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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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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.

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