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Income Taxes (Current and Deferred Income Tax Provision (Benefits)) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Current provision (benefit):      
Federal $ 9.1 $ (17.6) $ 7.8
States (0.7) (4.3) 2.2
International 6.7 2.0 4.5
Total current provision (benefit) 15.1 (19.9) 14.5
Deferred benefit:      
Federal (48.2) (269.0) (143.3)
States 5.8 (18.5) (9.9)
International 18.8 (12.0) (10.2)
Total deferred benefit (23.6) (299.5) (163.4)
Total benefit for income taxes $ (8.5) $ (319.4) $ (148.9)