EARNINGS (LOSS) PER SHARE

A computation of earnings (loss) per share and weighted average shares of the Company's common stock outstanding for the three and six months ended June 30, 2018 and 2017 follows:



	Three Months Ended June 30,						Six Months Ended June 30,
(amounts in millions, except per share amounts)	2018			2017			2018		2017
Net income (loss) attributable to common stockholders	$	12.0		$	(61.1	)	$	49.3	$	(85.5	)
Numerator adjustments for diluted EPS:
Income allocated to PDH non-controlling interest	(0.6		)	—			0.6		—
Remeasurement of contingent consideration	—			—			0.1		—
Numerator adjustments for diluted EPS:	(0.6		)	—			0.7		—
Net income (loss) attributable to common stockholders for diluted EPS	$	11.4		$	(61.1	)	$	50.0	$	(85.5	)

Basic weighted average common shares outstanding	288.2			286.1			288.0		285.3
Denominator adjustments for diluted EPS:
Number of shares issuable upon conversion of founder preferred stock	2.0			—			2.0		—
Number of shares contingently issuable for the contingent consideration	3.0			—			3.0		—
Number of shares issuable upon conversion of the PDH non-controlling interest	4.1			—			4.2		—
Number of stock options, RSUs and shares issued through employee stock purchase plan	0.7			—			0.7		—
Denominator adjustments for diluted EPS:	9.8			—			9.9		—
Dilutive weighted average common shares outstanding	298.0			286.1			297.9		285.3

Earnings (loss) per share attributable to common stockholders:
Basic	$	0.04		$	(0.21	)	$	0.17	$	(0.30	)
Diluted	$	0.04		$	(0.21	)	$	0.17	$	(0.30	)

Dividends per share paid to common stockholders	$	—		$	—		$	—	$	—

For the three and six months ended June 30, 2018 and 2017, the following securities were not included in the computation of diluted shares outstanding because the effect would be anti-dilutive or because performance targets were not yet achieved for awards contingent upon performance:



	Three Months Ended June 30,		Six Months Ended June 30,
(amounts in millions)	2018	2017	2018	2017
Shares issuable upon conversion of PDH Common Stock	—	6.0	—	6.8
Shares issuable upon conversion of Series A Preferred Stock	—	2.0	—	2.0
Shares issuable for the contingent consideration	4.4	6.3	5.0	6.2
Shares issuable upon vesting and exercise of stock options	—	0.1	—	0.1
Shares issuable upon vesting of RSUs	0.8	0.9	0.6	0.8
Total	5.2	15.3	5.6	15.9