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Income Taxes (Details) kr in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 DKK (kr) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2018 DKK (kr) | Jun. 30, 2017 | Jun. 30, 2018 DKK (kr) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 DKK (kr)
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax provision (as a percent) |  | 28.90% | 37.60% | 29.70% | 29.70% | 34.00% |  |  |
Statutory U.S. federal income tax (as a percent) |  |  |  | 21.00% | 21.00% | 35.00% |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 29.2 |  | $ 29.2 |  |  |  | $ 31.7 |
Danish Tax Authority (SKAT) | Foreign Tax Authority |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Royalty rate (as a percent) |  |  |  | 20.00% | 20.00% |  |  |  |
Cumulative total tax assessment |  | 263.7 |  | $ 263.7 |  |  | kr 1,683.9 | 264.3 | kr 1,638.4
Unrecognized tax benefits |  | 134.8 |  | 134.8 |  |  | 860.5 | 137.9 | 854.7
Deferred tax assets |  | 49.0 |  | 49.0 |  |  |  | 48.3 |
Valuation allowance |  | 19.3 |  | 19.3 |  |  |  |  |
VAT taxes withheld by tax authority |  | 58.8 |  | 58.8 |  |  | 375.6 | 54.2 | 336.5
Deposit paid to SKAT | kr 615.2 |  |  | 96.3 |  |  |  |  |
VAT refund applied to income tax liability |  |  |  | 35.2 | kr 224.6 |  |  |  |
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2001-2011 |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  | 131.0 |  | 131.0 |  |  | 836.3 | 134.9 | 836.3
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years After 2011 |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  | $ 3.8 |  | $ 3.8 |  |  | kr 24.2 | $ 3.0 | kr 18.4

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