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, 2019 USD ($)	Dec. 31, 2019 DKK (kr)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 DKK (kr)	Dec. 31, 2018 DKK (kr)
Income Tax Examination [Line Items]
Income tax expense (benefit)		$ (23.8)
Remeasurement of deferred taxes			$ 0.0		$ 0.0	$ (69.7)
Transition Tax			0.0		6.8	(45.9)
Unrecognized tax benefits		31.7	96.8		91.4	31.7
Income tax penalties and interest expense			1.3		6.4	0.4
Accrued interest and penalties		59.9	67.9		66.3	59.9
Uncertain tax liability		$ 84.5	104.5		103.8	$ 84.5
Valuation allowance			30.0		43.1
US State
Income Tax Examination [Line Items]
Operating loss carryforwards, valuation allowance			89.5
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	$ 615.2		92.3		94.4
VAT refund applied to income tax liability	$ 232.1		34.8		35.6
Danish Tax Authority (SKAT) | Tax Years 2001-2011 | Danish Tax Authority
Income Tax Examination [Line Items]
Tax and interest expense			127.2	kr 847.3	130.0
Income Tax Examination, Accrued Tax and Interest			145.6		147.7		kr 970.1	kr 962.3
Uncertain tax liability, difference			18.8				125.0
Danish Tax Authority (SKAT) | Tax Years 2012 - 2018 | Danish Tax Authority
Income Tax Examination [Line Items]
Uncertain tax liability			39.5		35.3		263.3	kr 230.3
Deferred tax assets, net			7.2		4.2
VAT taxes withheld by tax authority			$ 52.1		$ 53.3		kr 347.1