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Income Taxes (Details)
DKK in Millions, $ in Millions
1 Months Ended 3 Months Ended
Jul. 31, 2016
DKK
Jul. 31, 2016
USD ($)
Mar. 31, 2017
DKK
Mar. 31, 2016
Mar. 31, 2017
USD ($)
Dec. 31, 2016
DKK
Dec. 31, 2016
USD ($)
Income Tax Examination [Line Items]              
Effective income tax provision (as a percent)     31.30% 30.70%      
Statutory U.S. federal income tax (as a percent)     35.00% 35.00%      
Deposit paid to SKAT DKK 615.2 $ 88.8          
Unrecognized tax benefits that would impact effective tax rate         $ 21.8   $ 21.4
Danish tax authority              
Income Tax Examination [Line Items]              
Royalty rate (as a percent)     20.00%        
Cumulative total tax assessment     DKK 1,570.1   225.5 DKK 1,547.3 219.3
Unrecognized tax benefits     852.0   122.7 850.0 120.6
Deferred tax assets         44.3   43.5
Valuation allowance         17.6   17.6
VAT Taxes Withheld by Tax Authority     276.3   39.9 258.0 36.6
VAT refund applied to income tax liability DKK 224.6 $ 32.4          
Tax Years 2001-2011 | Danish tax authority              
Income Tax Examination [Line Items]              
Unrecognized tax benefits     835.0   120.5 835.0 118.5
Tax Years After 2011 | Danish tax authority              
Income Tax Examination [Line Items]              
Unrecognized tax benefits     DKK 17.0   $ 2.5 DKK 15.0 $ 2.1