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Income Taxes (Details)
DKK in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2016
DKK
Jul. 31, 2016
USD ($)
Jun. 30, 2017
DKK
Jun. 30, 2016
Jun. 30, 2017
DKK
Jun. 30, 2017
USD ($)
Jun. 30, 2016
Jun. 30, 2017
USD ($)
Dec. 31, 2016
DKK
Dec. 31, 2016
USD ($)
Income Tax Examination [Line Items]                    
Effective income tax provision (as a percent)     37.60% 31.50% 34.00% 34.00% 31.00%      
Statutory U.S. federal income tax (as a percent)     35.00% 35.00% 35.00% 35.00% 35.00%      
Deposit paid to SKAT DKK 615.2 $ 94.4                
Unrecognized tax benefits that would impact effective tax rate               $ 27.5   $ 21.4
Danish tax authority                    
Income Tax Examination [Line Items]                    
Royalty rate (as a percent)         20.00% 20.00%        
Cumulative total tax assessment     DKK 1,592.8   DKK 1,592.8     244.4 DKK 1,547.3 219.3
Unrecognized tax benefits     852.0   852.0     131.0 850.0 120.6
Deferred tax assets               44.3   43.5
Valuation allowance               17.6   17.6
VAT taxes withheld by tax authority     296.7   296.7     45.5 258.0 36.6
VAT refund applied to income tax liability         224.6 $ 34.5        
Danish tax authority | Tax Years 2001-2011                    
Income Tax Examination [Line Items]                    
Unrecognized tax benefits     835.0   835.0     128.5 835.0 118.5
Danish tax authority | Tax Years After 2011                    
Income Tax Examination [Line Items]                    
Unrecognized tax benefits     DKK 17.0   DKK 17.0     $ 2.5 DKK 15.0 $ 2.1