EARNINGS (LOSS) PER COMMON SHARE - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - shares shares in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Weighted average common shares outstanding - basic (in shares)	91.6	91.3
Incremental shares outstanding related to stock-based awards (in shares)	0.4	0.0
Weighted average common shares outstanding - diluted (in shares)	92.0	91.3

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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