Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2018

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				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Earnings allocated to participating shareholders	$	—	$	—	$	—	$	0.1
Number of participating securities		0.9		1.1		1.0		1.2

Summary of Diluted Earning Per Share

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Weighted-average number of common shares-basic		25.1		24.9		25.1		24.8
Dilutive potential common shares		—		—		—		—
Weighted-average number of common shares-dilutive		25.1		24.9		25.1		24.8