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Income Taxes (Components of Income Before Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic operations $ 37.0 $ 68.7 $ 33.9
Foreign operations 120.9 89.4 91.2
Income before income tax $ 157.9 $ 158.1 $ 125.1