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Income Taxes (Components of Income Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current expense        
Federal and other $ (0.1) $ 5.8 $ 2.7  
Foreign 24.3 42.2 25.8  
Total current income tax expense 24.2 48.0 28.5  
Deferred expense (benefit)        
Federal and other (2.0) 8.4 11.1  
Foreign (5.6) 0.3 11.6  
Total deferred income tax expense (7.6) 8.7 22.7  
Income tax expense $ 16.6 $ 56.7 $ 51.2 $ 24.0