EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 20.9	$ 13.4
Basic shares	167.2	165.6
Basic net income per share	$ 0.13	$ 0.08
Earnings Per Share, Diluted [Abstract]
Basic shares	167.2	165.6
Stock-based compensation	2.0	2.3
Diluted shares	169.2	167.9
Diluted net income per share	$ 0.12	$ 0.08
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2.5	2.4