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Shareholders' Equity - Stock-based payments - Assumptions Options (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
shares
Dec. 31, 2024
Y
shares
Dec. 31, 2024
shares
Dec. 31, 2024
shares
Dec. 31, 2024
EquityInstruments
shares
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
Y
$ / shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
EquityInstruments
$ / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2024
Dec. 31, 2024
EquityInstruments
Dec. 31, 2024
$ / shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
EquityInstruments
Mar. 07, 2018
shares
Share-Based Compensation Expenses                                        
Aggregate number of common shares | shares                                       9,700,876
Risk-free interest rate       3.08%             4.08%                  
Expected dividend yield       1.20%             1.10%                  
Expected price volatility of the Company's common shares       26.40%             30.90%                  
Expected life of the option | Y   4             4                      
Forfeiture rate       0.00%             0.00%                  
Weighted average life 3 years 8 months 8 days                                      
Stock options outstanding, beginning of year (in shares)     669,201   669,201             724,653                
Granted (in shares) | EquityInstruments         45,396             5,548                
Exercised (in shares) | EquityInstruments         (71,864)             (61,000)                
Forfeited (in shares) | EquityInstruments         (10,353)                              
Stock options outstanding, end of the year (in shares)     632,380   632,380         669,201   669,201                
Exercisable stock options, end of the year (in shares) 524,919 524,919 524,919 524,919 524,919 524,919 524,919                 524,919     570,572  
Stock options outstanding, beginning of year (in dollars per share)           $ 111.76             $ 107.34              
Granted (in dollars per share)           167.57             169.78              
Exercised (in dollars per share)           52.67             64.5              
Forfeited (in dollars per share)           180.58                            
Stock options outstanding, end of year (in dollars per share)           121.36             111.76              
Exercisable stock options, end of the year (in dollars per share)               $ 100.51 $ 100.51 $ 100.51 $ 100.51 $ 100.51 100.51       $ 110.82      
Stock options                                        
Share-Based Compensation Expenses                                        
Term of options 10 years             10 years                        
Maximum percentage of common shares issued to single insider participant under compensation plan within one year                             5.00%          
Vesting period 5 years             5 years                        
Weighted average fair value per stock option | $                                   $ 1.7 $ 0.2  
Weighted average fair value per stock option (in dollars per share)           $ 38.06             $ 47.02              
Expenses related to stock options | $             $ 1.1             $ 1.5            
Capitalized to royalty, stream and working interest, net | $             $ 0.2             $ 0.1            
Total unrecognized non-cash stock-based compensation expense | $                                   $ 2.6 $ 1.8  
Weighted average life 2 years 6 months             2 years 4 months 24 days                        
Stock options | Maximum                                        
Share-Based Compensation Expenses                                        
Term of options 10 years