Earnings Per Common Share

Basic earnings or loss per common share is computed by dividing net income by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per common share is computed similar to basic earnings per common share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock.

The computations for basic and diluted earnings per common share are as follows:



	Quarter Ended September 30,						Six Months Ended September 30,
(In millions, except per share amounts)	2018			2017			2018			2017
Income from continuing operations	$	552		$	56		$	471		$	419
Net income attributable to noncontrolling interests	(54		)	(55		)	(112		)	(111		)
Income from continuing operations attributable to McKesson	498			1			359			308
Income from discontinued operations, net of tax	1			—			2			2
Net income attributable to McKesson	$	499		$	1		$	361		$	310

Weighted average common shares outstanding:
Basic	198			209			200			210
Effect of dilutive securities:
Options to purchase common stock	—			—			—			—
Restricted stock units	1			1			1			1
Diluted	199			210			201			211

Earnings per common share attributable to McKesson: ⁽¹⁾
Diluted
Continuing operations	$	2.51		$	0.01		$	1.79		$	1.46
Discontinued operations	—			—			0.01			0.01
Total	$	2.51		$	0.01		$	1.80		$	1.47
Basic
Continuing operations	$	2.52		$	0.01		$	1.80		$	1.47
Discontinued operations	—			—			0.01			0.01
Total	$	2.52		$	0.01		$	1.81		$	1.48


(1)	Certain computations may reflect rounding adjustments.

Potentially dilutive securities include outstanding stock options, restricted stock units, and performance-based and other restricted stock units. Approximately 2 million potentially dilutive securities were excluded from the computations of diluted net earnings per common share for each of the quarters ended September 30, 2018 and 2017 and for the six months ended September 30, 2018 and 2017, as they were anti-dilutive.