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Income Taxes Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]          
Tax benefit resulting from impact of Tax Act     $ (3.3) $ (57.7) $ 0.0
Charge related to the Transition Tax $ 4.6     32.5  
Effect of Measurement Period Adjustment on Effective Tax Rate, Percent     1.00%    
Benefit from permanent rate reduction     $ 88.9 $ 90.2  
Discrete Income Tax Expense (Benefit)   $ 1.3