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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 24.9	$ 23.3	$ 66.9	$ 57.7
Impact of accelerated vesting on equity awards	6.8	1.5	8.4	2.1
Total share-based compensation expense	31.7	24.8	75.3	59.8
Stock Options
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	0.4	1.5	1.9	5.6
Restricted Share Units and Other Share-based Compensation
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	24.4	20.8	63.7	49.7
Share Appreciation Rights (SARs)
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 0.1	$ 1.0	$ 1.3	$ 2.4

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.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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