EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share Table

	Years ended December 31,
	2017		2016			2015
Computation of Income (Loss) per Share	(In millions, except per share data)
Net income (loss)	$	549.5	$	(3.9	)	$	(1.4	)
Basic shares	166.2		165.2			103.4
Basic net income (loss) per share	$	3.31	$	(0.02	)	$	(0.01	)
Diluted shares:
Basic shares	166.2		165.2			103.4
Stock-based compensation	2.3		—			—
Diluted shares	168.5		165.2			103.4
Diluted net income (loss) per share	$	3.26	$	(0.02	)	$	(0.01	)