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Net Income Per Common Share
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Net Income Per Common Share
Basic earnings per share are computed based on the weighted average number of common shares outstanding. Diluted earnings per share are computed based on the weighted average number of common and dilutive potential common shares outstanding using the treasury stock method. The table shows calculations for basic and diluted earnings per share:
(In millions except per share data)
 
Three months ended June 30,
 
Six months ended June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 

 
 

 
 

 
 

Net income—basic and diluted
 
$
123

 
$
176

 
$
311

 
$
304

Denominator:
 
 

 
 

 
 

 
 

Basic weighted-average common shares outstanding
 
164.5

 
164.1

 
164.4

 
164.1

Effect of share-based awards:
 
 

 
 

 
 

 
 

Stock options
 
1.1

 
0.9

 
1.1

 
0.9

Nonvested shares
 
0.9

 
0.5

 
0.8

 
0.5

Diluted weighted-average shares
 
166.5

 
165.5

 
166.3

 
165.5

Earnings per share:
 
 

 
 

 
 

 
 

Basic
 
$
0.75

 
$
1.07

 
$
1.89

 
$
1.85

Diluted
 
0.74

 
1.06

 
1.87

 
1.84

Number of anti-dilutive share-based awards:
 
0.3

 
0.7

 
0.4

 
0.7

 
 
 
 
 
 
 
 
 


The sources of dilution of our common shares are certain equity-based awards. See our 2015 Annual Report on Form 10-K, Item 8, Note 17, Share-Based Associate Compensation Plans, Page 152, for information about equity-based awards. The above table shows the number of anti-dilutive share-based awards for the three and six months ended June 30, 2016 and 2015. We did not include these share-based awards in the computation of net income per common share (diluted) because their exercise would have anti-dilutive effects.