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Capital Stock (Shares Reserved for Future Issuance) (Details) - shares shares in Millions	Mar. 31, 2019	Mar. 31, 2018
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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Aggregate number of common shares reserved for future issuance.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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