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Shareholders equity - Stock-based payments - Exercise price (Details)
 12 Months Ended
Dec. 31, 2021
EquityInstruments
$ / shares
Dec. 31, 2020
EquityInstruments
Dec. 31, 2019
EquityInstruments
Shareholders' equity      
Options outstanding 822,046 745,962 836,427
Options exercisable 664,589 596,402  
Weighted average life 5 years 10 months 6 days    
C$40.87      
Shareholders' equity      
Exercise price | $ / shares $ 40.87    
Options outstanding 32,451    
Options exercisable 32,451    
Weighted average life 1 year 11 months 8 days    
C$46.17      
Shareholders' equity      
Exercise price | $ / shares $ 46.17    
Options outstanding 75,000    
Options exercisable 75,000    
Weighted average life 1 year 7 months 17 days    
C$55.58      
Shareholders' equity      
Exercise price | $ / shares $ 55.58    
Options outstanding 17,397    
Options exercisable 17,397    
Weighted average life 11 months 12 days    
C$58.67      
Shareholders' equity      
Exercise price | $ / shares $ 58.67    
Options outstanding 20,000    
Options exercisable 20,000    
Weighted average life 3 years 7 months 20 days    
C$59.52      
Shareholders' equity      
Exercise price | $ / shares $ 59.52    
Options outstanding 33,876    
Options exercisable 33,876    
Weighted average life 2 years 11 months 12 days    
C$65.76      
Shareholders' equity      
Exercise price | $ / shares $ 65.76    
Options outstanding 55,853    
Options exercisable 55,853    
Weighted average life 3 years 11 months 12 days    
C$75.45      
Shareholders' equity      
Exercise price | $ / shares $ 75.45    
Options outstanding 120,074    
Options exercisable 120,074    
Weighted average life 4 years 11 months 8 days    
C$88.76      
Shareholders' equity      
Exercise price | $ / shares $ 88.76    
Options outstanding 45,082    
Options exercisable 45,082    
Weighted average life 6 years 7 months 20 days    
C$94.57      
Shareholders' equity      
Exercise price | $ / shares $ 94.57    
Options outstanding 90,409    
Options exercisable 90,409    
Weighted average life 6 years 11 months 12 days    
C$100.10      
Shareholders' equity      
Exercise price | $ / shares $ 100.10    
Options outstanding 84,523    
Options exercisable 84,523    
Weighted average life 5 years 11 months 8 days    
C$129.32      
Shareholders' equity      
Exercise price | $ / shares $ 129.32    
Options outstanding 104,089    
Options exercisable 69,393    
Weighted average life 7 years 11 months 12 days    
C$168.43      
Shareholders' equity      
Exercise price | $ / shares $ 168.43    
Options outstanding 81,698    
Weighted average life 9 years 11 months 8 days    
C$171.33      
Shareholders' equity      
Exercise price | $ / shares $ 171.33    
Options outstanding 61,594    
Options exercisable 20,531    
Weighted average life 8 years 11 months 8 days