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Capital Stock - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 40.3	$ 2.8
Impact of accelerated vesting on equity awards	0.8	(1.1)
Total share-based compensation expense	41.1	1.7
Stock options
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	1.2	0.1
Restricted share units and other share-based compensation
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	39.1	2.5
Share appreciation rights
Share-Based Compensation Expense [Line Items]
Share-based compensation expense	$ 0.0	$ 0.2

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

No definition available.

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- Definition

Share-Based Payment Arrangement, Accelerated Vesting

+ 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 S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1

Reference 2: 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 3: 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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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