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SHARE-BASED COMPENSATION PLANS (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Options
Assumptions used for estimating the fair value of share options
Risk-free interest rate (as a percent)		0.60%	1.90%	2.70%
Expected dividend yield (as a percent)		3.80%	3.90%	3.90%
Volatility (as a percent)		25.00%	20.00%	32.00%
Weighted average expected life of the options		6 years	6 years	6 years
Weighted average grant date fair value of options granted per share (in dollars per share)		$ 4.62	$ 3.66	$ 6.35
Term		10 years	10 years	10 years
Share options, additional general disclosures
Compensation expense recognized (in dollars)		$ 2,300,000	$ 2,000,000.0	$ 1,800,000
Vesting period		3 years
Unrecognized compensation cost		$ 2,500,000
Unrecognized compensation cost recorded, period		1 year 8 months 12 days
Number of Shares Under Option
Balance at the beginning of the period (in shares)		2,118,090
Options granted (in shares)		592,456
Options canceled (in shares)		(27,743)
Options exercised (in shares)		(418,999)
Balance at the end of the period (in shares)		2,263,804	2,118,090
Vested or expected to vest at the end of the period (in shares)		2,263,804
Exercisable at the end of the period (in shares)		1,202,882
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)		$ 26.37
Options granted (in dollars per share)		33.70
Options canceled (in dollars per share)		32.33
Options exercised (in dollars per share)		18.77
Balance at the end of the period (in dollars per share)		29.63	$ 26.37
Vested or expected to vest at the end of the period (in dollars per share)		29.63
Exercisable at the end of the period (in dollars per share)		$ 27.17
Weighted Average Remaining Contractual Term
Balance at the end of the period		6 years 9 months 25 days	6 years 4 months 20 days
Options granted		9 years 3 days
Options canceled		0 years
Options exercised		3 years 29 days
Vested or expected to vest at the end of the period		6 years 9 months 25 days
Exercisable at the end of the period		5 years 4 months 13 days
Aggregate intrinsic value
Options, exercisable (in dollars)		$ 35,800,000
Options, vested or expected to vest and exercisable (in dollars)		61,800,000
Options exercised (in dollars)		$ 10,600,000	$ 900,000	$ 9,100,000
Restricted Shares | Minimum
Share options, additional general disclosures
Vesting period		3 years
Restricted Shares | Maximum
Share options, additional general disclosures
Vesting period		5 years
Performance Shares
Assumptions used for estimating the fair value of share options
Term		3 years
Restricted Stock and Performance Shares
Assumptions used for estimating the fair value of share options
Risk-free interest rate (as a percent)		0.20%	1.70%	2.60%
Volatility (as a percent)		28.00%	19.00%	23.00%
Share options, additional general disclosures
Compensation expense recognized (in dollars)		$ 5,800,000	$ 5,200,000	$ 4,900,000
Unrecognized compensation cost		$ 6,700,000
Unrecognized compensation cost recorded, period		2 years
Number of Non-Vested Restricted Shares
Non-vested at the beginning of the period (in shares)		382,901
Granted (in shares)		176,825
Vested (in shares)		(160,549)
Forfeited (in shares)		(11,476)
Non-vested at the end of the period (in shares)		387,701	382,901
Restricted Shares & Performance Units
Weighted average fair value of restricted shares and performance units granted		$ 39.37	$ 32.39	$ 32.22
Total fair value of restricted shares and performance units vested		$ 7.0	$ 6.1	$ 5.8
Plan
SHARE-BASED COMPENSATION PLANS
Additional shares authorized	4,500,000
Shares reserved for future issuance	991,117
Shares available for future awards		2,448,384
Percentage of shares that may not be subject to specific limitations		5.00%
Maximum term of options		10 years
Plan | Minimum
Share options, additional general disclosures
Vesting period		1 year
Plan | Share Options
Number of Shares Under Option
Balance at the end of the period (in shares)		2,263,804
Plan | Restricted Shares
Number of Non-Vested Restricted Shares
Non-vested at the end of the period (in shares)		387,701

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