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Share-based payments - Outstanding Stock Options (Details)
 12 Months Ended
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Share-based Payment Arrangements [Abstract]    
Outstanding, beginning balance (in shares) | shares 7,484,561 7,802,108
Exercised (in shares) | shares 0 (306,139)
Forfeited or expired (in shares) | shares (938,742) (11,408)
Outstanding, ending balance (in shares) | shares 6,545,819 7,484,561
Weighted average exercise price of share options outstanding, beginning balance (in cad per share) $ 61 $ 61
Weighted average exercise price of share options exercised (in cad per share)   60
Weighted average exercise price of share options forfeited or expired (in cad per share) 59 63
Weighted average exercise price of share options outstanding, ending balance (in cad per share) 61 61
Weighted average share price, share options exercised (in cad per share) $ 0 $ 63