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Restructuring Activities (Details) $ in Millions			3 Months Ended	12 Months Ended
		Oct. 31, 2023 item	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($) item	Mar. 31, 2023 USD ($)
Restructuring and Repositioning Expenses [Abstract]
Employee severance and related benefits				$ 24.3	$ 12.9	$ 3.5
Other restructuring and repositioning expenses				3.9	2.1	1.5
Total				28.2	15.0	5.0
Changes in Accrued Severance [Roll Forward]
Beginning balance			$ 6.6	13.0	10.6
Additions				18.3	12.9
Payments				(24.6)	(7.8)
Disposition	[1]				(2.5)
Effect of exchange rate changes				(0.1)	(0.2)
Ending balance				6.6	$ 13.0	10.6
Non-cash severance expenses excluded from Fiscal 2025				6.0
Number of automotive businesses sold | item		3			3
Severance expenses				$ 24.3	$ 12.9	$ 3.5
Performance Technologies
Restructuring and Repositioning Expenses [Abstract]
Employee severance and related benefits			4.0
Changes in Accrued Severance [Roll Forward]
Severance expenses			$ 4.0
[1] The fiscal 2025 amount excludes $6.0 million of non-cash severance-related costs resulting from the accelerated vesting of certain stock-based compensation awards in connection with restructuring actions.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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