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Income Taxes (Details)
DKK in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Jul. 31, 2016
DKK
Sep. 30, 2017
DKK
Sep. 30, 2016
Sep. 30, 2017
DKK
Sep. 30, 2016
Sep. 30, 2017
USD ($)
Dec. 31, 2016
DKK
Dec. 31, 2016
USD ($)
Income Tax Examination [Line Items]                  
Effective income tax provision (as a percent)     33.00% 30.60% 33.60% 30.70%      
Statutory U.S. federal income tax (as a percent)     35.00% 35.00% 35.00% 35.00%      
Unrecognized tax benefits that would impact effective tax rate             $ 30.1   $ 21.4
Danish Tax Authority (SKAT) | Foreign Tax Authority                  
Income Tax Examination [Line Items]                  
Royalty rate (as a percent)         20.00%        
Cumulative total tax assessment     DKK 1,615.6   DKK 1,615.6   256.4 DKK 1,547.3 219.3
Unrecognized tax benefits     852.0   852.0   135.2 850.0 120.6
Deferred tax assets             44.3   43.5
Valuation allowance             17.6   17.6
VAT taxes withheld by tax authority     314.6   314.6   49.9 258.0 36.6
Deposit paid to SKAT $ 97.6 DKK 615.2              
VAT refund applied to income tax liability $ 35.6       224.6        
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2001-2011                  
Income Tax Examination [Line Items]                  
Unrecognized tax benefits     835.0   835.0   132.6 835.0 118.5
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years After 2011                  
Income Tax Examination [Line Items]                  
Unrecognized tax benefits     DKK 17.0   DKK 17.0   $ 2.6 DKK 15.0 $ 2.1