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Shareholders' equity - Stock-based payments - Assumptions & Options (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
Dec. 31, 2020
USD ($)
Y
EquityInstruments
Dec. 31, 2019
$ / shares
Dec. 31, 2019
USD ($)
Y
EquityInstruments
Dec. 31, 2020
USD ($)
EquityInstruments
Dec. 31, 2019
USD ($)
EquityInstruments
Mar. 07, 2018
shares
Stock-based payments              
Aggregate number of common shares | shares             9,700,876
Risk-free interest rate   0.39%   1.62%      
Expected dividend yield   0.78%   1.02%      
Expected price volatility of the Company's common shares   28.80%   27.50%      
Expected life of the option | Y   4   4      
Forfeiture rate   0.00%   0.00%      
Weighted average life   6 years 4 months 24 days          
Stock options outstanding, beginning of year (in shares) | EquityInstruments   836,427   1,015,409      
Granted (in shares) | EquityInstruments   61,594   104,881      
Exercised (in shares) | EquityInstruments   (150,482)   (283,863)      
Forfeited (in shares) | EquityInstruments   (1,577)          
Stock options outstanding, end of the year (in shares)   745,962   836,427      
Exercisable stock options, end of the year (in shares)         563,975 596,402  
Stock options outstanding, beginning of year (in dollars per share) $ 80.01   $ 69.13        
Granted (in dollars per share) 171.33   129.32        
Exercised (in dollars per share) 67.13   59.31        
Forfeited (in dollars per share) 112.84            
Stock options outstanding, end of year (in dollars per share) 90.08   80.01        
Exercisable stock options, end of the year (in dollars per share) 76.14   68.05        
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   3 years   3 years      
Weighted average fair value per stock option | $         $ 1,700,000 $ 2,200,000  
Weighted average fair value per stock option (in dollars per share) $ 36.67   $ 28.11        
Expenses related to stock options | $   $ 2,200,000   $ 2,300,000      
Capitalized to royalty, stream and working interest, net | $   $ 100,000   $ 500,000      
Total unrecognized non-cash stock-based compensation expense | $         $ 2,900,000 $ 3,500,000  
Weighted average life   1 year 8 months 12 days   1 year 8 months 12 days      
Stock options | Maximum              
Stock-based payments              
Term of options   10 years