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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 17.6 $ 26.0 $ 35.7 $ 41.9
Impact of accelerated vesting on equity awards 4.9 1.1 4.9 1.6
Total share-based compensation expense 22.5 27.1 40.6 43.5
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 0.2 0.5 0.5 1.4
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 17.2 25.0 34.9 39.3
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 0.2 $ 0.5 $ 0.3 $ 1.2