Net Earnings per Share

The basic weighted average shares and common stock equivalents for the three months ended June 30, 2018 and 2017 are computed using the treasury stock method.

The following table summarizes the earnings per share attributable to FIS common stockholders for the three and six months ended June 30, 2018 and 2017 (in millions, except per share amounts):



	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
			As Adjusted				As Adjusted
Net earnings attributable to FIS common stockholders	$	212	$	139	$	394	$	269
Weighted average shares outstanding — basic	329		330		329		329
Plus: Common stock equivalent shares	4		4		5		5
Weighted average shares outstanding — diluted	333		334		334		334
Net earnings per share — basic attributable to FIS common stockholders	$	0.64	$	0.42	$	1.20	$	0.82
Net earnings per share — diluted attributable to FIS common stockholders	$	0.64	$	0.42	$	1.18	$	0.81

Options to purchase 1 million and 4 million shares of our common stock for the three months and 1 million and 4 million shares for the six months ended June 30, 2018 and 2017, respectively, were not included in the computation of diluted earnings per share because they were anti-dilutive.

On July 20, 2017 our Board of Directors approved a plan authorizing repurchases of up to $4.0 billion of our outstanding common stock in the open market at prevailing market prices or in privately negotiated transactions through December 31, 2020. This share repurchase authorization replaced any existing share repurchase authorization.