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Income Taxes (Components of Income Before Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic operations $ 1.7 $ 32.0 $ 37.0
Foreign operations 76.9 131.5 120.9
Income before income tax $ 78.6 $ 163.5 $ 157.9