Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Numerator:	(in millions, except share and per share amounts)
Net income attributable to common shareholders	$	163	$	170	$	502	$	483
Denominator:
Weighted-average common shares outstanding for basic earnings per share	164,227,243		166,694,755		165,622,428		166,195,433
Weighted-average effect of dilutive securities:
Employee equity awards⁽¹⁾	2,071,426		2,315,145		1,931,307		3,036,349
Contingent issuance of common stock	992,247		992,247		330,749		334,384
Weighted-average common shares outstanding for diluted earnings per share	167,290,916		170,002,147		167,884,484		169,566,166
Basic and diluted earnings per share:
Basic earnings per share	$	0.99	$	1.02	$	3.03	$	2.91
Diluted earnings per share	$	0.97	$	1.00	$	2.99	$	2.85

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⁽¹⁾	PSUs, which are considered contingently issuable, are included in the computation of dilutive earnings per share on a weighted average basis when management determines the related performance criteria are met.

There were no securities that were antidilutive for both the three and nine months ended September 30, 2018. Securities that were not included in the computation of diluted earnings per share because their effect was antidilutive totaled 179,712 for the three months ended September 30, 2017 and 325,187 for the nine months ended September 30, 2017.