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STOCK COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Based Compensation
The following table represents total stock based compensation expense for non-qualified stock options, restricted stock units (“RSU”) and the tax related benefit for the three and six months ended June 30, 2018 and 2017.
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Stock option expense
 
$
2.7

 
$
2.5

 
$
3.4

 
$
5.2

RSU expense
 
(2.6
)
 
8.0

 
5.9

 
15.7

Total stock based compensation expense
 
$
0.1

 
$
10.5

 
$
9.3

 
$
20.9

 
 
 
 
 
 
 
 
 
Related deferred income tax benefit
 
$
—

 
$
2.5

 
$
1.6

 
$
5.8