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Restructuring and Other (Severance Liability Rollforward) (Details) - Severance liability - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Restructuring and Other Severance Liability
Beginning balance	$ 8.7	$ 1.5
Accruals	32.9	14.8
Severance payments	(12.1)	(5.0)
Ending balance	29.5	$ 11.3
Accounts Payable and Accrued Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Remaining severance liability, expected to be paid in next 12 months	$ 29.5

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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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