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Earnings per Share
 9 Months Ended
Oct. 02, 2016
Earnings Per Share [Abstract]  
Earnings per Share
Earnings per Share
The following table presents the calculation of basic and diluted earnings per share:
 
 
Three Months Ended
 
Nine Months Ended
 
 
October 2,

 
September 27,

 
October 2,

 
September 27,

(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)
 
2016

 
2015

 
2016

 
2015

Numerator
 
 
 
 
 
 
 
 
Net income before allocation to noncontrolling interests
 
$
237

 
$
190

 
$
665

 
$
319

Less: net income (loss) attributable to noncontrolling interests
 
(2
)
 
1

 
(2
)
 
2

Net income attributable to Zoetis Inc.
 
$
239

 
$
189

 
$
667

 
$
317

Denominator
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
495.2

 
499.2

 
496.3

 
500.2

Common stock equivalents: stock options, RSUs, PSUs and DSUs
 
2.7

 
2.5

 
2.5

 
2.3

Weighted-average common and potential dilutive shares outstanding
 
497.9

 
501.7

 
498.8

 
502.5

 
 
 
 
 
 
 
 
 
Earnings per share attributable to Zoetis Inc. stockholders—basic
 
$
0.48

 
$
0.38

 
$
1.34

 
$
0.63

Earnings per share attributable to Zoetis Inc. stockholders—diluted
 
$
0.48

 
$
0.38

 
$
1.34

 
$
0.63


There were approximately 1 million stock options outstanding for the each of the three and nine months ended October 2, 2016, and September 27, 2015, under the company’s Equity Plan that were excluded from the computation of diluted earnings per share as the effect would have been anti-dilutive.