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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 85.5 $ 50.0 $ 52.1
Impact of accelerated vesting on equity awards 3.5 0.6 16.0
Total share-based compensation expense 89.0 50.6 68.1
Tax impact (17.8) (10.7) (15.7)
Reduction in net income 71.2 39.9 52.4
Stock Options      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 18.7 17.8 23.0
Restricted Share Units and Other Share-based Compensation      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 58.8 29.1 24.7
Share Appreciation Rights (SARs)      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 8.0 $ 3.1 $ 4.4