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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 23.3	$ 22.6	$ 57.7	$ 77.5
Impact of accelerated vesting on equity awards	1.5	0.0	2.1	0.0
Total share-based compensation expense	24.8	22.6	59.8	77.5
Tax impact	(4.1)	(4.4)	(10.4)	(15.3)
Increase in net loss or reduction in net income	20.7	18.2	49.4	62.2
Stock Options
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	1.5	4.1	5.6	15.6
Restricted Share Units and Other Share-based Compensation
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	20.8	16.4	49.7	56.4
Share Appreciation Rights (SARs)
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 1.0	$ 2.1	$ 2.4	$ 5.5

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Amount, after tax, of expense for award under share-based payment arrangement.

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

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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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