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STOCK OPTION AND STOCK UNIT PLANS - Weighted Average Assumptions (Details) - Incentive Stock Options
12 Months Ended
Dec. 31, 2023
$ / shares
Dec. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Dec. 31, 2023
$ / shares
Dec. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Weighted average assumptions used to determine the fair value of options            
Fair value per option (in Canadian dollars per share) $ 6.05 $ 5.07 $ 4.10      
Expected option term (in years) 6 years 6 years 6 years      
Expected volatility (as a percent) 22.20% 21.90% 25.50%      
Expected dividend yield (as a percent) 6.70% 6.50% 7.60%      
Risk-free interest rate (as a percent) 3.50% 1.80% 0.70%      
Expected option term - historical exercise practice 6 years          
Canadian Employees            
Weighted average assumptions used to determine the fair value of options            
Fair value per option (in Canadian dollars per share) $ 5.38 $ 4.78 $ 3.91      
United States Employees            
Weighted average assumptions used to determine the fair value of options            
Fair value per option (in Canadian dollars per share)       $ 5.23 $ 4.62 $ 3.65
Retirement-Eligible Employees            
Weighted average assumptions used to determine the fair value of options            
Expected option term (in years) 5 years