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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) channel facility | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jul. 11, 2018 | Jan. 01, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of products sales channels | channel |  | 2 |  |  |  |
Adjustments to additional paid in capital, income tax deficiency from share-based compensation |  | $ 1.1 | $ 0.7 |  |  |
Depreciation expense |  | 71.8 | 64.8 | $ 55.4 |  |
Sales returns accrual |  | 34.3 | 30.0 | 30.3 |  | $ 31.7
Allowance for doubtful accounts included in accounts receivable, net |  | 47.6 | 24.7 |  |  |
Shipping and handling included in cost of sales |  | 169.1 | 155.9 | 156.5 |  |
Advertising costs charged to expense |  | 259.3 | 283.5 | 352.3 |  |
Advertising costs deferred and included in prepaid expenses and other current assets |  | 8.5 | 3.8 |  |  |
Research and development costs charged to expense |  | 21.9 | 21.7 | 26.7 |  |
Self insurance reserve, excess loss coverage per claim per year |  | 0.8 |  |  |  |
Self insurance reserve, current |  | 5.2 | 4.8 |  |  |
Self insurance reserve, noncurrent |  | 16.3 | 15.9 |  |  |
Estimated insurance recoveries, current |  | 1.9 | 2.4 |  |  |
Estimated insurance recoveries, noncurrent |  | $ 6.0 | 7.6 |  |  |
Number of active plants | facility |  | 2 |  |  |  |
Number of previously closed US facilities | facility |  | 10 |  |  |  |
Customer termination charges, net |  | $ 0.0 | 14.4 | $ 0.0 |  |
Mattress Firm |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Restructuring charges | $ 25.9 |  |  |  |  |
Customer termination charges, net | 14.4 |  |  |  |  |
Accelerated compensation cost | 0.9 |  |  |  |  |
Mattress Firm | Write Off Incentives, Marketing Assets and Other |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Customer termination charges, net | 22.8 |  |  |  |  |
Mattress Firm | Cost of Sales |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Restructuring charges | 11.5 |  |  |  |  |
Mattress Firm | Cost of Sales | Write Off Inventory |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Restructuring charges | 5.4 |  |  |  |  |
Mattress Firm | Cost of Sales | Warranty Costs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Restructuring charges | 6.1 |  |  |  |  |
Mattress Firm | Other Income |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments for restructuring | 9.3 |  |  |  |  |
Performance-based Restricted Stock Units | Mattress Firm |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock compensation, forfeited benefit | $ 9.3 |  |  |  |  |
Mattresses | Non-prorated | International |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) |  | 5 years |  |  |  |
Mattresses | 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 |  | $ 22.0 | 19.6 |  |  |
Other non-current liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Sales returns accrual |  | 12.3 | 10.4 |  |  |
Standard product warranty accrual |  | 21.5 | 20.0 |  |  |
Accounts payable and accrued liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Standard product warranty accrual |  | $ 14.9 | $ 16.7 |  |  |
Maximum | Mattresses | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) |  | 25 years |  |  |  |
Maximum | Mattresses | International |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) |  | 15 years |  |  |  |
Maximum | Mattresses | Non-prorated | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) |  | 15 years |  |  |  |
Minimum | Mattresses | North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) |  | 10 years |  |  |  |
Minimum | Mattresses | International |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Warranty term (in years) |  | 5 years |  |  |  |
Minimum | Mattresses | 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% |  |  |  |

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