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STOCK-BASED COMPENSATION - Plans (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
plan
Sep. 30, 2017
USD ($)
STOCK-BASED COMPENSATION        
Stock-based compensation plans | plan     2  
Compensation expense on share-based plans $ 14.1 $ 13.3 $ 42.4 $ 39.3
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options $ 3.1 $ 2.5 $ 7.7 $ 13.8