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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Discrete Income Tax Expense (Benefit) $ 7.9 $ 19.1
Deferred Foreign Income Tax Expense (Benefit) $ 0.4 $ 12.1