US facilities | facility | 10 |  |  |  |  |
Bedding | Non-prorated | International |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) | 5 years |  |  |  |  |
Bedding | Prorated | International |  |  |  |  |  |
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 | $ 26.2 | 22.0 |  |  |  |
Other non-current liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Sales returns accrual | 13.1 | 12.3 |  |  |  |
Standard product warranty accrual | 22.2 | 21.5 |  |  |  |
Accounts payable and accrued liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Standard product warranty accrual | $ 19.4 | $ 14.9 |  |  |  |
Maximum | Bedding | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) | 25 years |  |  |  |  |
Maximum | Bedding | International |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) | 15 years |  |  |  |  |
Maximum | Bedding | Non-prorated | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) | 15 years |  |  |  |  |
Minimum | Bedding | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) | 10 years |  |  |  |  |
Minimum | Bedding | International |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) | 5 years |  |  |  |  |
Minimum | Bedding | Non-prorated | North America |  |  |  |  |  |
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 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, acquired remaining interest, percentage |  |  |  |  | 55.00% |
Sealy Canada |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage by parent | 100.00% |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 197.2 |  |
Operating lease, liability |  |  |  | $ 203.3 |  |

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