Income Taxes, Income Tax (Benefit) Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Federal [Abstract]
Current	$ 1.5	$ 0.1	$ (0.1)
Deferred	(47.5)	0.0	58.3
State [Abstract]
Current	2.3	1.1	0.4
Deferred	(11.4)	0.0	9.2
Foreign [Abstract]
Current	27.5	17.8	22.0
Deferred	(0.7)	(3.8)	0.4
Total income tax (benefit) provision	$ (28.3)	$ 15.2	$ 90.2