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Shareholders' equity (Tables)
12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Summary of Information Related to Common Share Balances
The following table summarizes information related to Common Share balances:

(number of shares in millions)202420232022
Share capital, January 1932.1 930.5 929.7 
   Common Shares issued under stock option plans1.4 1.6 0.8 
Share capital, December 31933.5 932.1 930.5