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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
NOTE 6. 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.
 
Years ended December 31,
 
2019
 
2018
 
2017
Computation of (Loss) Income per Share
(In millions, except per share data)
Net (loss) income
$
(11.3
)
 
$
327.9

 
$
549.5

Basic shares
162.3

 
166.8

 
166.2

Basic net (loss) income per share
$
(0.07
)
 
$
1.97

 
$
3.31

Diluted shares:
 
 
 
 
 
Basic shares
162.3

 
166.8

 
166.2

Stock-based compensation
—

 
1.6

 
2.3

Diluted shares
162.3

 
168.4

 
168.5

Diluted net (loss) income per share
$
(0.07
)
 
$
1.95

 
$
3.26



The computation of dilutive shares from stock-based compensation does not include 7.8 million, 2.4 million and 1.6 million shares in 2019, 2018 and 2017, respectively, as their effect would have been anti-dilutive.