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STOCK-BASED COMPENSATION - Plans (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
plan
Sep. 30, 2016
USD ($)
Stock-based compensation        
Stock-based compensation plans | plan     2  
Compensation expense on share-based plans $ 13.3 $ 12.1 $ 39.3 $ 33.7
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options 2.5 $ 3.5 13.8 $ 7.1
Non-Employee Director Deferral Plan        
Stock-based compensation        
Deferrals $ 0.0   $ 0.0