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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 20.0 $ 17.2 $ 57.2 $ 41.0
Impact of accelerated vesting on equity awards 0.0 0.0 2.8 0.3
Total share-based compensation expense 20.0 17.2 60.0 41.3
Tax impact (3.9) (3.6) (12.2) (8.7)
Reduction in net income 16.1 13.6 47.8 32.6
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 4.4 5.5 13.7 14.3
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 14.3 9.8 37.6 23.1
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 1.3 $ 1.9 $ 5.9 $ 3.6