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Income Taxes (Details) kr in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2016 DKK (kr) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 | Sep. 30, 2018 USD ($) | Sep. 30, 2018 DKK (kr) | Sep. 30, 2017 | Dec. 31, 2017 USD ($) | Sep. 30, 2018 DKK (kr) | Dec. 31, 2017 DKK (kr)
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax provision (as a percent) |  | 26.10% | 28.30% | 26.30% | 26.30% | 30.10% |  |  |
Statutory U.S. federal income tax (as a percent) |  |  |  | 21.00% | 21.00% | 35.00% |  |  |
Settlement |  | $ 46.3 |  | $ 46.3 |  |  |  |  |
Valuation allowance |  | 19.3 |  | 19.3 |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 84.5 |  | $ 84.5 |  |  | $ 31.7 |  |
Danish Tax Authority (SKAT) | Foreign Tax Authority |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Royalty rate (as a percent) |  |  |  | 20.00% | 20.00% |  |  |  |
Settlement |  | 130.0 |  | $ 130.0 |  |  | 134.8 | kr 835.0 | kr 835.0
Valuation allowance |  |  |  |  |  |  | 19.3 |  |
Unrecognized tax benefits |  |  |  |  |  |  | 137.8 |  | 854.7
Deferred Tax Assets, Net |  |  |  |  |  |  | 48.3 |  |
Deposit paid to SKAT | kr 615.2 |  |  | 95.8 |  |  | 98.9 |  |
VAT refund applied to income tax liability |  |  |  | 34.4 | kr 220.7 |  | 35.6 |  |
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2001-2011 |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Income Tax Examination, Accrued Tax and Interest |  | 34.4 |  | 34.4 |  |  |  | 221.0 |
Deferred tax assets |  | 8.4 |  | 8.4 |  |  |  |  |
Unrecognized tax benefits | kr |  |  |  |  |  |  |  |  | 836.3
VAT taxes withheld by tax authority |  | 61.1 |  | 61.1 |  |  | 54.1 | 392.6 | 336.5
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years After 2011 |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  | $ 3.2 |  | kr 19.7
VAT taxes withheld by tax authority |  | $ 26.8 |  | $ 26.8 |  |  |  | kr 171.9 |

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