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Earnings Per Common Share
 6 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Common Share
Earnings Per Common Share
Basic earnings 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 similarly to basic earnings per common share except that the former 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 common share for the second quarter and first six months of 2020 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 September 30,
 
Six Months Ended September 30,
(In millions, except per share amounts)
2019
 
2018
 
2019
 
2018
Income (Loss) from continuing operations
$
(676
)
 
$
552

 
$
(193
)
 
$
471

Net income attributable to noncontrolling interests
(53
)
 
(54
)
 
(107
)
 
(112
)
Income (Loss) from continuing operations attributable to McKesson
(729
)
 
498

 
(300
)
 
359

Income (Loss) from discontinued operations, net of tax
(1
)
 
1

 
(7
)
 
2

Net income (loss) attributable to McKesson
$
(730
)
 
$
499

 
$
(307
)
 
$
361

 
 
 
 
 
 
 
 
Weighted average common shares outstanding:
 
 
 
 
 
 
 
Basic
183

 
198

 
185

 
200

Effect of dilutive securities:
 
 
 
 
 
 
 
Restricted stock units
—

 
1

 
—

 
1

Diluted
183

 
199

 
185

 
201

 
 
 
 
 
 
 
 
Earnings (Loss) per common share attributable to McKesson: (1)
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
Continuing operations
$
(3.99
)
 
$
2.51

 
$
(1.62
)
 
$
1.79

Discontinued operations
—

 
—

 
(0.03
)
 
0.01

Total
$
(3.99
)
 
$
2.51

 
$
(1.65
)
 
$
1.80

Basic
 
 
 
 
 
 
 
Continuing operations
$
(3.99
)
 
$
2.52

 
$
(1.62
)
 
$
1.80

Discontinued operations
—

 
—

 
(0.03
)
 
0.01

Total
$
(3.99
)
 
$
2.52

 
$
(1.65
)
 
$
1.81


(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 second quarter and first six months of 2019, as they were anti-dilutive.