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Net Income Per Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share
The following table reconciles the Company's net income from continuing operations attributable to common stockholders to basic and diluted net income from continuing operations attributable to common stockholders for the three and nine months ended September 30, 2014 and 2013:
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
Net income from continuing operations attributable to common stockholders
 
$
411

 
$
72

 
$
612

 
$
477

Participating basic earnings
 
(4
)
 
(1
)
 
(5
)
 
(6
)
Basic and diluted income from continuing operations attributable to common stockholders
 
$
407

 
$
71

 
$
607

 
$
471

The following table is a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the three and nine months ended September 30, 2014 and 2013: 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
Weighted average common shares outstanding:
 
 
 
 
 
 
 
 
Basic
 
143

 
139

 
143

 
135

Dilution attributable to convertible senior notes
 
—

 
—

 
—

 
2

Diluted (a)
 
143

 
139

 
143

 
137

 ____________________
(a)
The Company excluded 33,591 shares and 11,197 shares attributable to unvested performance units from the diluted income per share calculations for the three and nine months ended September 30, 2014, respectively, because they would have been anti-dilutive to the calculation. Options to purchase 34,842 shares of the Company's common stock were excluded from the diluted income per share calculations for the nine months ended September 30, 2013 because they would have been anti-dilutive to the calculation.