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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2018
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
2018
 
2017
 
2018
 
2017
Net income attributable to common stockholders
$
18

 
$
13

 
$
15

 
$
7

Weighted average outstanding shares of common stock
118.7

 
123.7

 
119.9

 
127.3

Dilutive effect of employee stock options, restricted stock and other stock awards
2.0

 
2.1

 
1.9

 
1.8

Common stock and common stock equivalents
120.7

 
125.8

 
121.8

 
129.1

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.15

 
$
0.11

 
$
0.13

 
$
0.05

Diluted
$
0.15

 
$
0.10

 
$
0.12

 
$
0.05