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Description of Business, Basis of Presentation and Significant Accounting Policies (Anti-dilutive Shares Issuable) (Details) - shares shares in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Anti-dilutive shares issuable [Line Items]
Antidilutive securities excluded from the calculation of diluted earnings per share due to net loss, amount	2.2	7.1
Anti-dilutive shares issuable	37.8	23.7	12.9
Share Purchase Options
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable	31.4	21.3	11.5
Restricted Share Units (RSUs)
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable	2.4	1.0	0.2
Other Issuable Shares
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable	4.0	1.4	1.2

X

- Definition

Antidilutive Securities Excluded From Calculation of Diluted Earnings Per Share Due to Net Loss, Amount

+ References

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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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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