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STOCK-BASED COMPENSATION - Stock Options (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
plan
Sep. 30, 2015
USD ($)
Stock-based compensation        
Stock-based compensation plans | plan     2  
Compensation expense on share-based plans $ 12.1 $ 8.9 $ 33.7 $ 23.7
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 3.5 3.6 7.1 303.9
Adjustments for New Accounting Principle | Accounting Standards Update 2016-09: Simplifying the accounting for share-based compensation        
Stock-based compensation        
Excess tax benefit from stock based compensation $ 3.5   $ 7.1  
Adjustments to additional paid-in-capital, benefit associated with share-based compensation   $ 3.6   $ 303.9