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STOCK COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Based Compensation
The following represents total stock based compensation expense for non-qualified stock options, RSUs and the tax related benefit for the three and nine months ended September 30, 2019 and 2018:
Three Months EndedNine Months Ended
(in millions)2019201820192018
Stock option expense$0.6  $1.7  $5.6  $5.1  
RSU expense14.6  3.4  43.4  9.2  
Total stock based compensation expense$15.2  $5.1  $49.0  $14.3  
Related deferred income tax benefit$1.8  $0.8  $6.8  $2.4