EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share Table
 
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
)