Earnings Per Share (Tables)

9 Months Ended

Sep. 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				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Numerator:
Net income	$	29.2	$	4.1	$	76.7	$	19.0
Denominator — Weighted-average common shares outstanding (in thousands)1:
Basic	19,154		18,999		19,104		18,971
Diluted	19,288		19,197		19,240		19,171
Earnings per common share, Basic:
Net income per share	$	1.52	$	0.21	$	4.01	$	1.00
Earnings per common share, Diluted:
Net income per share	$	1.51	$	0.21	$	3.98	$	0.99

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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.