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Capital Stock (Shares Reserved for Future Issuance) (Details) - shares shares in Millions | Mar. 31, 2019 | Mar. 31, 2018
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 43.3 | 46.7
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 34.6 | 32.1
Restricted Share Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.0 | 2.2
Common shares available for future issuance under plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 6.7 | 10.3
April 2013 Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Coupon rate |  | 1.25%
Convertible Senior Subordinated Notes | April 2013 Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 0.0 | 2.1

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