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STOCK-BASED COMPENSATION - Activity of Non-Option Awards (Details) - LTIP
 6 Months Ended
Jun. 30, 2022
$ / shares
shares
RSUs and DSUs  
Stock Units  
Non-vested, beginning of year (in shares) | shares 815,062
Granted (in shares) | shares 492,002
Vested (in shares) | shares (574,865)
Forfeited (in shares) | shares (30,399)
Non-vested, end of year (in shares) | shares 701,800
Weighted-Average Grant-Date Fair Value  
Non-vested, beginning of year (in dollars per share) | $ / shares $ 42.18
Granted (in dollars per share) | $ / shares 50.24
Vested (in dollars per share) | $ / shares 42.80
Forfeited (in dollars per share) | $ / shares 41.15
Non-vested, end of year (in dollars per share) | $ / shares $ 47.36
PSUs  
Stock Units  
Non-vested, beginning of year (in shares) | shares 319,367
Granted (in shares) | shares 199,317
Vested (in shares) | shares (91,523)
Expired (in shares) | shares (41,955)
Non-vested, end of year (in shares) | shares 385,206
Weighted-Average Grant-Date Fair Value  
Non-vested, beginning of year (in dollars per share) | $ / shares $ 57.58
Granted (in dollars per share) | $ / shares 64.23
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 $ 70.77
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