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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (0.5)	$ 1,906.9	$ 2,237.7
Components of other comprehensive income:
Actuarial gains related to defined benefit pension plans, net of tax effect	1.8	0.6	16.6
Change in net foreign currency translation adjustment	0.0	0.0	(0.1)
Other comprehensive income, net of tax effect	1.8	0.6	16.5
Comprehensive income	$ 1.3	$ 1,907.5	$ 2,254.2

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