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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
 
In millions, except per share amounts
2019
 
2018
 
Net loss attributable to common stockholders
$
(10
)
 
$
(7
)
 
Weighted average outstanding shares of common stock
117.1

 
121.4

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

 
—

 
Common stock and common stock equivalents
117.1

 
121.4

 
Net loss per share:
 
 
 
 
Basic
$
(0.09
)
 
$
(0.06
)
 
Diluted
$
(0.09
)
 
$
(0.06
)