Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

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,				June 30,
	2012		2011		2012		2011
Numerator:
Net income	$	21.0	$	4.1	$	47.5	$	14.9
Denominator — Weighted-average common shares outstanding (in thousands)1:
Basic	19,137		18,984		19,087		18,962
Diluted	19,200		19,176		19,170		19,164
Earnings per common share, Basic:
Net income per share	$	1.10	$	0.22	$	2.49	$	0.79
Earnings per common share, Diluted:
Net income per share	$	1.09	$	0.21	$	2.48	$	0.78

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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.