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Shareholders' equity - Stock-based payments - Assumptions & Options (Details)
$ / shares in Units, $ in Millions
 12 Months Ended 24 Months Ended
Dec. 31, 2019
USD ($)
EquityInstruments
$ / shares
$ / shares
Dec. 31, 2019
USD ($)
Y
EquityInstruments
$ / shares
Dec. 31, 2018
USD ($)
EquityInstruments
$ / shares
$ / shares
Dec. 31, 2018
USD ($)
Y
EquityInstruments
$ / shares
Dec. 31, 2019
USD ($)
EquityInstruments
$ / shares
Mar. 07, 2018
shares
Stock-based payments            
Aggregate number of common shares | shares           9,700,876
Risk-free interest rate   1.62%   2.05%    
Expected dividend yield   1.02%   1.38%    
Expected price volatility of the Company's common shares   27.50%   32.70%    
Expected life of the option | Y   4.00   5.00    
Forfeiture rate   0.00%   0.00%    
Weighted average life   6 years 10 months 10 days        
Stock options outstanding, beginning of year (in shares) | EquityInstruments   1,015,409   955,603 955,603  
Granted (in shares) | EquityInstruments   104,881   153,824    
Exercised (in shares) | EquityInstruments   (283,863)   (94,018)    
Stock options outstanding, end of the year (in shares) | EquityInstruments   836,427   1,015,409 836,427  
Exercisable stock options, end of the year (in shares) | EquityInstruments 596,402 596,402 710,064 710,064 596,402  
Stock options outstanding, beginning of year (in dollars per share)   $ 69.13   $ 64.48 $ 64.48  
Granted (in dollars per share)   129.32   92.77    
Exercised (in dollars per share)   59.00   60.49    
Stock options outstanding, end of year (in dollars per share)   80.01   69.13 80.01  
Exercisable stock options, end of the year (in dollars per share) $ 68.05 $ 68.05 $ 60.40 $ 60.40 $ 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% 5.00%     5.00%  
Term of options   10 years   10 years    
Vesting period         3 years  
Weighted average fair value per stock option | $ $ 2.2 $ 2.2 $ 3.0 $ 3.0 $ 2.2  
Weighted average fair value per stock option (in dollars per share) $ 28.11   $ 25.77      
Expenses related to stock options | $   2.3   2.6    
Capitalized to royalty, stream and working interest, net | $   0.5   0.4    
Total unrecognized non-cash stock-based compensation expense | $ $ 3.5 $ 3.5 $ 3.9 $ 3.9 $ 3.5  
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