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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
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Anti-dilutive shares issuable [Line Items] |  |  |
Antidilutive securities excluded from the calculation of diluted earnings per share due to net loss, amount | 7.1 |  |
Anti-dilutive shares issuable | 23.7 | 12.9 | 19.1
Conversion of Notes |  |  |
Anti-dilutive shares issuable [Line Items] |  |  |
Anti-dilutive shares issuable | 0.0 | 0.0 | 5.2
Share Purchase Options |  |  |
Anti-dilutive shares issuable [Line Items] |  |  |
Anti-dilutive shares issuable | 21.3 | 11.5 | 12.1
Restricted Share Units (RSUs) |  |  |
Anti-dilutive shares issuable [Line Items] |  |  |
Anti-dilutive shares issuable | 1.0 | 0.2 | 0.6
Other Issuable Shares |  |  |
Anti-dilutive shares issuable [Line Items] |  |  |
Anti-dilutive shares issuable | 1.4 | 1.2 | 1.2

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- Definition Antidilutive Securities Excluded From Calculation of Diluted Earnings Per Share Due to Net Loss, Amount + References No definition available. + Details
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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 + Details
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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. + References No definition available. + Details
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