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Income Taxes - Additional Information (Details) DKK in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2015 DKK | Dec. 31, 2014 DKK | Dec. 31, 2013 USD ($)
Income Tax Examination [Line Items] |  |  |  |  |  |
Tax recognized on repatriation of earnings in connection with Sealy Acquisition |  |  | $ 48.1 |  |  |
Tax benefit recorded on repatriation of earnings |  | $ 63.9 |  |  |  |
Uncertain tax liability | $ 69.8 | 47.6 |  |  |  | $ 26.1
Valuation allowance | $ 24.2 | 21.7 |  |  |  |
Danish Tax Authority |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Royalty rate assessed on Danish earnings (percentage) | 20.00% |  |  |  |  |
Cumulative Assessment Amount Including Interest And Penalties | $ 199.6 | 215.1 |  | DKK 1,363.1 | DKK 1,317.2 |
Increase in tax liability due to the accrual of additional interest | DKK |  |  |  | DKK 45.9 |  |
VAT Taxes Withheld by Tax Authority | 26.0 | 15.0 |  |  |  |
Increase in uncertain tax liability | 60.7 |  |  |  |  |
Uncertain tax liability | 79.6 | $ 18.9 |  |  |  |
Valuation Allowance, Operating Loss Carryforwards | US State |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Valuation allowance | 87.0 |  |  |  |  |
Valuation Allowance, Tax Credit Carryforward | US State |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Valuation allowance | 3.6 |  |  |  |  |
Valuation Allowance, Tax Credit Carryforward | US Federal |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Valuation allowance | $ 7.8 |  |  |  |  |

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