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Income Taxes (Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current expense:      
Federal $ 5.9 $ 6.4 $ 14.3
State 0.7 0.6 0.7
Foreign 7.2 9.0 7.6
Total 13.8 16.0 22.6
Deferred expense (benefit):      
Federal 1.8 1.3 (5.4)
State (0.2) 0.1 0.3
Foreign (0.2) (0.8) 0.7
Total 1.4 0.6 (4.4)
Income tax expense $ 15.2 $ 16.6 $ 18.2