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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Share-Based Compensation Expense [Line Items] |  |
Share-based compensation expense | $ 34.6 | $ 14.4
Tax impact | (6.6) | (3.0)
Reduction in net income | 28.0 | 11.4
Stock Options |  |
Share-Based Compensation Expense [Line Items] |  |
Share-based compensation expense | 9.4 | 4.3
Restricted Share Units and Other Share-based Compensation |  |
Share-Based Compensation Expense [Line Items] |  |
Share-based compensation expense | 22.9 | 8.9
Share Appreciation Rights (SARs) |  |
Share-Based Compensation Expense [Line Items] |  |
Share-based compensation expense | $ 2.3 | $ 1.2

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