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Share-based compensation (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022 CAD ($) Month shares $ / shares | Dec. 31, 2021 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 | $ 16.26 | $ 16.04 |
Share-based compensation related to share options | $ | $ 2,700,000 | $ 3,000,000 |
Number of share options granted | shares | 684,100 | 763,700 |
Weighted average exercise price of share options granted | $ 14.25 | $ 13.27 |
Expected life | Month | 47 | 46 |
Deferred share units [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average value of deferred share units granted | $ 14.71 | $ 15.54 |
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 | $ 14.26 | $ 13.24 |
Number of restricted stock units forfeited | shares |  | 215,812 |
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 |  |  | $ 12.7
Vesting period |  |  | 3 years
Additional number of restricted stock units granted | shares |  | 75,000 |
Weighted average value of restricted share units granted |  | $ 12.7 |
Common shares acquired by an officer | shares |  |  | 75,000
DSU and RSU [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share-based compensation | $ | $ 4,500,000 | $ 4,700,000 |
Closing price of the common shares | $ | $ 16.32 |  |
Marginal income tax rate | 53.30% |  |
Employees tax obligations settlement amount related to vested RSU and DSU | $ | $ 3,100,000 | 2,600,000 |
Employees tax obligations settlement amount related to outstanding RSU and DSU | $ | $ 11,200,000 | $ 10,400,000 |

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