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v3.23.1

Share-based compensation plans (Share options number and weighted average price) (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2022 shares $ / shares | Dec. 31, 2022 shares CAD ($) $ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2022 shares $ / shares | Dec. 31, 2021 shares CAD ($) $ / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |  |  |  |  |
Beginning of year | shares |  |  | 3,458,001 |  |  | 6,158,539 |  |
Options granted | shares |  |  | 0 |  |  | 0 |  |
Options forfeited | shares |  |  | 0 |  |  | (18,005) |  |
Options expired | shares |  |  | (2,475) |  |  | (886,009) |  |
Options exercised |  | (401,955) | (401,955) |  | (1,796,524) | (1,796,524) |  |
End of year | shares |  |  | 3,053,571 |  |  | 3,458,001 |  |
Weighted average exercisable price - beginning of year |  |  |  | $ 16.72 |  |  | $ 16.98 |
Weighted average exercisable price for options granted |  |  |  | 0 |  |  | 0 |
Weighted average exercisable price for options forfeited |  |  |  | 0 |  |  | 26.08 |
Weighted average exercisable price for options expired |  |  |  | 26.81 |  |  | 22.05 |
Weighted average exercise price for options exercised |  |  |  | 23.96 |  |  | 14.90 |
Weighted average exercisable price - end of year |  |  |  | $ 15.75 |  |  | $ 16.72 |
Exercisable | shares | 3,053,571 | 3,053,571 | 3,053,571 | 3,053,571 | 3,162,415 | 3,162,415 | 3,162,415 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Number Of Outstanding Share Options | shares | 3,053,571 | 3,053,571 | 3,053,571 | 3,053,571 | 3,458,001 | 3,458,001 | 3,458,001 | 6,158,539
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ 15.75 | $ 15.75 | $ 15.75 | $ 15.75 | $ 16.72 | $ 16.72 | $ 16.72 | $ 16.98
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares | 3,053,571 | 3,053,571 | 3,053,571 | 3,053,571 | 3,162,415 | 3,162,415 | 3,162,415 |
Options exercisable - Weighted average exercisable price | $ 15.75 | $ 15.75 | $ 15.75 | $ 15.75 | $ 16.85 | $ 16.85 | $ 16.85 |
$11.32 - 15.83 [member] |  |  |  |  |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |  |  |  |  |
End of year | shares |  |  | 1,772,271 |  |  |  |  |
Weighted average exercisable price - end of year |  |  |  | $ 14.57 |  |  |  |
Exercisable | shares | 1,772,271 | 1,772,271 | 1,772,271 | 1,772,271 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Number Of Outstanding Share Options | shares | 1,772,271 | 1,772,271 | 1,772,271 | 1,772,271 |  |  |  |
Options outstanding - Weighted average remaining life | 3 years 2 months 12 days |  |  |  |  |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ 14.57 | $ 14.57 | $ 14.57 | $ 14.57 |  |  |  |
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares | 1,772,271 | 1,772,271 | 1,772,271 | 1,772,271 |  |  |  |
Options exercisable - Weighted average exercisable price | $ 14.57 | $ 14.57 | $ 14.57 | $ 14.57 |  |  |  |
$11.32 - 15.83 [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 - 15.83 [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | $ 15.83 | $ 15.83 | $ 15.83 | 15.83 |  |  |  |
$15.84 - 19.30 [member] |  |  |  |  |  |  |  |
Number And Weighted Average Exercise Prices Of Share Options [Abstract] |  |  |  |  |  |  |  |
End of year | shares |  |  | 1,281,300 |  |  |  |  |
Weighted average exercisable price - end of year |  |  |  | $ 17.39 |  |  |  |
Exercisable | shares | 1,281,300 | 1,281,300 | 1,281,300 | 1,281,300 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Number Of Outstanding Share Options | shares | 1,281,300 | 1,281,300 | 1,281,300 | 1,281,300 |  |  |  |
Options outstanding - Weighted average remaining life | 9 months 18 days |  |  |  |  |  |  |
Weighted Average Exercise Price Of Share Options Outstanding In Sharebased Payment Arrangement | $ 17.39 | $ 17.39 | $ 17.39 | $ 17.39 |  |  |  |
Number Of Share Options Exercisable In Sharebased Payment Arrangement | shares | 1,281,300 | 1,281,300 | 1,281,300 | 1,281,300 |  |  |  |
Options exercisable - Weighted average exercisable price | $ 17.39 | $ 17.39 | $ 17.39 | $ 17.39 |  |  |  |
$15.84 - 19.30 [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | 15.84 | 15.84 | 15.84 | 15.84 |  |  |  |
$15.84 - 19.30 [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |  |
Option price per share | $ 19.3 | $ 19.3 | $ 19.3 | $ 19.3 |  |  |  |

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