STOCK-BASED COMPENSATION PLANS, Activity in Long-Term Incentive Program (Details) - Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	1,708,296	1,755,992
Granted (in shares)	213,504	197,943
Exercised (in shares)	(268,004)	(238,499)
Forfeited (in shares)	(9,435)	(7,140)
Outstanding, end of period (in shares)	1,644,361	1,708,296
Exercisable, end of period (in shares)	1,010,795
Weighted-average exercise price of shares [Abstract]
Outstanding, beginning of period (in dollars per share)	$ 34.57	$ 30.85
Granted (in dollars per share)	55.92	57.02
Exercised (in dollars per share)	27.94	25.72
Forfeited (in dollars per share)	45.54	37.47
Outstanding, end of period (in dollars per share)	38.36	$ 34.57
Exercisable, end of period (in dollars per share)	$ 32.66