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STOCK-BASED COMPENSATION - Stock options (Details) - Employee stock options |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 24, 2001 | Dec. 31, 2023 CAD ($) Options $ / shares shares | Dec. 31, 2022 CAD ($) Options $ / shares | Dec. 31, 2021 shares
Share based compensation |  |  |  |
Number of common shares that reserved for issuance to any one person under ESOP (in percentage) |  | 5.00% |  |
Number of common shares reserved for issuance | shares |  |  |  | 38,700,000
Vesting period |  | 3 years |  |
Number of stock options |  |  |  |
Outstanding, beginning of year | Options |  | 4,976,636 | 4,482,941 |
Granted during the year | Options |  | 873,950 | 1,643,801 |
Exercised during the year | Options |  | (940,921) | (944,989) |
Forfeited during the year | Options |  | (240,603) | (205,117) |
Expired during the year | Options |  | (22,650) |  |
Outstanding, end of year | Options |  | 4,646,412 | 4,976,636 |
Options exercisable, end of year | Options |  | 2,950,555 | 2,706,334 |
Weighted average exercise price |  |  |  |
Options outstanding, beginning of year | $ / shares |  | $ 75.04 | $ 74.43 |
Granted during the year | $ / shares |  | 70.36 | 67.10 |
Exercised during the year | $ / shares |  | 57.68 | 57.68 |
Forfeited during the year | $ / shares |  | 78.03 | 78.08 |
Expired during the year | $ / shares |  | 71.95 |  |
Options outstanding, end of year | $ / shares |  | 77.54 | 75.04 |
Options exercisable, end of year | $ / shares |  | 80.18 | 73.76 |
Average share price of common shares | $ / shares |  | $ 68.94 | $ 64.87 |
Weighted average grant date fair value of stock options granted | $ |  | $ 17.00 | $ 11.09 |
Maximum |  |  |  |
Share based compensation |  |  |  |
Option term (expiration period) | 5 years |  |  |
Subsequent events |  |  |  |
Share based compensation |  |  |  |
Number of stock options vested within 30 days of grant date | shares |  | 255,350 |  |
Vesting period |  | 3 years |  |
Number of stock options |  |  |  |
Granted during the year | Options |  | 1,021,400 |  |

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