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STOCK-BASED COMPENSATION - Restricted and Deferred Share Unit Activity (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restricted share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Outstanding, beginning of year (in shares) 2,218,925 1,811,845
Granted and reinvested dividends (in shares) 1,013,900 1,217,487
Exercised (in shares) (582,314) (597,015)
Forfeited (in shares) (177,737) (213,392)
Outstanding, end of year (in shares) 2,472,774 2,218,925
Deferred share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Outstanding, beginning of year (in shares) 2,004,440 2,327,647
Granted and reinvested dividends (in shares) 110,003 131,051
Exercised (in shares) (348,285) (334,930)
Forfeited (in shares) (24,274) (119,328)
Outstanding, end of year (in shares) 1,741,884 2,004,440