Earnings per Common Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings per Common Share

7. Earnings per Common Share

The computation of basic earnings per common share for the periods presented is based upon the weighted average number of common shares outstanding during the periods. The computation of diluted earnings per common share includes the effect of non-vested nonqualified stock options and restricted stock units assuming such options and stock units were outstanding common shares at the beginning of the period. The effect of antidilutive securities is excluded from the computation of diluted loss per common share, if any.

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended March 31,
	2021			2020
(Dollars in millions, except share amounts, in thousands)
Net income (loss) attributable to Koppers	$	25.9		$	(1.4	)
Less: Loss from discontinued operations, net of tax		(0.4	)		(4.4	)
Plus: Loss from noncontrolling interests		(0.1	)		(1.1	)
Income from continuing operations attributable to Koppers	$	26.2		$	1.9
Weighted average common shares outstanding:
Basic		21,142			20,852
Effect of dilutive securities		765			463
Diluted		21,907			21,315
Earnings per common share – continuing operations:
Basic earnings per common share	$	1.24		$	0.09
Diluted earnings per common share		1.20			0.09
Other data:
Antidilutive securities excluded from computation of    diluted earnings per common share		445			682