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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock options    
STOCK-BASED COMPENSATION    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 20.30 $ 22.82
Total intrinsic value of options exercised $ 178.5 $ 18.2
Cash received from option exercises 35.2 $ 6.5
Total unrecognized compensation expense related to non-vested shares granted to employees $ 112.8  
Cost expected to be recognized over a weighted-average period 2 years 10 months 24 days  
Stock units expected to vest (in shares) 15,564  
Restricted stock units    
STOCK-BASED COMPENSATION    
Total unrecognized compensation expense related to non-vested shares granted to employees $ 40.4  
Cost expected to be recognized over a weighted-average period 3 years 3 months 18 days  
Stock units expected to vest (in shares) 700  
Number of Shares    
Non-vested at the beginning of the period (in shares) 529  
Granted (in shares) 548  
Vested (in shares) (244)  
Non-vested at the end of the period (in shares) 833  
Weighted Average Grant-Date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 51.55  
Granted (in dollars per share) 59.66 $ 58.75
Vested (in dollars per share) 49.91  
Non-vested at the end of the period (in dollars per share) $ 57.36