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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, 2022
Mar. 31, 2021
Mar. 31, 2020
Anti-dilutive shares issuable [Line Items]      
Antidilutive securities excluded from the calculation of diluted earnings per share due to net loss, amount 5.3 2.2 2.2
Anti-dilutive shares issuable 18.6 29.1 37.8
Share Purchase Options      
Anti-dilutive shares issuable [Line Items]      
Anti-dilutive shares issuable 16.0 24.6 31.4
Restricted Share Units (RSUs)      
Anti-dilutive shares issuable [Line Items]      
Anti-dilutive shares issuable 0.4 1.4 2.4
Other Issuable Shares      
Anti-dilutive shares issuable [Line Items]      
Anti-dilutive shares issuable 2.2 3.1 4.0