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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2017
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
June 30,
 
Six Months Ended 
 June 30,
In millions, except per share amounts
2017
 
2016
 
2017
 
2016
Net loss attributable to common stockholders
$
(4
)
 
$
64

 
$
(6
)
 
$
18

Weighted average outstanding shares of common stock
127.9

 
129.8

 
129.2

 
129.6

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

 
1.7

 
—

 
1.6

Common stock and common stock equivalents
127.9

 
131.5

 
129.2

 
131.2

Loss per share:
 
 
 
 
 
 
 
Basic
$
(0.03
)
 
$
0.49

 
$
(0.05
)
 
$
0.14

Diluted
$
(0.03
)
 
$
0.49

 
$
(0.05
)
 
$
0.14