Income Taxes, Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Federal [Abstract]
Current	$ 0.1	$ (0.1)	$ (3.4)
Deferred	0.0	58.3	(1.7)
State [Abstract]
Current	1.1	0.4	(0.1)
Deferred	0.0	9.2	(2.3)
Foreign [Abstract]
Current	17.8	22.0	14.9
Deferred	(3.8)	0.4	5.0
Total income tax provision	$ 15.2	$ 90.2	$ 12.4