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Net Income (Loss) Per Share (Anti-Dilutive Shares Issuable) (Details) - shares
shares in Millions
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares excluded from calculation of diluted earnings per share due to net loss (in shares) 7.4  
Anti-dilutive shares issuable (in shares) 15.3 35.3
Share purchase options    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 13.4 27.8
Restricted Share Units (RSUs)    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 0.0 2.6
Other issuable shares    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 1.9 4.9