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 under the treasury stock method. Per share amounts are computed as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2025		2024		2025		2024
Numerator (in millions):
Net income available to common stockholders	$	23.5	$	31.2	$	56.3	$	72.6
Denominator (in thousands):
Weighted average common shares outstanding		24,937		24,937		24,954		24,918
Dilutive effect of stock options and awards		105		160		143		173
Denominator for diluted earnings per share		25,042		25,097		25,097		25,091
Net income per share, basic:	$	0.94	$	1.25	$	2.26	$	2.91
Net income per share, diluted:	$	0.94	$	1.24	$	2.24	$	2.89

In the three and six months ended June 30, 2025, the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 59,418 and 23,283 (three and six months ended June 30, 2024– 10,436 and 10,483).