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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 DKK (kr) | Sep. 30, 2020 DKK (kr) | Mar. 31, 2020 DKK (kr) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 DKK (kr)
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | $ 106.0 | $ 96.8 | $ 91.4 |
Income tax penalties and interest expense |  |  |  | 1.0 | 1.3 | 6.4 |
Accrued interest and penalties |  |  |  | 74.9 | 67.9 | $ 66.3 |
US State |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards, valuation allowance |  |  |  | 88.1 |  |  |
Tax credit carryforward, valuation allowance |  |  |  | 1.4 |  |  |
US Federal |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax credit carryforward, valuation allowance |  |  |  | 12.2 |  |  |
Danish Tax Authority (SKAT) | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax deposit paid | kr | kr 615.2 |  |  |  |  |  |
Danish Tax Authority (SKAT) | Tax Years After 2011 | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Deferred tax assets, net |  |  |  | 12.0 | 7.2 |  |
Danish Tax Authority (SKAT) | Tax Year 2014 | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax deposit paid | kr |  | kr 76.8 |  |  |  |  |
Danish Tax Authority (SKAT) | Tax Years 2012 - 2013 | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Tax deposit paid | kr |  |  | kr 134.0 |  |  |  |
Danish Tax Authority (SKAT) | Tax Years 2001-2011 | Danish Tax Authority |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Uncertain tax liability, difference |  |  |  | $ 20.5 | $ 18.8 |  | kr 125.0

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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://www.xbrl.org/2009/role/commonPracticeRef -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 The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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