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Income Taxes (Income Before Tax) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ 250.7 $ 218.7 $ 190.7
Foreign 20.0 18.1 13.5
Income before income taxes $ 270.7 $ 236.8 $ 204.2