Cumulative Assessment Amount Including Interest And Penalties

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Income Tax Examination, Tax Deposit, Amount Paid

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Income Tax Examination, VAT Refund Applied to Income Tax Liability

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Income Tax Examination, VAT Taxes Withheld by Tax Authority

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Royalty Rate Assessed on Foreign Earnings

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Details) kr in Millions, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
Income Taxes (Details) kr in Millions, $ in Millions	Jul. 31, 2016 DKK (kr)	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Jun. 30, 2018 USD ($)	Jun. 30, 2018 DKK (kr)	Jun. 30, 2017	Jun. 30, 2018 DKK (kr)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 DKK (kr)
Income Tax Examination [Line Items]
Effective income tax provision (as a percent)		28.90%	37.60%	29.70%	29.70%	34.00%
Statutory U.S. federal income tax (as a percent)				21.00%	21.00%	35.00%
Unrecognized tax benefits that would impact effective tax rate		$ 29.2		$ 29.2				$ 31.7
Danish Tax Authority (SKAT) \| Foreign Tax Authority
Income Tax Examination [Line Items]
Royalty rate (as a percent)				20.00%	20.00%
Cumulative total tax assessment		263.7		$ 263.7			kr 1,683.9	264.3	kr 1,638.4
Unrecognized tax benefits		134.8		134.8			860.5	137.9	854.7
Deferred tax assets		49.0		49.0				48.3
Valuation allowance		19.3		19.3
VAT taxes withheld by tax authority		58.8		58.8			375.6	54.2	336.5
Deposit paid to SKAT	kr 615.2			96.3
VAT refund applied to income tax liability				35.2	kr 224.6
Danish Tax Authority (SKAT) \| Foreign Tax Authority \| Tax Years 2001-2011
Income Tax Examination [Line Items]
Unrecognized tax benefits		131.0		131.0			836.3	134.9	836.3
Danish Tax Authority (SKAT) \| Foreign Tax Authority \| Tax Years After 2011
Income Tax Examination [Line Items]
Unrecognized tax benefits		$ 3.8		$ 3.8			kr 24.2	$ 3.0	kr 18.4