Earnings per Share

12 Months Ended

Dec. 31, 2018

Note 5. Earnings per Share

Basic earnings per share is based on the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period. Per share amounts are computed as follows:


	2018		2017		2016
Numerator (in millions):
Net income available to common stockholders	$	85.0	$	61.8	$	81.3

Denominator (in thousands):
Weighted average common shares outstanding		24,401		24,148		23,998
Dilutive effect of stock options and awards		202		338		444

Denominator for diluted earnings per share		24,603		24,486		24,442

Net income per share, basic:	$	3.48	$	2.56	$	3.39

Net income per share, diluted:	$	3.45	$	2.52	$	3.33

In 2018, 2017 and 2016 the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 0, 9,422 and 0 respectively.