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Income Taxes (Income from Continuing Operations Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ 35.1 $ 21.4 $ 15.4
Outside the United States 36.7 26.3 25.6
Income before income taxes $ 71.8 $ 47.7 $ 41.0