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Shareholders Equity - Stock-based payments - Assumptions Options (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
shares
Dec. 31, 2023
shares
Dec. 31, 2023
shares
Dec. 31, 2023
EquityInstruments
shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2023
Y
shares
Dec. 31, 2022
$ / shares
Dec. 31, 2022
USD ($)
EquityInstruments
Y
Dec. 31, 2023
Dec. 31, 2023
EquityInstruments
Dec. 31, 2023
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
EquityInstruments
Mar. 07, 2018
shares
Stock-based payments                              
Aggregate number of common shares | shares                             9,700,876
Risk-free interest rate     4.08%           2.93%            
Expected dividend yield     1.10%           0.92%            
Expected price volatility of the Company's common shares     30.90%           30.00%            
Expected life of the option | Y             4   4            
Forfeiture rate     0.00%           0.00%            
Weighted average life 4 years 8 months 15 days                            
Stock options outstanding, beginning of year (in shares) | EquityInstruments       724,653         822,046            
Granted (in shares) | EquityInstruments       5,548         67,604            
Exercised (in shares) | EquityInstruments       (61,000)         (148,295)            
Forfeited (in shares) | EquityInstruments                 (16,702)            
Stock options outstanding, end of the year (in shares)   669,201   669,201         724,653            
Exercisable stock options, end of the year (in shares) 570,572 570,572 570,572 570,572 570,572 570,572 570,572       570,572     584,522  
Stock options outstanding, beginning of year (in dollars per share)         $ 107.34     $ 97.88              
Granted (in dollars per share)         169.78     183.61              
Exercised (in dollars per share)         64.50     82.81              
Forfeited (in dollars per share)               168.43              
Stock options outstanding, end of year (in dollars per share)         111.76     107.34              
Exercisable stock options, end of the year (in dollars per share)               90.84       $ 100.51      
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               5 years            
Weighted average fair value per stock option | $                         $ 0.2 $ 2.5  
Weighted average fair value per stock option (in dollars per share)         $ 47.02     $ 47.35              
Expenses related to stock options | $           $ 1.5     $ 1.8            
Capitalized to royalty, stream and working interest, net | $           $ 0.1     $ 0.1            
Total unrecognized non-cash stock-based compensation expense | $                         $ 1.8 $ 3.1  
Weighted average life 2 years 4 months 24 days               2 years 8 months 12 days            
Stock options | Maximum                              
Stock-based payments                              
Term of options 10 years