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Net Loss Per Share (Anti-Dilutive Shares Issuable) (Details) - shares
shares in Millions
3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares excluded from calculation of diluted earnings per share due to net loss (in shares) 4.8 5.6
Anti-dilutive shares issuable (in shares) 17.6 21.0
Share purchase options    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 13.8 17.0
Restricted Share Units (RSUs)    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 0.0 0.2
Other issuable shares    
Anti-dilutive shares issuable [Line Items]    
Anti-dilutive shares issuable (in shares) 3.8 3.8