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Earnings Per Common Share
 12 Months Ended
Mar. 31, 2018
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 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:
 
Years Ended March 31,
(In millions, except per share amounts)
2018
 
2017
 
2016
Income from continuing operations
$
292

 
$
5,277

 
$
2,342

Net income attributable to noncontrolling interests
(230
)
 
(83
)
 
(52
)
Income from continuing operations attributable to McKesson
62

 
5,194

 
2,290

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

 
(124
)
 
(32
)
Net income attributable to McKesson
$
67

 
$
5,070

 
$
2,258

 
 
 
 
 
 
Weighted average common shares outstanding:
 
 
 
 
 
Basic
208

 
221

 
230

Effect of dilutive securities:
 
 
 
 
 
Options to purchase common stock
—

 
1

 
1

Restricted stock units
1

 
1

 
2

Diluted
209

 
223

 
233

 
 
 
 
 
 
Earnings (loss) per common share attributable to McKesson: (1)
 
 
 
 
 
Diluted
 
 
 
 
 
Continuing operations
$
0.30

 
$
23.28

 
$
9.84

Discontinued operations
0.02

 
(0.55
)
 
(0.14
)
Total
$
0.32

 
$
22.73

 
$
9.70

Basic
 
 
 
 
 
Continuing operations
$
0.30

 
$
23.50

 
$
9.96

Discontinued operations
0.02

 
(0.55
)
 
(0.14
)
Total
$
0.32

 
$
22.95

 
$
9.82


(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 of potentially dilutive securities were excluded from the computations of diluted net earnings per common share in 2018, 2017 and 2016, as they were anti-dilutive.