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Income Taxes, Income Tax Provision (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Federal [Abstract]      
Current $ (0.1) $ (3.4) $ (20.4)
Deferred 58.3 (1.7) (4.2)
State [Abstract]      
Current 0.4 (0.1) 0.7
Deferred 9.2 (2.3) 1.9
Foreign [Abstract]      
Current 22.0 14.9 19.0
Deferred 0.4 5.0 (2.1)
Total income tax provision (benefit) $ 90.2 $ 12.4 $ (5.1)