STOCK-BASED COMPENSATION PLANS - Summary of SAR Activity (Details) - SARs	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Stock Grants and SARs
Outstanding at the beginning of the year (in shares) | shares	2,610,000
Granted (in shares) | shares	450,000
Outstanding at the end of the year (in shares) | shares	3,060,000
Weighted-Average Price
Outstanding at the beginning of the year (in dollars per share) | $ / shares	$ 22.65
Granted (in dollars per share) | $ / shares	33.80
Outstanding at the end of the year (in dollars per share) | $ / shares	$ 24.29