Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

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 allocated to those securities (in millions).

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Earnings allocated to participating shareholders	$	0.2	$	0.2	$	0.2	$	0.1
Number of participating securities		1.0		1.2		1.1		1.3

Summary of Diluted Earning Per Share

The following table presents the number of common shares used in the calculation of net income per share from continuing operations (in millions).

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Weighted-average number of common shares-basic		24.1		23.6		24.0		23.4
Dilutive potential common shares		—		—		—		0.1
Weighted-average number of common shares-dilutive		24.1		23.6		24.0		23.5