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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock options            
Stock-based compensation            
Weighted-average grant-date fair value of options granted (in dollars per share) $ 20.61     $ 19.74 $ 18.04 $ 16.94
Total intrinsic value of options exercised $ 12.5     $ 9.1 $ 53.4 $ 30.6
Cash received from option exercises 7.7     $ 2.4 26.8 $ 10.6
Total unrecognized compensation expense related to non-vested shares granted to employees $ 91.8       $ 91.8  
Cost expected to be recognized over a weighted-average period         2 years 9 months 18 days  
Stock units expected to vest (in shares) 20,870,000       20,870,000  
Restricted stock units            
Stock-based compensation            
Total unrecognized compensation expense related to non-vested shares granted to employees $ 17.3       $ 17.3  
Cost expected to be recognized over a weighted-average period         1 year 8 months 12 days  
Stock units expected to vest (in shares) 500,000       500,000  
Number of Shares            
Non-vested at the beginning of the period (in shares)     556,000   556,000  
Granted (in shares) 0 23,000 252,000 0    
Vested (in shares)         (289,000)  
Forfeited/cancelled (in shares)         (2,000)  
Non-vested at the end of the period (in shares) 540,000       540,000  
Weighted Average Grant-Date Fair Value            
Non-vested at the beginning of the period (in dollars per share)     $ 39.95   $ 39.95  
Granted (in dollars per share)   $ 50.86 $ 46.27   46.65 $ 44.71
Vested (in dollars per share)         37.64  
Forfeited/cancelled (in dollars per share)         20.69  
Non-vested at the end of the period (in dollars per share) $ 44.67       $ 44.67