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Income Taxes (Current and Deferred Income Tax Provision (Benefits)) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Current provision (benefit):      
Federal $ (0.6) $ 9.1 $ (17.6)
States 3.0 (0.7) (4.3)
International 1.8 6.7 2.0
Total current provision (benefit) 4.2 15.1 (19.9)
Deferred provision (benefit):      
Federal (18.5) (48.2) (269.0)
States (1.8) 5.8 (18.5)
International 19.4 18.8 (12.0)
Total deferred benefit (0.9) (23.6) (299.5)
Total provision (benefit) for income taxes $ 3.3 $ (8.5) $ (319.4)