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Income Taxes - Additional Information (Details) DKK in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 DKK | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 DKK | Dec. 31, 2016 DKK
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Remeasurement of deferred taxes |  | $ 0.0 | $ (69.7) | $ 0.0 |  |  |
Tax reform tax rate change (percentage) |  | (0.00%) | 37.00% | (0.00%) |  |  |
Effective income tax provision (percentage) |  |  | 25.70% | 39.00% |  |  |
Transition Tax |  | $ 0.0 | $ 45.9 | $ 0.0 |  |  |
Transition Tax (percentage) |  | 0.00% | 24.40% | 0.00% |  |  |
Unrecognized tax benefits |  | $ 67.7 |  | $ 21.4 | $ 67.7 |  |
Income tax penalties and interest expense |  |  | $ 0.4 | 1.6 | 33.5 |  |
Accrued interest and penalties |  | 43.8 | 59.9 | 52.3 | 43.8 |  |
Uncertain tax liability |  | $ 69.8 | 84.5 | 71.7 | $ 69.8 |  |
Deferred income taxes |  |  | 107.1 | 142.4 |  |  |
Valuation allowance |  |  | 55.1 | 45.2 |  |  |
Tax deposit paid | DKK 615.2 |  | 98.9 | 87.2 |  |  |
US State |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards, valuation allowance |  |  | 124.2 |  |  |  |
Tax credit carryforward, valuation allowance |  |  | 8.1 |  |  |  |
US Federal |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax credit carryforward, valuation allowance |  |  | $ 12.2 |  |  |  |
Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Royalty rate assessed on Danish earnings (percentage) |  |  | 20.00% |  |  |  |
Cumulative assessment amount including interest and penalties |  |  | $ 264.3 | 219.3 |  | DKK 1,638.4 | DKK 1,547.3
Uncertain tax liability |  |  | 137.8 | 120.6 |  | 854.0 | 850.0
Deferred income taxes |  |  | 47.2 | 43.5 |  |  |
Valuation allowance |  |  | 19.3 | 17.6 |  |  |
VAT taxes withheld by tax authority |  |  | 54.1 | 36.6 |  | 336.5 | 258.0
VAT refund applied to income tax liability | DKK 224.6 |  | 36.1 | 31.8 |  |  |
Tax Years 2001-2011 | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Uncertain tax liability |  |  | 134.8 | 118.5 |  | 835.0 |
Tax Years After 2011 | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Uncertain tax liability |  |  | $ 3.0 | $ 2.1 |  | DKK 18.0 | DKK 15.0

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