Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Summary of Earnings Per Share

Per share amounts are computed as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2017		2016		2017		2016
Numerator (in millions):
Net income available to common stockholders	$	23.3	$	11.4	$	66.6	$	59.2
Denominator (in thousands):
Weighted average common shares outstanding		24,137		23,977		24,119		23,989
Dilutive effect of stock options and awards		428		499		450		473
Denominator for diluted earnings per share		24,565		24,476		24,569		24,462
Net income per share, basic:	$	0.97	$	0.48	$	2.76	$	2.47
Net income per share, diluted:	$	0.95	$	0.47	$	2.71	$	2.42