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Income Taxes (Details)
DKK in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
Jun. 30, 2016
USD ($)
Jun. 30, 2015
Jun. 30, 2016
DKK
Dec. 31, 2015
USD ($)
Dec. 31, 2015
DKK
Income Tax Examination [Line Items]                
Effective income tax provision (as a percent)   31.50% 28.30% 31.00% 28.80%      
Statutory U.S. federal income tax (as a percent)   35.00% 35.00% 35.00% 35.00%      
Uncertain tax liability   $ 79.0   $ 79.0        
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   223.8   $ 223.8   DKK 1,501.7 $ 199.6 DKK 1,363.1
Estimate of gross liability due SKAT       126.0        
Estimate of gross liability due SKAT able to be recovered       47.0        
VAT Taxes Withheld by Tax Authority   $ 32.6   $ 32.6     $ 26.0  
Danish tax authority | Subsequent Event                
Income Tax Examination [Line Items]                
Deposit paid to mitigate additional interest and foreign exchange exposure $ 92.0