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Income Taxes - Additional Information (Details)
DKK in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2016
DKK
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
DKK
Dec. 31, 2016
DKK
Income Tax Examination [Line Items]              
Remeasurement of deferred taxes   $ 0.0 $ (69.7) $ 0.0      
Tax reform tax rate change (percentage)   (0.00%) 37.00% (0.00%)      
Effective income tax provision (percentage)     25.70% 39.00%      
Transition Tax   $ 0.0 $ 45.9 $ 0.0      
Transition Tax (percentage)   0.00% 24.40% 0.00%      
Unrecognized tax benefits   $ 67.7   $ 21.4 $ 67.7    
Income tax penalties and interest expense     $ 0.4 1.6 33.5    
Accrued interest and penalties   43.8 59.9 52.3 43.8    
Uncertain tax liability   $ 69.8 84.5 71.7 $ 69.8    
Deferred income taxes     107.1 142.4      
Valuation allowance     55.1 45.2      
Tax deposit paid DKK 615.2   98.9 87.2      
US State              
Income Tax Examination [Line Items]              
Operating loss carryforwards, valuation allowance     124.2        
Tax credit carryforward, valuation allowance     8.1        
US Federal              
Income Tax Examination [Line Items]              
Tax credit carryforward, valuation allowance     $ 12.2        
Danish Tax Authority              
Income Tax Examination [Line Items]              
Royalty rate assessed on Danish earnings (percentage)     20.00%        
Cumulative assessment amount including interest and penalties     $ 264.3 219.3   DKK 1,638.4 DKK 1,547.3
Uncertain tax liability     137.8 120.6   854.0 850.0
Deferred income taxes     47.2 43.5      
Valuation allowance     19.3 17.6      
VAT taxes withheld by tax authority     54.1 36.6   336.5 258.0
VAT refund applied to income tax liability DKK 224.6   36.1 31.8      
Tax Years 2001-2011 | Danish Tax Authority              
Income Tax Examination [Line Items]              
Uncertain tax liability     134.8 118.5   835.0  
Tax Years After 2011 | Danish Tax Authority              
Income Tax Examination [Line Items]              
Uncertain tax liability     $ 3.0 $ 2.1   DKK 18.0 DKK 15.0