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Income Taxes (Details)
DKK in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
Dec. 31, 2015
USD ($)
Mar. 31, 2016
DKK
Dec. 31, 2015
DKK
Dec. 31, 2014
USD ($)
Income Tax Examination [Line Items]            
Effective income tax provision (as a percent) 30.70% 29.20%        
Statutory U.S. federal income tax (as a percent) 35.00% 35.00%        
Increase in uncertain tax liability     $ 59.7      
Uncertain tax liability $ 78.6   78.6     $ 18.9
Unrecognized tax benefits that would impact effective tax rate $ 67.9   67.7      
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 $ 224.4   199.6 DKK 1,479.0 DKK 1,363.1  
VAT Taxes Withheld by Tax Authority $ 30.0   $ 26.0