Earnings Per Common Share

Basic earnings or loss per common share are computed by dividing net income by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per common share are 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. Diluted loss per share for the first quarter of 2019 was calculated by excluding potentially dilutive securities from the denominator of the share computation due to their anti-dilutive effects.

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



	Quarter Ended June 30,
(In millions, except per share amounts)	2018			2017
Income (loss) from continuing operations	$	(81	)	$	363
Net income attributable to noncontrolling interests	(58		)	(56		)
Income (loss) from continuing operations attributable to McKesson	(139		)	307
Income from discontinued operations, net of tax	1			2
Net income (loss) attributable to McKesson	$	(138	)	$	309

Weighted average common shares outstanding:
Basic	202			211
Effect of dilutive securities:
Options to purchase common stock	—			1
Restricted stock units	—			1
Diluted	202			213

Earnings (loss) per common share attributable to McKesson: ⁽¹⁾
Diluted
Continuing operations	$	(0.69	)	$	1.44
Discontinued operations	0.01			0.01
Total	$	(0.68	)	$	1.45
Basic
Continuing operations	$	(0.69	)	$	1.46
Discontinued operations	0.01			—
Total	$	(0.68	)	$	1.46


(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 the quarter ended June 30, 2017, as they were anti-dilutive.