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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 22.8	$ 14.5	$ 37.2	$ 23.8
Impact of accelerated vesting on equity awards	2.8	0.0	2.8	0.3
Total share-based compensation expense	25.6	14.5	40.0	24.1
Tax impact	(5.3)	(3.1)	(8.2)	(5.1)
Reduction in net income	20.3	11.4	31.8	19.0
Stock Options
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	5.0	5.2	9.3	8.8
Restricted Share Units and Other Share-based Compensation
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	14.4	8.5	23.3	13.3
Share Appreciation Rights (SARs)
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 3.4	$ 0.8	$ 4.6	$ 1.7

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors, certain consultants qualifying for treatment as employees, including the impact of compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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- Definition

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

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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