Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Components of Basic and Diluted Earnings Per Share

The components of basic and diluted earnings per share are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
In millions, except per share amounts	2021		2020		2021		2020
Net income (loss) attributable to common stockholders	$	17	$	(1)	$	114	$	124
Weighted average outstanding shares of common stock	108.9		109.1		108.9		109.3
Dilutive effect of employee stock options, restricted stock and other stock awards	4.5		—		4.2		1.6
Common stock and common stock equivalents	113.4		109.1		113.1		110.9
Net income (loss) per share:
Basic	$	0.16	$	(0.01)	$	1.05	$	1.13
Diluted	$	0.15	$	(0.01)	$	1.01	$	1.12