STOCK-BASED COMPENSATION – RESTRICTED SHARE UNITS (Details) (Restricted Share Units, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Restricted Share Units
Restricted Share Unit Awards
Outstanding at the beginning of the period (in shares)	67,741
Granted (in shares)	28,725
Dividend equivalents (in shares)	807
Vested and released (in shares)	(28,194)
Forfeited (in shares)	(92)
Outstanding at the end of the period (in shares)	68,987
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 52.06
Granted (in dollars per share)	$ 55.23	$ 56.00
Dividend equivalents (in dollars per shares)	$ 54.46
Vested and released (in dollars per shares)	$ 49.46
Forfeited (in dollars per share)	$ 56.00
Outstanding at the end of the period (in dollars per share)	$ 54.46
Additional Disclosures
Total intrinsic value of restricted share units vested and released	$ 1.5	$ 1.6
Compensation cost not yet recognized	$ 2.3
Weighted-average period over which compensation cost is to be recognized	2 years 6 months