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Income Taxes, 2017 Tax Cuts and Jobs Act (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes          
U.S. statutory federal tax rate (as a percent) 35.00%   21.00% 21.00% 35.00%
Provisional Tax Act Charge         $ 398.5
Estimated Transition Tax         259.4
Provisional charge on unremitted foreign earnings         176.6
Income tax expense (benefit) associated with the remeasurement of net deferred tax liabilities         $ (37.5)
Income tax expense (benefit)   $ (14.5)   $ (14.5)  
Period for payment of Transition Tax     8 years