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Earnings Per Common Share
 9 Months Ended
Dec. 31, 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 nine months ended December 31, 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:
  
Three Months Ended December 31,
 
Nine Months Ended December 31,
(In millions, except per share amounts)
2019
 
2018
 
2019
 
2018
Income from continuing operations
$
247

 
$
527

 
$
54

 
$
998

Net income attributable to noncontrolling interests
(56
)
 
(57
)
 
(163
)
 
(169
)
Income (Loss) from continuing operations attributable to McKesson
191

 
470

 
(109
)
 
829

Income (Loss) from discontinued operations, net of tax
(5
)
 
(1
)
 
(12
)
 
1

Net income (Loss) attributable to McKesson
$
186

 
$
469

 
$
(121
)
 
$
830

 
 
 
 
 
 
 
 
Weighted average common shares outstanding:
 
 
 
 
 
 
 
Basic
179

 
194

 
183

 
198

Effect of dilutive securities:
 
 
 
 
 
 
 
Restricted stock units
1

 
1

 
—

 
1

Diluted
180

 
195

 
183

 
199

 
 
 
 
 
 
 
 
Earnings (Loss) per common share attributable to McKesson: (1)
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
Continuing operations
$
1.06

 
$
2.41

 
$
(0.60
)
 
$
4.17

Discontinued operations
(0.03
)
 
(0.01
)
 
(0.06
)
 
0.01

Total
$
1.03

 
$
2.40

 
$
(0.66
)
 
$
4.18

Basic
 
 
 
 
 
 
 
Continuing operations
$
1.06

 
$
2.42

 
$
(0.60
)
 
$
4.19

Discontinued operations
(0.02
)
 
(0.01
)
 
(0.06
)
 
—

Total
$
1.04

 
$
2.41

 
$
(0.66
)
 
$
4.19


(1)
Certain computations may reflect rounding adjustments.
Potentially dilutive securities include outstanding stock options, restricted stock units, performance-based stock units and other similar stock awards. Approximately 2 million of potentially dilutive securities for the three months ended December 31, 2019 and approximately 3 million and 2 million of potentially dilutive securities for the three and nine months ended December 31, 2018 were excluded from the computations of diluted net earnings per common share, as they were anti-dilutive.