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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - shares shares in Millions	Sep. 30, 2024	Mar. 31, 2024
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	43.5	49.5
Stock Options and SARs
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	18.4	20.7
Restricted Stock and Restricted Share Units - Unvested
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	15.2	13.4
Common shares available for future issuance
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	9.9	15.4

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- Definition

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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