Income Taxes - Current and Deferred Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Current provision (benefit):
Federal	$ 0.8	$ (69.6)	$ 5.8
States	(7.0)	0.1	0.4
International	0.1	1.1	0.6
Total current provision (benefit)	(6.1)	(68.4)	6.8
Deferred provision (benefit):
Federal	(4.0)	(45.4)	(22.5)
States	1.5	(15.1)	(2.6)
International	0.0	0.0	0.0
Total deferred provision (benefit)	(2.5)	(60.5)	(25.1)
Income tax benefit	$ (8.6)	$ (128.9)	$ (18.3)

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