Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Calculation of basic and diluted earnings per share

Basic and diluted earnings per share were calculated as follows, for each period presented:

	Quarter Ended				Six Months Ended
	June 30,				2013
	2013		2012		2013		2012
Numerator:
Net income	$	18.6	$	21.0	$	52.1	$	47.5
Denominator — Weighted-average common shares outstanding (in thousands)1:
Basic	18,742		19,137		19,027		19,087
Add: dilutive effect of restricted stock, restricted stock units and performance shares	112		63		135		83
Add: dilutive effect of warrants	91		—		94		—
Diluted	18,945		19,200		19,256		19,170
Earnings per common share, Basic:
Net income per share	$	0.99	$	1.10	$	2.73	$	2.49
Earnings per common share, Diluted:
Net income per share	$	0.98	$	1.09	$	2.70	$	2.48

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¹  The basic weighted-average number of common shares outstanding during the period excludes unvested share-based payment awards. The diluted weighted-average number of common shares outstanding during the period is calculated using the treasury method.