Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

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				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Numerator:
Net income	$	4.4	$	5.5	$	20.2	$	14.4
Less: Net income attributable to participating securities1	—		—		—		(0.1		)
Net income available to common stockholders	$	4.4	$	5.5	$	20.2	$	14.3
Denominator — Weighted-average common shares outstanding (000):
Basic	18,999		18,941		18,971		19,499
Diluted	18,999		18,941		18,971		19,499
Earnings per common share:
Basic	$	0.23	$	0.29	$	1.06	$	0.74
Diluted	$	0.23	$	0.29	$	1.06	$	0.74

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¹  Net income attributable to participating securities for a given period includes both distributed and undistributed net income, as applicable. Distributed net income attributed to participating securities represents dividend and dividend equivalents declared on the participating securities that the Company expects to ultimately vest. Undistributed net income for a given period, if any, is apportioned to common stockholders and participating securities based on the weighted- average number of securities outstanding in each class during the applicable period as a percentage of the combined weighted-average number of these securities outstanding during the period. Undistributed losses are not allocated to participating securities, however, as the holders of such securities do not have an obligation to fund net losses of the Company.