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Earnings per Share (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended 
 June 30,
In millions, except per share amounts
2019
 
2018
 
2019
 
2018
Net (loss) income attributable to common stockholders
$
(1
)
 
$
4

 
$
(11
)
 
$
(3
)
Weighted average outstanding shares of common stock
115.5

 
119.5

 
116.3

 
120.4

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

 
2.0

 
—

 
—

Common stock and common stock equivalents
115.5

 
121.5

 
116.3

 
120.4

Net loss (income) per share:
 
 
 
 
 
 
 
Basic
$
(0.01
)
 
$
0.03

 
$
(0.09
)
 
$
(0.02
)
Diluted
$
(0.01
)
 
$
0.03

 
$
(0.09
)
 
$
(0.02
)