Income Taxes (Current and Deferred Income Tax Provision (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Current provision (benefit):
Federal	$ (62.5)	$ 11.9	$ 11.0
States	1.7	(0.4)	10.7
International	14.3	15.1	8.4
Total current provision (benefit)	(46.5)	26.6	30.1
Deferred provision (benefit):
Federal	(6.6)	(7.7)	0.9
States	(11.9)	(0.1)	(2.6)
International	0.0	2.5	0.0
Total deferred provision (benefit)	(18.5)	(5.3)	(1.7)
Total provision (benefit) for income taxes	$ (65.0)	$ 21.3	$ 28.4

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