Earnings per Common Share

12 Months Ended

Dec. 31, 2019

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:

	Year Ended December 31,
	2019			2018		2017
(Dollars in millions, except share amounts, in thousands, and per share amounts)
Net income attributable to Koppers	$	66.6		$	23.4	$	29.1
(Loss) income from discontinued operations		(0.1	)		0.4		(0.8	)
Income from continuing operations attributable to Koppers	$	66.7		$	23.0	$	29.9
Weighted average common shares outstanding:
Basic		20,665			20,871		20,754
Effect of dilutive securities		403			455		1,246
Diluted		21,068			21,326		22,000
Earnings per common share – continuing operations:
Basic earnings per common share	$	3.23		$	1.10	$	1.44
Diluted earnings per common share		3.16			1.08		1.36
Other data:
Antidilutive securities excluded from computation of diluted earnings per common share		764			401		156