EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net (loss) income	$ (20.0)	$ 41.7	$ 58.6	$ 20.9	$ 21.7	$ 79.5
Basic shares	164.6		167.1		164.8	167.1
Basic net (loss) income per share	$ (0.12)		$ 0.35		$ 0.13	$ 0.48
Earnings Per Share, Diluted [Abstract]
Basic shares	164.6		167.1		164.8	167.1
Stock-based compensation	0.0		1.7		0.9	2.0
Diluted shares	164.6		168.8		165.7	169.1
Diluted net (loss) income per share	$ (0.12)		$ 0.35		$ 0.13	$ 0.47
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8.0		2.5		5.5	2.5