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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Effective income tax provision (in hundredths) 37.40% 27.80% 41.00% 34.70%  
Statutory U.S. federal income tax (in hundredths) 35.00%   35.00% 35.00%  
Income Tax Examination [Line Items]          
Uncertain tax benefits $ 44,100,000   $ 44,100,000   $ 26,100,000
Interest and penalties accrued 11,800,000   11,800,000   11,000,000.0
Danish tax authority
         
Income Tax Examination [Line Items]          
Royalty Rate Assessed on Danish Earnings     20.00%    
Cumulative Assessment Amount Including Interest And Penalties $ 222,300,000   $ 222,300,000