SHARE-BASED COMPENSATION PLANS - Summary of outstanding and exercisable stock options (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options Outstanding | shares	1,176,770
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	4 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 27.14
Options Exercisable, Number Of Options Exercisable | shares	703,030
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 26.71
Exercise Price Range From $23.38 to $25.86 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower Range Limit (in dollars per share)	23.38
Exercise Prices, Upper Range Limit (in dollars per share)	$ 25.86
Options Outstanding, Number of Options Outstanding | shares	632,950
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	4 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 24.92
Options Exercisable, Number Of Options Exercisable | shares	381,925
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 25.59
Exercise Price Range From $27.04 to $37.22 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower Range Limit (in dollars per share)	27.04
Exercise Prices, Upper Range Limit (in dollars per share)	$ 37.22
Options Outstanding, Number of Options Outstanding | shares	543,820
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	5 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 29.72
Options Exercisable, Number Of Options Exercisable | shares	321,105
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 28.05