SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock options
Option Exercises
Options exercised during period (in shares)	50,159	154,789	863,511	569,288
Net proceeds from options exercised during the period	$ 0.3	$ 1.6	$ 6.3	$ 5.0
Restricted stock units
Restricted Stock Units
Number of shares issued due to vesting (in shares)	0	0	42,068	42,697