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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
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