EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 390.7	$ (736.8)	$ 990.1	$ (936.9)
Basic shares	160.1	157.9	159.4	157.8
Basic net income (loss) per share	$ 2.44	$ (4.67)	$ 6.21	$ (5.94)
Earnings Per Share, Diluted [Abstract]
Basic shares	160.1	157.9	159.4	157.8
Stock-based compensation	3.8	0.0	3.6	0.0
Diluted shares	163.9	157.9	163.0	157.8
Diluted net income (loss) per share	$ 2.38	$ (4.67)	$ 6.07	$ (5.94)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Shares	0.1	10.3	0.1	10.3