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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Components of Basic and Diluted Earnings Per Share
The components of basic and diluted earnings per share are as follows:
 
Three Months Ended
March 31,
In millions, except per share amounts
2016
 
2015
Net (loss) income attributable to common stockholders
$
(46
)
 
$
22

Weighted average outstanding shares of common stock
129.4

 
145.2

Dilutive effect of employee stock options, restricted stock and other stock awards
—

 
2.5

Common stock and common stock equivalents
129.4

 
147.7

(Loss) income per share:
 
 
 
Basic
$
(0.36
)
 
$
0.15

Diluted
$
(0.36
)
 
$
0.15