EARNINGS (LOSS) PER COMMON SHARE (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2021	2020
Weighted average common shares outstanding - basic	91.6	91.3
Incremental shares outstanding related to stock-based awards	0.4	—
Weighted average common shares outstanding - diluted	92.0	91.3

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

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

In thousands
	Three Months Ended March 31,
	2021	2020
Options excluded from computation of diluted earnings (loss) per share	2,372	3,644
RSUs excluded from computation of diluted earnings (loss) per share	30	183