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Segment Information - Reconciliation of Total Segment Profit to the Company's Loss Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Segment profit	$ 201.5	$ 170.2	$ 184.8
Depreciation, Depletion and Amortization	(170.3)	(161.8)	(155.7)
Restructuring and other	(184.1)	(224.8)	(89.9)
Goodwill impairment	0.0	(663.9)	(1,261.7)
Operating loss	(170.4)	(903.5)	(1,348.2)
Interest expense	(45.6)	(47.2)	(58.6)
Interest and other income	4.9	3.5	0.6
Other expense	(7.2)	(7.5)	(6.7)
Gain (loss) on extinguishment of debt	(5.6)	21.2	58.7
Loss from continuing operations before income taxes	(223.9)	(933.5)	(1,354.2)
Compensation Expense:	17.5	23.2	25.7
Share based compensation expense including accelerated compensation	18.0	24.6	25.7
Accelerated share based compensation	0.5	1.4	0.0
Operating Segments
Segment Reporting Information [Line Items]
Compensation Expense:	16.8	17.6	16.0
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
Compensation Expense:	$ 0.7	$ 5.6	$ 9.7

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