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Income Taxes (Details)
kr in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
Mar. 31, 2019
DKK (kr)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
DKK (kr)
Income Tax Examination [Line Items]          
Effective income tax provision (as a percent) 36.80% 28.10%      
Unrecognized tax benefits that would impact effective tax rate $ 90.7     $ 91.4  
Danish Tax Authority (SKAT) | Foreign Tax Authority          
Income Tax Examination [Line Items]          
Settlement 127.3   kr 847.3 130.0  
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2001-2011          
Income Tax Examination [Line Items]          
Accrued tax and interest 144.5   962.3 145.7  
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years Post 2011          
Income Tax Examination [Line Items]          
Accrued tax and interest 35.8   kr 238.2 35.3 kr 230.3
Deferred tax assets $ 4.9     $ 4.2