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Income Taxes (Unrecognized Tax Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Unrecognized Tax Benefits [Roll Forward]    
Unrecognized tax benefits at January 1 $ 56.8 $ 45.3
Increases related to: tax positions taken during a prior period 7.1 11.8
Increases related to: tax positions taken during the current period 0.4 0.4
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 0.1 0.0
Decreases related to: lapse of applicable statute of limitations (4.8) (0.7)
Decreases related to: settlements with taxing authorities (0.2) 0.0
Unrecognized tax benefits at December 31 $ 59.2 $ 56.8