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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 26.0 $ 26.6 $ 41.9 $ 34.4
Impact of accelerated vesting on equity awards 1.1 0.0 1.6 0.6
Total share-based compensation expense 27.1 26.6 43.5 35.0
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 0.5 2.3 1.4 4.0
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 25.0 23.2 39.3 28.9
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 0.5 $ 1.1 $ 1.2 $ 1.5