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Income Taxes (Income Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
U.S. operations $ 161.2 $ 132.9 $ 96.5
International operations 130.6 107.8 125.9
Income before income taxes $ 291.8 $ 240.7 $ 222.4