(LOSS) EARNINGS PER COMMON SHARE (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings (Loss) Per Share

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 of shares
	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
Weighted average common shares outstanding - basic	91.9	91.5	91.8	91.4
Incremental shares outstanding related to stock-based awards (1)	—	—	—	—
Weighted average common shares outstanding - diluted	91.9	91.5	91.8	91.4

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

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

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

In thousands of shares
	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
Option awards	1,741	2,691	2,042	3,190
RSU awards	318	278	307	281