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Shareholders' equity - Stock-based payments - Assumptions & Options (Details) | 12 Months Ended |  |  |
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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 |  |  |  |  |

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