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Share-based compensation plans (Share options number and weighted average price) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2022
shares
CAD ($)
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
CAD ($)
$ / shares
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Number And Weighted Average Exercise Prices Of Share Options [Abstract]                
Beginning of year | shares     3,458,001     6,158,539    
Options granted | shares     0     0    
Options forfeited | shares     0     (18,005)    
Options expired | shares     (2,475)     (886,009)    
Options exercised   (401,955) (401,955)   (1,796,524) (1,796,524)    
End of year | shares     3,053,571     3,458,001    
Weighted average exercisable price - beginning of year       $ 16.72     $ 16.98  
Weighted average exercisable price for options granted       0     0  
Weighted average exercisable price for options forfeited       0     26.08  
Weighted average exercisable price for options expired       26.81     22.05  
Weighted average exercise price for options exercised       23.96     14.90  
Weighted average exercisable price - end of year       $ 15.75     $ 16.72  
Exercisable | shares 3,053,571 3,053,571 3,053,571 3,053,571 3,162,415 3,162,415 3,162,415  
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Number Of Outstanding Share Options | shares 3,053,571 3,053,571 3,053,571 3,053,571 3,458,001 3,458,001 3,458,001 6,158,539
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement $ 15.75 $ 15.75 $ 15.75 $ 15.75 $ 16.72 $ 16.72 $ 16.72 $ 16.98
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares 3,053,571 3,053,571 3,053,571 3,053,571 3,162,415 3,162,415 3,162,415  
Options exercisable - Weighted average exercisable price $ 15.75 $ 15.75 $ 15.75 $ 15.75 $ 16.85 $ 16.85 $ 16.85  
$11.32 - 15.83 [member]                
Number And Weighted Average Exercise Prices Of Share Options [Abstract]                
End of year | shares     1,772,271          
Weighted average exercisable price - end of year       $ 14.57        
Exercisable | shares 1,772,271 1,772,271 1,772,271 1,772,271        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Number Of Outstanding Share Options | shares 1,772,271 1,772,271 1,772,271 1,772,271        
Options outstanding - Weighted average remaining life 3 years 2 months 12 days              
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement $ 14.57 $ 14.57 $ 14.57 $ 14.57        
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares 1,772,271 1,772,271 1,772,271 1,772,271        
Options exercisable - Weighted average exercisable price $ 14.57 $ 14.57 $ 14.57 $ 14.57        
$11.32 - 15.83 [member] | Bottom of range [member]                
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Option price per share 11.32 11.32 11.32 11.32        
$11.32 - 15.83 [member] | Top of range [member]                
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Option price per share $ 15.83 $ 15.83 $ 15.83 15.83        
$15.84 - 19.30 [member]                
Number And Weighted Average Exercise Prices Of Share Options [Abstract]                
End of year | shares     1,281,300          
Weighted average exercisable price - end of year       $ 17.39        
Exercisable | shares 1,281,300 1,281,300 1,281,300 1,281,300        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Number Of Outstanding Share Options | shares 1,281,300 1,281,300 1,281,300 1,281,300        
Options outstanding - Weighted average remaining life 9 months 18 days              
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement $ 17.39 $ 17.39 $ 17.39 $ 17.39        
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares 1,281,300 1,281,300 1,281,300 1,281,300        
Options exercisable - Weighted average exercisable price $ 17.39 $ 17.39 $ 17.39 $ 17.39        
$15.84 - 19.30 [member] | Bottom of range [member]                
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Option price per share 15.84 15.84 15.84 15.84        
$15.84 - 19.30 [member] | Top of range [member]                
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]                
Option price per share $ 19.3 $ 19.3 $ 19.3 $ 19.3