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STOCK COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Based Compensation
Total stock based compensation expense for non-qualified stock options, restricted stock units ("RSU"), and the tax related benefit for the three and nine months ended September 30, 2020 and 2019 were as follows:
Three Months EndedNine Months Ended
(in millions)2020201920202019
Stock option expense$1.6 $0.6 $5.1 $5.6 
RSU expense14.7 14.6 30.3 43.4 
Total stock based compensation expense$16.3 $15.2 $35.4 $49.0 
Related deferred income tax benefit$1.6 $1.8 $3.7 $6.8