Earnings Per Share

12 Months Ended

Dec. 31, 2015

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:


	2015		2014		2013
Numerator (in millions):
Net income available to common stockholders	$	119.5	$	84.1	$	77.8

Denominator (in thousands):
Weighted average common shares outstanding		24,107		24,391		23,651
Dilutive effect of stock options and awards		505		487		505

Denominator for diluted earnings per share		24,612		24,878		24,156

Net income per share, basic:	$	4.96	$	3.45	$	3.29

Net income per share, diluted:	$	4.86	$	3.38	$	3.22

In 2015, 2014 and 2013 the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 0, 36,775 and 0 respectively.