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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE

Basic and diluted net income (loss) per share are computed by dividing net income (loss) by the weighted-average number of common shares outstanding. Diluted net income (loss) per share reflects the dilutive effect of stock-based compensation.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Computation of Income (Loss) per Share
(In millions, except per share data)
Net income (loss)
$
52.7

 
$
17.5

 
$
60.2

 
$
(21.4
)
Basic shares
166.3

 
165.2

 
166.0

 
165.2

Basic net income (loss) per share
$
0.32

 
$
0.11

 
$
0.36

 
$
(0.13
)
Diluted shares:
 
 
 
 
 
 
 
Basic shares
166.3

 
165.2

 
166.0

 
165.2

Stock-based compensation
2.2

 
1.3

 
2.2

 
—

Diluted shares
168.5

 
166.5

 
168.2

 
165.2

Diluted net income (loss) per share
$
0.31

 
$
0.11

 
$
0.36

 
$
(0.13
)


The computation of dilutive shares from stock-based compensation does not include 1.6 million shares and 1.9 million shares for the three months ended September 30, 2017 and 2016, respectively, and 1.6 million shares and 6.9 million shares for the nine months ended September 30, 2017 and 2016, respectively, as their effect would have been anti-dilutive.