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STOCK-BASED COMPENSATION - Activity of Non-Option Awards (Details) - LTIP
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
RSUs and DSUs  
Stock Units  
Non-vested, beginning of year (in shares) | shares 815,062
Granted (in shares) | shares 388,937
Vested (in shares) | shares (444,556)
Forfeited (in shares) | shares (9,745)
Non-vested, end of year (in shares) | shares 749,698
Weighted-Average Grant-Date Fair Value  
Non-vested, beginning of year (in dollars per share) | $ / shares $ 42.18
Granted (in dollars per share) | $ / shares 45.92
Vested (in dollars per share) | $ / shares 48.25
Forfeited (in dollars per share) | $ / shares 40.71
Non-vested, end of year (in dollars per share) | $ / shares $ 40.54
PSUs  
Stock Units  
Non-vested, beginning of year (in shares) | shares 319,367
Granted (in shares) | shares 129,676
Vested (in shares) | shares (91,523)
Expired (in shares) | shares (41,955)
Non-vested, end of year (in shares) | shares 315,565
Weighted-Average Grant-Date Fair Value  
Non-vested, beginning of year (in dollars per share) | $ / shares $ 57.58
Granted (in dollars per share) | $ / shares 56.43
Vested (in dollars per share) | $ / shares 32.49
Expired (in dollars per share) | $ / shares 22.77
Non-vested, end of year (in dollars per share) | $ / shares $ 69.01
Target amount multiplier 1
PSUs | Minimum  
Weighted-Average Grant-Date Fair Value  
Ratio at which award holders get common stock of the company 0
PSUs | Maximum  
Weighted-Average Grant-Date Fair Value  
Ratio at which award holders get common stock of the company 2