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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE

Basic and diluted income (loss) per share are computed by dividing net income (loss) by the weighted-average number of common shares outstanding.  Diluted net income per share reflects the dilutive effect of stock-based compensation.

 
Years ended December 31,
 
2017
 
2016
 
2015
Computation of Income (Loss) per Share
(In millions, except per share data)
Net income (loss)
$
549.5

 
$
(3.9
)
 
$
(1.4
)
Basic shares
166.2

 
165.2

 
103.4

Basic net income (loss) per share
$
3.31

 
$
(0.02
)
 
$
(0.01
)
Diluted shares:
 
 
 
 
 
Basic shares
166.2

 
165.2

 
103.4

Stock-based compensation
2.3

 
—

 
—

Diluted shares
168.5

 
165.2

 
103.4

Diluted net income (loss) per share
$
3.26

 
$
(0.02
)
 
$
(0.01
)


The computation of dilutive shares from stock-based compensation does not include 1.6 million, 6.5 million and 5.2 million shares in 2017, 2016 and 2015, respectively, as their effect would have been anti-dilutive.