Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Summary of number of participating securities and earning allocations to those securities

The following table presents the number of participating securities and earnings allocation to those securities.

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Earnings allocated to participating shareholders	$	0.2	$	0.2	$	0.1		NA
Number of participating securities		1.7		2.2		1.7		NA

Summary of Diluted Earning Per Share

The diluted earnings per share calculations include the effect of the assumed exercise using the treasury stock method for both stock options and unvested restricted stock units, except when the effect would be anti-dilutive. The following table presents the number of common shares used in the calculation of net income per share from continuing operations for the three- and six-month periods ended June 30, 2013 ended June 30, 2012.

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Weighted-average number of common shares-basic		22.8		23.0		22.7		22.8
Dilutive potential common shares		0.1		—		—		—
Weighted-average number of common shares-dilutive		22.9		23.0		22.7		22.8