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Income Taxes - Components of Income Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current expense (benefit)      
Federal and other $ 2.0 $ (0.1) $ 5.8
Foreign 28.5 24.3 42.2
Total current income tax expense 30.5 24.2 48.0
Deferred expense (benefit)      
Federal and other (16.5) (2.0) 8.4
Foreign (4.5) (5.6) 0.3
Total deferred income tax (benefit) expense (21.0) (7.6) 8.7
Total income tax expense $ 9.5 $ 16.6 $ 56.7