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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 20.4 $ 22.8 $ 54.9 $ 37.2
Impact of accelerated vesting on equity awards 0.0 2.8 0.0 2.8
Total share-based compensation expense 20.4 25.6 54.9 40.0
Tax impact (4.3) (5.3) (10.9) (8.2)
Reduction in net income 16.1 20.3 44.0 31.8
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 2.2 5.0 11.5 9.3
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 17.1 14.4 40.0 23.3
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 1.1 $ 3.4 $ 3.4 $ 4.6