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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Discrete Income Tax Expense (Benefit) $ 2.3 $ 11.2
Deferred Foreign Income Tax Expense (Benefit) $ 7.1 $ 11.7