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Income Taxes (Details)
kr in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
DKK (kr)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
Dec. 31, 2019
DKK (kr)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Income Tax Examination [Line Items]              
Effective income tax provision (as a percent) 27.80% 27.80% 36.80%        
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years Post 2011              
Income Tax Examination [Line Items]              
Income tax liability kr 1,115.8 $ 164.8   kr 1,110.0 $ 166.7    
Tax deposit 1,104.1     kr 970.1   $ 163.0 $ 145.6
Danish Tax Authority (SKAT) | Foreign Tax Authority | Tax Years 2012-2013              
Income Tax Examination [Line Items]              
Income tax liability kr 134.0