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Share-based payments - Stock Options Exercise Prices and Weighted Average Remaining Life (Details) | Dec. 31, 2022 year shares $ / shares | Dec. 31, 2021 year shares $ / shares | Dec. 31, 2020 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 | 7,802,108 | 10,778,724 | 15,650,234
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 5 | 6 |
Weighted average exercise price of share options outstanding (in cad per share) | $ 61 | $ 60 | $ 59
$50-$59 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 4,510,298 | 7,442,442 |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 4 | 4 |
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 | 3,291,810 | 3,336,282 |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 7 | 8 |
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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