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Share-based compensation (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 $ / shares shares | Dec. 31, 2021 CAD ($) Month shares $ / shares | Dec. 31, 2020 CAD ($) Month shares $ / shares | Dec. 31, 2019 $ / shares shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Weighted average share price | $ / shares |  | $ 16.04 | $ 14.83 |
Share-based compensation related to share options |  | $ 3,600,000 | $ 2,800,000 |
Share-based compensation capitalized |  | $ 200,000 | $ 100,000 |
Number of share options granted | shares |  | 763,700 | 1,201,100 |
Weighted average exercise price of share options granted | $ / shares |  | $ 13.27 | $ 13.51 |
Expected life | Month |  | 46 | 46 |
Osisko Development Corp [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share-based compensation related to share options |  | $ 2,300,000 |  |
Share-based compensation capitalized |  | $ 1,100,000 |  |
Number of share options granted | shares |  | 1,005,600 | 1,199,100 |
Weighted average exercise price of share options granted | $ / shares |  | $ 6.47 | $ 7.62 |
Expected life | Month |  | 45 | 48 |
Officers [Member] | Osisko Development Corp [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of Replacement restricted stock units granted | shares |  | 458,450 |  |
Deferred share units [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Weighted average value of deferred share units granted | $ / shares |  | $ 15.54 | $ 12.35 |
Deferred share units [Member] | Osisko Development Corp [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Weighted average value of deferred share units granted | $ / shares |  | 7.24 | 7.62 |
Restricted share units ("RSU") [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Weighted average value of restricted share units granted | $ / shares |  | $ 13.24 | $ 13.56 |
Number of restricted stock units forfeited | shares |  | 215,812 |  |
Restricted share units ("RSU") [Member] | Osisko Development Corp [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Weighted average value of restricted share units granted | $ / shares |  | $ 7.02 |  |
Restricted share units ("RSU") [Member] | Officers [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of restricted stock units granted | shares |  |  |  | 150,000
Weighted average value of restricted share units granted | $ / shares |  |  |  | $ 12.70
Vesting period |  |  |  | 3 years
Additional number of restricted stock units granted | shares | 75,000 |  |  |
Weighted average value of restricted share units granted | $ / shares | $ 12.70 |  |  |
Common shares acquired by an officer | shares |  |  |  | 75,000
Common shares issued to the officer after income tax deduction | shares |  |  |  | 34,852
DSU and RSU [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share-based compensation |  | $ 4,700,000 | $ 6,800,000 |
Share-based compensation capitalized |  |  | 600,000 |
Closing price of the common shares |  | $ 15.48 |  |
Marginal income tax rate |  | 53.30% |  |
Employees tax obligations settlement amount related to vested RSU and DSU |  | $ 2,600,000 | 2,700,000 |
Employees tax obligations settlement amount related to outstanding RSU and DSU |  | 10,400,000 | 14,200,000 |
DSU and RSU [Member] | Osisko Development Corp [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share-based compensation |  | 3,300,000 |  |
Share-based compensation capitalized |  | 1,300,000 |  |
Closing price of the common shares |  | $ 4.06 |  |
Marginal income tax rate |  | 53.30% |  |
Employees tax obligations settlement amount related to vested RSU and DSU |  |  |  |
Employees tax obligations settlement amount related to outstanding RSU and DSU |  | $ 2,800,000 | $ 700,000 |

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