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STOCK OPTION AND STOCK UNIT PLANS - Schedule of Weighted Average Assumptions Used to Determine the Fair Value of Stock Options Granted (Details) - Incentive Stock Options | 12 Months Ended |  |  |
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Dec. 31, 2024 $ / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 $ / shares | Dec. 31, 2024 $ / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 $ / shares
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Fair value per option (in Canadian dollars per share) | $ 4.07 | $ 6.05 | $ 5.07 |  |  |
Expected option term (in years) | 6 years | 6 years | 6 years |  |  |
Expected volatility (as a percent) | 21.10% | 22.20% | 21.90% |  |  |
Expected dividend yield (as a percent) | 8.10% | 6.70% | 6.50% |  |  |
Risk-free interest rate (as a percent) | 3.80% | 3.50% | 1.80% |  |  |
Expected option term - historical exercise practice (in years) | 6 years |  |  |  |  |
Canadian Employees |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Fair value per option (in Canadian dollars per share) | $ 3.53 | $ 5.38 | $ 4.78 |  |  |
United States Employees |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Fair value per option (in Canadian dollars per share) |  |  |  | $ 3.58 | $ 5.23 | $ 4.62
Retirement-Eligible Employees |  |  |  |  |  |
Weighted average assumptions used to determine the fair value of options |  |  |  |  |  |
Expected option term (in years) | 5 years |  |  |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Historical Exercise Practice + References No definition available. + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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