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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	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

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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