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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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