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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - shares shares in Millions	Sep. 30, 2023	Mar. 31, 2023
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	42.6	50.2
Stock Options and SARs
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	20.8	24.8
Restricted Stock and Restricted Share Units - Unvested
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	13.6	14.0
Common shares available for future issuance
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	8.2	11.4

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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

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-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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