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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - shares shares in Millions | Sep. 30, 2021 | Mar. 31, 2021
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Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 54.3 | 51.4
Stock Options and SARs |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 27.3 | 26.7
Restricted Stock and Restricted Share Units - Unvested |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 8.1 | 9.1
Common shares available for future issuance |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 18.9 | 15.6

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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=120391452&loc=d3e13212-122682 + Details
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