STOCK BASED COMPENSATION - Outstanding and Exercisable Options (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted average remaining contractual life of outstanding options	4 years 6 months 21 days	5 years 2 months 30 days	5 years 8 months 12 days
Total aggregate intrinsic value of outstanding options	$ 12.8	$ 25.1	$ 162.4
Weighted average remaining contractual life of exercisable options	3 years 10 months 14 days	4 years 4 months 24 days	4 years 8 months 12 days
Total aggregate intrinsic value of exercisable options	$ 12.8	$ 25.1	$ 130.6