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Income Taxes, 2017 Tax Cuts and Jobs Act (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Sep. 30, 2018
USD ($)
Dec. 31, 2017
Income Taxes        
U.S. statutory federal tax rate (as a percent)     21.00% 35.00%
Estimated Tax Act Charge   $ 398.5 $ 0.0  
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)    
Number of components | item   3    
Transition Tax installment paid $ 18.0