STOCK-BASED COMPENSATION PLANS - Summary of SAR Activity (Details) - SARs	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Stock Grants and SARs
Outstanding at the beginning of the year (in shares) | shares	2,080,032
Granted (in shares) | shares	1,763,828
Exercised (in shares) | shares	(638,298)
Outstanding at the end of the year (in shares) | shares	3,205,562
Weighted-Average Price
Outstanding at the beginning of the year (in dollars per share) | $ / shares	$ 20.14
Granted (in dollars per share) | $ / shares	28.83
Exercised (in dollars per share) | $ / shares	28.20
Outstanding at the end of the year (in dollars per share) | $ / shares	$ 23.32