Basic and Diluted Net (Loss) Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

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 for the years ended December 31, 2017, 2016 and 2015 (in millions):

	2017		2016		2015
Earnings allocated to participating shareholders	$	-	$	0.5	$	1.2
Number of participating securities		1.1		1.0		1.0

Summary of Diluted Earning Per Share

The following table presents the number of common shares used in the calculation of net (loss) income per share from continuing operations for the years ended December 31, 2017, 2016 and 2015 (in millions):

	2017		2016		2015
Weighted-average number of common shares-basic		24.9		24.5		24.1
Dilutive potential common shares		—		—		—
Weighted-average number of common shares-    dilutive		24.9		24.5		24.1