12. Earnings Per Share

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



	Three Months Ended March 31,
	2014		2013

	(in millions, except share and per share amounts)
Numerator:
Net income attributable to common shareholders	$	103	$	42
Denominator:
Weighted-average common shares outstanding for basic earnings per share		169,595,951		165,703,279
Weighted-average effect of dilutive securities:
Employee equity awards		4,070,605		3,958,437
Weighted-average common shares outstanding for diluted earnings per share		173,666,556		169,661,716
Basic and diluted earnings per share:
Basic earnings per share	$	0.61	$	0.26
Diluted earnings per share	$	0.59	$	0.25

Stock options to purchase 4,532,006 shares of common stock and 5,938,944 shares of restricted stock and PSUs were outstanding at March 31, 2014. For the three months ended March 31, 2014, we included 4,398,297 of the outstanding stock options and 4,262,190 shares of restricted stock and PSUs in the computation of diluted earnings per share, on a weighted-average basis, as their inclusion was dilutive. The remaining stock options and shares of restricted stock and PSUs are antidilutive, and as such, they were properly excluded.

Stock options to purchase 7,125,748 shares of common stock and 4,934,596 shares of restricted stock and PSUs were outstanding at March 31, 2013. For the three months ended March 31, 2013, we included 5,855,220 of the outstanding stock options and 4,816,000 shares of restricted stock and PSUs in the computation of diluted earnings per share, on a weighted-average basis, as their inclusion was dilutive. The remaining stock options and shares of restricted stock and PSUs are antidilutive, and as such, they were properly excluded.