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Income Taxes (Components of Income Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current expense      
Federal and other $ 5.8 $ 2.7 $ 41.1
Foreign 42.2 25.8 30.5
Total current income tax expense 48.0 28.5 71.6
Deferred expense (benefit)      
Federal and other 8.4 11.1 (47.4)
Foreign 0.3 11.6 2.2
Total deferred income tax expense (benefit) 8.7 22.7 (45.2)
Income tax expense $ 56.7 $ 51.2 $ 26.4