EQUITY - TOTAL STOCK BASED COMPENSATION EXPENSE AND THE TAX RELATED BENEFIT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Stock option expense	$ 15.4	$ 10.6	$ 8.1
RSU expense	31.2	29.1	16.2
Total stock based compensation expense	46.6	39.7	24.3
Related deferred income tax benefit	$ 8.4	$ 10.9	$ 7.1