Net Income (Loss) Per Common Share (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the computation of basic and diluted net income (loss) per share (in millions, except per share data):



	Three Months Ended September 30,					Nine Months Ended September 30,
	2018		2017			2018		2017
Net income (loss)	$	46.6	$	(2.0	)	$	52.6	$	(40.8	)
Net income (loss) per common share:
Basic	$	0.53	$	(0.02	)	$	0.60	$	(0.47	)
Diluted	$	0.52	$	(0.02	)	$	0.59	$	(0.47	)

Basic weighted average shares outstanding	88.5		86.7			88.0		86.1
Effect of potentially dilutive stock options	0.2		—			0.2		—
Effect of potentially dilutive share-based awards	1.6		—			1.1		—
Diluted weighted average shares outstanding	90.3		86.7			89.3		86.1

Historical Outstanding Anti-Dilutive Securities

Outstanding anti-dilutive securities not included in diluted net income (loss) per share attributable to common stockholders calculation (in millions):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Options outstanding to purchase common stock	—	0.4	—	0.4
Unvested restricted stock units	—	2.8	0.3	2.8
Senior convertible notes	4.0	4.0	4.0	4.0
Total	4.0	7.2	4.3	7.2