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Income Taxes (Income Tax Components) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 47.7 $ 29.9 $ 20.6
State 16.5 8.6 10.6
Foreign 4.8 4.6 3.9
Total Current 69.0 43.1 35.1
Deferred:      
Federal & State 1.8 19.9 11.5
Foreign (0.4) (1.0) (0.4)
Total Deferred 1.4 18.9 11.1
Total $ 70.4 $ 62.0 $ 46.2