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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Summary of Information Related to Common Share Balances
The following table summarizes information related to Common Share balances as at December 31:

(number of shares in millions)202320222021
Share capital, January 1930.5 929.7 666.3 
Shares issued under stock option plan1.6 0.8 0.8 
   Shares issued for KCS acquisition (Note 11)
— — 262.6 
Share capital, December 31932.1 930.5 929.7