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Restructuring and Other (Severance Liability Rollforward) (Details) - Severance liability - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Restructuring and Other Severance Liability    
Beginning balance $ 23.6 $ 8.7
Accruals 3.1 4.3
Severance payments (10.0) (8.2)
Ending balance 16.7 $ 4.8
Accounts Payable and Accrued Liabilities [Member]    
Restructuring Cost and Reserve [Line Items]    
Remaining severance liability, expected to be paid in next 12 months $ 16.7