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Income Taxes (Details) kr in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended			12 Months Ended
	Jul. 31, 2016 DKK (kr)	Sep. 30, 2018 USD ($)	Sep. 30, 2017	Sep. 30, 2018 USD ($)	Sep. 30, 2018 DKK (kr)	Sep. 30, 2017	Dec. 31, 2017 USD ($)	Sep. 30, 2018 DKK (kr)	Dec. 31, 2017 DKK (kr)
Income Tax Examination [Line Items]
Effective income tax provision (as a percent)		26.10%	28.30%	26.30%	26.30%	30.10%
Statutory U.S. federal income tax (as a percent)				21.00%	21.00%	35.00%
Settlement		$ 46.3		$ 46.3
Valuation allowance		19.3		19.3
Unrecognized tax benefits that would impact effective tax rate		84.5		$ 84.5			$ 31.7
Danish Tax Authority (SKAT) | Foreign Tax Authority
Income Tax Examination [Line Items]
Royalty rate (as a percent)				20.00%	20.00%
Settlement		130.0		$ 130.0			134.8	kr 835.0	kr 835.0
Valuation allowance							19.3
Unrecognized tax benefits							137.8		854.7
Deferred Tax Assets, Net							48.3
Deposit paid to SKAT	kr 615.2			95.8			98.9
VAT refund applied to income tax liability				34.4	kr 220.7		35.6
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2001-2011
Income Tax Examination [Line Items]
Income Tax Examination, Accrued Tax and Interest		34.4		34.4				221.0
Deferred tax assets		8.4		8.4
Unrecognized tax benefits | kr									836.3
VAT taxes withheld by tax authority		61.1		61.1			54.1	392.6	336.5
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years After 2011
Income Tax Examination [Line Items]
Unrecognized tax benefits							$ 3.2		kr 19.7
VAT taxes withheld by tax authority		$ 26.8		$ 26.8				kr 171.9

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