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Net Income (Loss) Per Share (Anti-Dilutive Shares Issuable) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares excluded from calculation of diluted earnings per share due to net loss (in shares)	0.9			3.2
Anti-dilutive shares issuable (in shares)	32.2	38.3	33.8	35.6
Share purchase options
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	28.2	31.1	28.0	30.2
Restricted Share Units (RSUs)
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	1.4	3.3	2.0	2.4
Other issuable shares
Anti-dilutive shares issuable [Line Items]
Anti-dilutive shares issuable (in shares)	2.6	3.9	3.8	3.0

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://www.xbrl.org/2003/role/disclosureRef
-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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