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Income Taxes (Details)
DKK in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
DKK
Jun. 30, 2014
Jun. 30, 2015
DKK
Jun. 30, 2014
Jun. 30, 2015
USD ($)
Dec. 31, 2014
DKK
Dec. 31, 2014
USD ($)
Income Tax Examination [Line Items]              
Effective income tax provision (as a percent) 28.30% 132.40% 28.80% 45.70%      
Statutory U.S. federal income tax (as a percent) 35.00% 35.00%          
Uncertain tax benefits         $ 46.7   $ 47.6
Unrecognized tax benefits that would impact effective tax rate         43.9   44.6
Interest and penalties accrued         10.7   10.3
Danish tax authority              
Income Tax Examination [Line Items]              
Royalty Rate Assessed on Danish Earnings 9as a percent)     20.00%        
Cumulative Assessment Amount Including Interest And Penalties DKK 1,336.8   DKK 1,336.8   $ 198.8 DKK 1,317.2 $ 215.1
Increase in tax liability due to the accrual of additional interest | DKK DKK 19.6   DKK 19.6