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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) channel facility shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Oct. 03, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Number of products sales channels | channel |  |  | 2 |  |  |
Depreciation expense |  | $ 53.5 | $ 65.3 | $ 56.1 |  |
Allowance for doubtful accounts included in accounts receivable, net |  |  | 27.4 | 22.4 |  |
Shipping and handling included in net sales |  | 11.1 | 11.3 | 11.7 |  |
Shipping and handling included in cost of sales |  | 161.6 | 159.3 | 155.1 |  |
Advertising costs charged to expense |  | 360.5 | 284.1 | 352.7 |  |
Advertising costs deferred and included in prepaid expenses and other current assets |  |  | 3.8 | 7.4 |  |
Research and development costs charged to expense |  | $ 28.7 | 21.7 | 26.7 |  |
Royalty revenue, net of royalty expense |  |  | 20.8 | 19.5 | $ 18.3 |
Treasury stock repurchased |  |  | 40.1 | 533.0 | 1.3 |
Self insurance reserve, excess loss coverage per claim per year |  |  | 0.8 |  |  |
Self insurance reserve, current |  |  | 4.8 | 8.6 |  |
Self insurance reserve, noncurrent |  |  | 15.9 | 12.3 |  |
Estimated insurance recoveries, current |  |  | 2.4 | 0.0 |  |
Estimated insurance recoveries, noncurrent |  |  | $ 7.6 | 14.2 |  |
Number of active plants | facility |  |  | 2 |  |  |
Number of previously closed US facilities | facility |  |  | 10 |  |  |
Restructuring expenses |  |  |  | 8.3 |  |
Customer termination charges, net |  |  | $ 14.4 | 0.0 | $ 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 |  |  |  |  |
February 2016 Program |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Treasury stock repurchased (in shares) | shares |  |  | 600,000 |  |  |
Treasury stock repurchased |  |  | $ 4.8 | $ 2.0 |  |
Stock repurchase program, amount remaining under share repurchase authorization (in shares) | shares |  |  | 226,900,000 |  |  |
Performance-based Restricted Stock Units |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares paid for tax withholding for share based compensation(in shares) | shares |  |  | 100,000.0 | 0 |  |
Performance-based Restricted Stock Units | Mattress Firm |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock compensation, forfeited benefit | $ 9.3 |  |  |  |  |
North America |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  |  |  | 51.00% |  | 51.00%
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 |  |  |
Accounts Payable and Accrued Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Standard product warranty accrual |  |  | $ 16.7 | $ 14.3 |  |
Other Noncurrent Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Standard product warranty accrual |  |  | $ 20.0 | $ 15.6 |  |
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 |  |  |
Comfort Revolution |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of noncontrolling interest from the acquisition |  |  | 55.00% |  |  |
Comfort Revolution | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 45.00% |  |  |
Sealy Canada |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  |  | 100.00% |  |  |

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