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Share Capital and Employee Compensation Plans - Options Outstanding and Exercisable (Details)
 12 Months Ended
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]        
Number Outstanding at Year End (shares) | shares 513,200 513,200 377,000.0 279,000.0
Weighted Average Remaining Contractual Life (years) 5 years 3 months 18 days      
Weighted Average Exercise Price (CAD$ per share) $ 22.32   $ 23.01 $ 21.38
Number Exercisable at Year End (shares) | shares 213,000.0 213,000.0    
Weighted Average Exercise Price (CAD$ per share) $ 22.35      
$17.53 - $23.03        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number Outstanding at Year End (shares) | shares 446,400 446,400    
Weighted Average Remaining Contractual Life (years) 5 years 4 months 24 days      
Weighted Average Exercise Price (CAD$ per share) $ 21.13      
Number Exercisable at Year End (shares) | shares 159,100 159,100    
Weighted Average Exercise Price (CAD$ per share) $ 19.70      
$17.53 - $23.03 | Bottom of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 17.53    
$17.53 - $23.03 | Top of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 23.03    
$23.04 - $28.54        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number Outstanding at Year End (shares) | shares 21,100 21,100    
Weighted Average Remaining Contractual Life (years) 2 years 10 months 24 days      
Weighted Average Exercise Price (CAD$ per share) $ 26.54      
Number Exercisable at Year End (shares) | shares 21,100 21,100    
Weighted Average Exercise Price (CAD$ per share) $ 26.54      
$23.04 - $28.54 | Bottom of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 23.04    
$23.04 - $28.54 | Top of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 28.54    
$28.55 - $34.04        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number Outstanding at Year End (shares) | shares 38,800 38,800    
Weighted Average Remaining Contractual Life (years) 4 years 10 months 24 days      
Weighted Average Exercise Price (CAD$ per share) $ 30.07      
Number Exercisable at Year End (shares) | shares 25,900 25,900    
Weighted Average Exercise Price (CAD$ per share) $ 30.70      
$28.55 - $34.04 | Bottom of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 28.55    
$28.55 - $34.04 | Top of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 34.04    
$34.05 - $39.48        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number Outstanding at Year End (shares) | shares 6,900 6,900    
Weighted Average Remaining Contractual Life (years) 3 years 10 months 24 days      
Weighted Average Exercise Price (CAD$ per share) $ 39.48      
Number Exercisable at Year End (shares) | shares 6,900 6,900    
Weighted Average Exercise Price (CAD$ per share) $ 39.48      
$34.05 - $39.48 | Bottom of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 34.05    
$34.05 - $39.48 | Top of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Exercise price (in USD per share)   $ 39.48