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STOCK COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016.
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
Stock option expense
 
$
2.5

 
$
3.4

 
$
5.2

 
$
5.5

RSU expense
 
8.0

 
8.7

 
15.7

 
11.1

Total stock based compensation expense
 
$
10.5

 
$
12.1

 
$
20.9

 
$
16.6

 
 
 
 
 
 
 
 
 
Related deferred income tax benefit
 
$
2.5

 
$
2.8

 
$
5.8

 
$
4.1