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Summary of Significant Accounting Policies - Inventory, warranty and other (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Inventory [Abstract] |  |  |  |  |
Finished goods | $ 132.3 |  | $ 132.3 |  | $ 134.0
Work-in-process | 11.7 |  | 11.7 |  | 11.4
Raw materials and supplies | 69.1 |  | 69.1 |  | 71.8
Total | 213.1 |  | 213.1 |  | 217.2
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Accrued expenses | 16.0 |  | 16.0 |  | 16.1
Other non-current liabilities | 15.4 |  | 15.4 |  | 15.2
Revenue Recognition [Abstract] |  |  |  |  |
Allowance for doubtful accounts included in accounts receivable, net | 22.0 |  | 22.0 |  | $ 19.5
Redemption value adjustment | 0.2 |  | $ 1.1 |  |
North America | Pillows |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 3 years |  |
Non-prorated | International | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 5 years |  |
Prorated | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 10 years |  |
Minimum | North America | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 10 years |  |
Minimum | International | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 5 years |  |
Minimum | Non-prorated | North America | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 10 years |  |
Maximum | North America | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 25 years |  |
Maximum | International | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 15 years |  |
Maximum | Non-prorated | North America | Mattresses |  |  |  |  |
Warranty Term [Abstract] |  |  |  |  |
Warranty term (in years) |  |  | 15 years |  |
Sales Returns |  |  |  |  |
Sales returns [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 32.3 |  |
Amounts accrued |  |  | 87.7 |  |
Warranties charged to accrual |  |  | (89.5) |  |
Ending balance | 30.5 |  | 30.5 |  |
Warranty Reserves |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 31.3 |  |
Amounts accrued |  |  | 22.5 |  |
Warranties charged to accrual |  |  | (22.4) |  |
Ending balance | $ 31.4 |  | $ 31.4 |  |
Comfort Revolution |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |
Equity method investment, ownership percentage | 55.00% |  | 55.00% |  |
Redemption Value as Multiplier of Earnings before Interest Taxes, Depreciation and Amortization | 7.5 |  | 7.5 |  |
Period of EBITDA considered for redemption value (in months) |  |  | 12 months |  |
Income attributable to Comfort Revolution, LLC | $ 0.5 | $ 0.4 | $ 1.0 | $ 0.5 |
Other Income |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |
Other income from partial litigation settlement |  |  | 9.5 |  |
Employee Severances and Facility Closures |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |
Restructuring expenses | 2.4 |  |  |  |
Expected restructuring charges | $ 8.0 |  | $ 8.0 |  |

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