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Share-based payments - Stock Options Exercise Prices and Weighted Average Remaining Life (Details) | Dec. 31, 2024 shares year $ / shares | Dec. 31, 2023 shares year $ / shares | Dec. 31, 2022 shares $ / shares
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Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 6,545,819 | 7,484,561 | 7,802,108
Weighted average remaining life (years) | year | 4 | 4 |
Weighted average exercise price of share options outstanding (in cad per share) | $ 61 | $ 61 | $ 61
$50-$59 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 3,390,928 | 4,291,180 |
Weighted average remaining life (years) | year | 3 | 3 |
Weighted average exercise price of share options outstanding (in cad per share) | $ 58 | $ 58 |
$50-$59 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options (in cad per share) | 50 |  |
$50-$59 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options (in cad per share) | $ 59 |  |
$60 & above |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 3,154,891 | 3,193,381 |
Weighted average remaining life (years) | year | 5 | 6 |
Weighted average exercise price of share options outstanding (in cad per share) | $ 65 | $ 65 |
$60 & above | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options (in cad per share) | $ 60 |  |

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