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Restructuring and Other (Severance Liability Rollforward) (Details) - Severance liability - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Restructuring and Other Severance Liability    
Beginning balance $ 8.7 $ 1.5
Accruals 9.0 12.4
Severance payments (9.7) (3.8)
Ending balance 8.0 $ 10.1
Accounts Payable and Accrued Liabilities [Member]    
Restructuring Cost and Reserve [Line Items]    
Remaining severance liability, expected to be paid in next 12 months $ 8.0