SHARE-BASED COMPENSATION (Details) - Time Based And Performance Based Shares - Employee - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based compensation
Shares granted	3,300
Weighted average grant date fair value (in dollars per share)	$ 37.78
Total stock-based compensation cost	$ 2.0	$ 1.9	$ 9.6	$ 5.6
Total unrecognized compensation cost	$ 11.1		$ 11.1
Unrecognized compensation cost over weighted-average period to be recognized			1 year 9 months 29 days