EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (120.1)	$ (80.0)	$ (20.0)	$ 41.7	$ (200.1)	$ 21.7
Basic shares	157.9		164.6		157.8	164.8
Basic net (loss) income per share	$ (0.76)		$ (0.12)		$ (1.27)	$ 0.13
Earnings Per Share, Diluted [Abstract]
Basic shares	157.9		164.6		157.8	164.8
Stock-based compensation	0.0		0.0		0.0	0.9
Diluted shares	157.9		164.6		157.8	165.7
Diluted net (loss) income per share	$ (0.76)		$ (0.12)		$ (1.27)	$ 0.13
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10.3		8.0		10.3	5.5