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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 18.4 $ 24.9 $ 54.1 $ 66.9
Impact of accelerated vesting on equity awards 0.0 6.8 4.9 8.4
Total share-based compensation expense 18.4 31.7 59.0 75.3
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 0.2 0.4 0.7 1.9
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 18.0 24.4 52.9 63.7
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 0.2 $ 0.1 $ 0.5 $ 1.3