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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2015
Earnings Per Share, Basic and Diluted [Abstract]  
EARNINGS (LOSS) PER SHARE
EARNINGS PER SHARE

The computation of basic and diluted earnings per common share was as follows (in millions, except per share data):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Amounts attributable to Quest Diagnostics’ stockholders:
 

 
 

 
 

 
 

Net income attributable to Quest Diagnostics
$
342

 
$
129

 
$
521

 
$
366

Less: Earnings allocated to participating securities
2

 
1

 
3

 
2

 
 
 
 
 
 
 
 
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted
$
340

 
$
128

 
$
518

 
$
364

 
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
144

 
145

 
144

 
144

Effect of dilutive securities:
 

 
 

 
 

 
 

Stock options and performance share units
1

 
—

 
1

 
1

 
 
 
 
 
 
 
 
Weighted average common shares outstanding – diluted
145

 
145

 
145

 
145

 
 
 
 
 
 
 
 
Earnings per share attributable to Quest Diagnostics’ common stockholders:
 

 
 

 
 

 
 

Basic
$
2.37

 
$
0.89

 
$
3.61

 
$
2.52

 
 
 
 
 
 
 
 
Diluted
$
2.35

 
$
0.88

 
$
3.58

 
$
2.51



The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect (shares in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Stock options and performance share units
2

 
—

 
2

 
3