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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - shares shares in Millions	Sep. 30, 2019	Mar. 31, 2019
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	51.2	43.3
Stock Options and Equity-Settled SARs
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	38.9	34.6
Restricted Stock and Restricted Share Units - Unvested
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	4.1	2.0
Common shares available for future issuance
Common Shares Reserved For Future Issuance [Line Items]
Shares reserved for future issuance (in shares)	8.2	6.7

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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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No definition available.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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