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Income Taxes, Tax Cuts and Jobs Act (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax Cuts and Jobs Act of 2017 [Abstract]          
Corporate income tax rate     35.00% 35.00% 35.00%
Charge to deferred income tax expense for effects of Tax Reform Act $ 47.7        
Recognition of valuation allowance on foreign tax credit carryforwards 52.0        
Charge to deferred income tax expense related to reversal of indefinite reinvestment assertion 7.3        
Charge to deferred income tax expense related to reduction in FIN 48 assets 4.1        
Benefit related to write-off of net outside basis deferred tax liabilities (7.7)        
Benefit related to tax effect on OCI (3.1)        
Benefit related to estimated impact of remeasurement of deferred tax assets and liabilities (4.9)        
Estimated Toll Charge $ 96.0        
Plan [Member]          
Tax Cuts and Jobs Act of 2017 [Abstract]          
Corporate income tax rate   21.00%