EARNINGS PER SHARE

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

EARNINGS PER SHARE

NOTE 5. EARNINGS PER SHARE

Basic and diluted net (loss) income per share are computed by dividing net (loss) income by the weighted-average number of common shares outstanding.  Diluted net (loss) income per share reflects the dilutive effect of stock-based compensation.

	Years ended December 31,
	2020		2019		2018
Computation of Net (Loss) Income per Share	(In millions, except per share data)
Net (loss) income	$	(969.9)	$	(11.3)	$	327.9
Basic shares	157.9		162.3		166.8
Basic net (loss) income per share	$	(6.14)	$	(0.07)	$	1.97
Diluted shares:
Basic shares	157.9		162.3		166.8
Stock-based compensation	—		—		1.6
Diluted shares	157.9		162.3		168.4
Diluted net (loss) income per share	$	(6.14)	$	(0.07)	$	1.95

The computation of dilutive shares from stock-based compensation does not include 10.0 million, 7.8 million and 2.4 million shares in 2020, 2019 and 2018, respectively, as their effect would have been anti-dilutive.