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Share Capital and Employee Compensation Plans - Option Activity (Details)
 12 Months Ended
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Disclosure of share-based payment arrangements [Abstract]    
Share options outstanding, beginning (shares) | shares 377,000.0 279,000.0
Granted (shares) | shares 167,100 191,600
Exercised (shares) | shares (79,500)
Expired (shares) | shares (14,400) (4,300)
Forfeited (shares) | shares (16,500) (9,800)
Share options outstanding, ending (shares) | shares 513,200 377,000.0
Outstanding, beginning of period (CAD$ per share) | $ / shares $ 23.01 $ 21.38
Granted (CAD$ per share) | $ / shares 21.18 22.95
Exercised (CAD$ per share) | $ / shares   15.12
Expired (CAD$ per share) | $ / shares 23.61 41.62
Forfeited (CAD$ per share) | $ / shares 25.39 31.32
Outstanding, end of period (CAD$ per share) | $ / shares $ 22.32 $ 23.01