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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
NOTE 10. EARNINGS PER SHARE

Basic and diluted net (loss) income per share are computed by dividing net (loss) income by the weighted-average number of common shares outstanding. Diluted net (loss) income per share reflects the dilutive effect of stock-based compensation.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Computation of Income (Loss) per Share
(In millions, except per share data)
Net (loss) income
$
(20.0
)
 
$
58.6

 
$
21.7

 
$
79.5

Basic shares
164.6

 
167.1

 
164.8

 
167.1

Basic net (loss) income per share
$
(0.12
)
 
$
0.35

 
$
0.13

 
$
0.48

Diluted shares:
 
 
 
 
 
 
 
Basic shares
164.6

 
167.1

 
164.8

 
167.1

Stock-based compensation
—

 
1.7

 
0.9

 
2.0

Diluted shares
164.6

 
168.8

 
165.7

 
169.1

Diluted net (loss) income per share
$
(0.12
)
 
$
0.35

 
$
0.13

 
$
0.47



The computation of dilutive shares from stock-based compensation does not include 8.0 million and 2.5 million shares for the three months ended June 30, 2019 and 2018, respectively, and 5.5 million and 2.5 million shares for the six months ended June 30, 2019 and 2018, respectively, as their effect would have been anti-dilutive.