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Shareholders equity - Stock-based payments - Assumptions Options (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
$ / shares
Dec. 31, 2021
USD ($)
EquityInstruments
Dec. 31, 2020
$ / shares
Dec. 31, 2020
USD ($)
EquityInstruments
Dec. 31, 2021
USD ($)
EquityInstruments
Dec. 31, 2020
USD ($)
EquityInstruments
Mar. 07, 2018
shares
Stock-based payments              
Aggregate number of common shares | shares             9,700,876
Risk-free interest rate   1.21%   0.39%      
Expected dividend yield   0.91%   0.78%      
Expected price volatility of the Company's common shares   29.10%   28.80%      
Forfeiture rate   0.00%   0.00%      
Weighted average life   5 years 10 months 6 days          
Stock options outstanding, beginning of year (in shares) | EquityInstruments   745,962   836,427      
Granted (in shares) | EquityInstruments   81,698   61,594      
Exercised (in shares) | EquityInstruments   (5,614)   (150,482)      
Forfeited (in shares) | EquityInstruments       (1,577)      
Stock options outstanding, end of the year (in shares) | EquityInstruments   822,046   745,962      
Exercisable stock options, end of the year (in shares) | EquityInstruments         664,589 596,402  
Stock options outstanding, beginning of year (in dollars per share) $ 90.08   $ 80.01        
Granted (in dollars per share) 168.43   171.33        
Exercised (in dollars per share) 87.60   67.13        
Forfeited (in dollars per share)     112.84        
Stock options outstanding, end of year (in dollars per share) 97.88   90.08        
Exercisable stock options, end of the year (in dollars per share) 83.03   76.14        
Stock options              
Stock-based payments              
Maximum percentage of common shares issued to single insider participant under compensation plan within one year         5.00%    
Term of options   10 years   10 years      
Vesting period   5 years   3 years      
Weighted average fair value per stock option | $         $ 2.5 $ 1.7  
Weighted average fair value per stock option (in dollars per share) $ 37.96   $ 36.67        
Expenses related to stock options | $   $ 2.1   $ 2.2      
Capitalized to royalty, stream and working interest, net | $   $ 0.1   $ 0.1      
Total unrecognized non-cash stock-based compensation expense | $         $ 3.3 $ 2.9  
Weighted average life   2 years 6 months   1 year 8 months 12 days      
Stock options | Maximum              
Stock-based payments              
Term of options   10 years