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v3.24.1

Share-based compensation plans (Share options number and weighted average price) (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2023 shares $ / shares | Dec. 31, 2023 CAD ($) shares $ / shares | Dec. 31, 2023 shares $ / shares | Dec. 31, 2023 shares $ / shares | Dec. 31, 2022 shares CAD ($) $ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares $ / shares
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |  |  |  |  |
Beginning of year | shares |  |  | 3,053,571 |  |  | 3,458,001 |  |
Options granted | shares |  |  | 0 |  |  | 0 |  |
Options expired | shares |  |  | 0 |  |  | (2,475) |  |
Options exercised |  | (1,657,282) | (1,657,282) |  | (401,955) | (401,955) |  |
End of year | shares |  |  | 1,396,289 |  |  | 3,053,571 |  |
Weighted average exercisable price - beginning of year |  |  |  | $ 15.75 |  |  | $ 16.72 |
Weighted average exercisable price for options granted |  |  |  | 0 |  |  | 0 |
Weighted average exercisable price for options expired |  |  |  | 0 |  |  | 26.81 |
Weighted average exercise price for options exercised |  |  |  | 16.62 |  |  | 23.96 |
Weighted average exercisable price - end of year |  |  |  | $ 14.73 |  |  | $ 15.75 |
Exercisable | shares | 1,396,289 | 1,396,289 | 1,396,289 | 1,396,289 | 3,053,571 | 3,053,571 | 3,053,571 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Number Of Outstanding Share Options | shares | 1,396,289 | 1,396,289 | 1,396,289 | 1,396,289 | 3,053,571 | 3,053,571 | 3,053,571 | 3,458,001
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ 14.73 | $ 14.73 | $ 14.73 | $ 14.73 | $ 15.75 | $ 15.75 | $ 15.75 | $ 16.72
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares | 1,396,289 | 1,396,289 | 1,396,289 | 1,396,289 | 3,053,571 | 3,053,571 | 3,053,571 |
Options exercisable - Weighted average exercisable price | $ 14.73 | $ 14.73 | $ 14.73 | $ 14.73 | $ 15.75 | $ 15.75 | $ 15.75 |
$11.32 - 14.70 [member] |  |  |  |  |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |  |  |  |  |
End of year | shares |  |  | 658,804 |  |  |  |  |
Weighted average exercisable price - end of year |  |  |  | $ 14.08 |  |  |  |
Exercisable | shares | 658,804 | 658,804 | 658,804 | 658,804 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Number Of Outstanding Share Options | shares | 658,804 | 658,804 | 658,804 | 658,804 |  |  |  |
Options outstanding - Weighted average remaining life | 1 year 3 months 18 days |  |  |  |  |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ 14.08 | $ 14.08 | $ 14.08 | $ 14.08 |  |  |  |
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares | 658,804 | 658,804 | 658,804 | 658,804 |  |  |  |
Options exercisable - Weighted average exercisable price | $ 14.08 | $ 14.08 | $ 14.08 | $ 14.08 |  |  |  |
$11.32 - 14.70 [member] | Bottom of range [Member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | 11.32 | 11.32 | 11.32 | 11.32 |  |  |  |
$11.32 - 14.70 [member] | Top of range [Member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | $ 14.7 | $ 14.7 | $ 14.7 | 14.7 |  |  |  |
$14.71 - 16.38 [member] |  |  |  |  |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |  |  |  |  |
End of year | shares |  |  | 737,485 |  |  |  |  |
Weighted average exercisable price - end of year |  |  |  | $ 15.32 |  |  |  |
Exercisable | shares | 737,485 | 737,485 | 737,485 | 737,485 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Number Of Outstanding Share Options | shares | 737,485 | 737,485 | 737,485 | 737,485 |  |  |  |
Options outstanding - Weighted average remaining life | 3 years |  |  |  |  |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ 15.32 | $ 15.32 | $ 15.32 | $ 15.32 |  |  |  |
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares | 737,485 | 737,485 | 737,485 | 737,485 |  |  |  |
Options exercisable - Weighted average exercisable price | $ 15.32 | $ 15.32 | $ 15.32 | $ 15.32 |  |  |  |
$14.71 - 16.38 [member] | Bottom of range [Member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | 14.71 | 14.71 | 14.71 | 14.71 |  |  |  |
$14.71 - 16.38 [member] | Top of range [Member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | $ 16.38 | $ 16.38 | $ 16.38 | $ 16.38 |  |  |  |

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