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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 100.0 $ 85.5 $ 50.0
Impact of accelerated vesting on equity awards 0.0 3.5 0.6
Total share-based compensation expense 100.0 89.0 50.6
Tax impact (19.7) (17.8) (10.7)
Reduction in net income 80.3 71.2 39.9
Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 19.2 18.7 17.8
Restricted Share Units and Other Share-based Compensation      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 73.4 58.8 29.1
Share Appreciation Rights (SARs)      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 7.4 $ 8.0 $ 3.1