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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
NOTE 6. 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 (loss) per share reflects the dilutive effect of stock-based compensation.
 
Years ended December 31,
 
2018
 
2017
 
2016
Computation of Income (Loss) per Share
(In millions, except per share data)
Net income (loss)
$
327.9

 
$
549.5

 
$
(3.9
)
Basic shares
166.8

 
166.2

 
165.2

Basic net income (loss) per share
$
1.97

 
$
3.31

 
$
(0.02
)
Diluted shares:
 
 
 
 
 
Basic shares
166.8

 
166.2

 
165.2

Stock-based compensation
1.6

 
2.3

 
—

Diluted shares
168.4

 
168.5

 
165.2

Diluted net income (loss) per share
$
1.95

 
$
3.26

 
$
(0.02
)


The computation of dilutive shares from stock-based compensation does not include 2.4 million, 1.6 million and 6.5 million shares in 2018, 2017 and 2016, respectively, as their effect would have been anti-dilutive.