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Income Taxes - Additional Information (Details) kr in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 DKK (kr) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 DKK (kr) | Dec. 31, 2017 DKK (kr)
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ (23.8) |  |  |  |  |  |
Remeasurement of deferred taxes |  |  | $ 0.0 |  | $ (69.7) | $ 0.0 |  |
Transition Tax |  |  | 6.8 |  | (45.9) | 0.0 |  |
Unrecognized tax benefits |  | 31.7 | 91.4 |  | 31.7 | 21.4 |  |
Income tax penalties and interest expense |  |  | 6.4 |  | 0.4 | 1.6 |  |
Accrued interest and penalties |  | 59.9 | 66.3 |  | 59.9 | 52.3 |  |
Uncertain tax liability |  | 84.5 | 103.8 |  | 84.5 | $ 71.7 |  |
Valuation allowance |  | 55.1 | 43.1 |  | 55.1 |  |  |
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% | 20.00% |  |  |  |
Danish Tax Authority (SKAT) [Member] | Danish Tax Authority |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Deferred tax assets, net |  | 48.3 |  |  | 48.3 |  |  |
Valuation allowance |  | 19.3 |  |  | 19.3 |  |  |
Tax deposit paid | $ 615.2 |  | $ 94.4 |  | 98.9 |  |  |
VAT refund applied to income tax liability | $ 232.1 |  | 35.6 |  | 37.4 |  |  |
Danish Tax Authority (SKAT) [Member] | Tax Years 2001-2011 | Danish Tax Authority |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Uncertain tax liability |  | 137.8 | 72.2 |  | 137.8 |  | kr 470.5 | kr 854.7
Interest expense |  |  | 57.8 | kr 376.8 |  |  |  |
Tax and interest expense |  |  | 130.0 | 847.3 |  |  |  |
VAT taxes withheld by tax authority |  | 134.8 |  |  | 134.8 |  |  | 835.0
Uncertain tax liability, difference |  |  | 19.2 |  |  |  | 125.0 |
Danish Tax Authority (SKAT) [Member] | Tax Years 2012 - 2018 | Danish Tax Authority |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Uncertain tax liability |  |  | 35.3 |  |  |  | 230.2 |
Tax and interest expense |  |  | 32.1 | kr 210.6 |  |  |  |
Deferred tax assets, net |  |  | 4.2 |  |  |  |  |
VAT taxes withheld by tax authority |  | 54.1 | $ 53.3 |  | 54.1 |  | kr 347.1 | 336.5
Danish Tax Authority (SKAT) [Member] | Tax Years 2012 - 2017 | Danish Tax Authority |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Uncertain tax liability |  | $ 3.2 |  |  | $ 3.2 |  |  | kr 19.7

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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