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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2019
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
September 30,
 
Nine Months Ended 
 September 30,
In millions, except per share amounts
2019
 
2018
 
2019
 
2018
Net income (loss) attributable to common stockholders
$
10

 
$
18

 
$
(1
)
 
$
15

Weighted average outstanding shares of common stock
113.2

 
118.7

 
115.2

 
119.9

Dilutive effect of employee stock options, restricted stock and other stock awards
1.0

 
2.0

 
—

 
1.9

Common stock and common stock equivalents
114.2

 
120.7

 
115.2

 
121.8

Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.09

 
$
0.15

 
$
(0.01
)
 
$
0.13

Diluted
$
0.09

 
$
0.15

 
$
(0.01
)
 
$
0.12