EARNINGS (LOSS) PER COMMON SHARE

12 Months Ended

Dec. 31, 2022

Basic earnings (loss) per share is computed by dividing Net income (loss) by the number of weighted average common shares outstanding during the reporting period. Diluted earnings per share is calculated to give effect to all potentially dilutive common shares that were outstanding during the reporting period, only in the periods in which such effect is dilutive.

The following table shows the effect of stock-based awards on the weighted average number of shares outstanding used in calculating diluted earnings per share:


In millions, except per share data
	Year Ended December 31,
	2022	2021	2020




Weighted average common shares outstanding - basic	92.1	91.8	91.5

Incremental shares outstanding related to stock-based awards (1)	0.3	—	—
Weighted average common shares outstanding - diluted	92.4	91.8	91.5

(1)In periods of net loss, stock-based awards are anti-dilutive and therefore excluded from the earnings (loss) per share calculation.

Anti-dilutive stock-based awards excluded from the computation of diluted earnings (loss) per share using the treasury stock method includes the following:


In thousands
	Year Ended December 31,
	2022	2021	2020
Option awards	1,241	1,897	3,017
RSU awards	45	63	4

PSUs are offered to key employees and are subject to achievement of specified performance conditions. Contingently issuable shares are excluded from the computation of diluted earnings per share based on current period results. The shares would not be issuable if the end of the year were the end of the contingency period. If such goals are not met, no compensation expense is recognized, and any previously recognized compensation expense is reversed.