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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share Table
 
Three Months Ended March 31,
 
2018
 
2017
Computation of Income per Share
(In millions, except per share data)
Net income
$
20.9

 
$
13.4

Basic shares
167.2

 
165.6

Basic net income per share
$
0.13

 
$
0.08

Diluted shares:
 
 
 
Basic shares
167.2

 
165.6

Stock-based compensation
2.0

 
2.3

Diluted shares
169.2

 
167.9

Diluted net income per share
$
0.12

 
$
0.08