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Stock-based compensation - Weighted-Average Fair Value Assumptions (Details) - Stock Options
9 Months Ended
Sep. 30, 2024
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected option life (years) 4 years 9 months
Risk-free interest rate 3.88%
Expected share price volatility 28.38%
Expected annual dividends per share (in cad per share) $ 0.76
Expected forfeiture rate 3.12%
Weighted-average grant date fair value per option granted during the period (in cad per share) $ 33.27