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STOCK-BASED COMPENSATION (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
plan
Sep. 30, 2014
USD ($)
Stock-based compensation        
Stock-based compensation plans | plan     2  
Compensation expense on share-based plans $ 8.9 $ 7.4 $ 23.7 $ 22.5
Stock options        
Stock-based compensation        
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options $ 3.6 $ 8.2 $ 303.9 $ 11.5