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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
STOCK-BASED COMPENSATION            
Cost expected to be recognized over a weighted-average period         2 years 6 months  
Stock options            
STOCK-BASED COMPENSATION            
Granted (in shares) 52   1,570      
Weighted-average grant-date fair value of options granted (in dollars per share) $ 18.32     $ 22.80 $ 20.24 $ 22.51
Total intrinsic value of options exercised $ 2.4     $ 19.2 $ 213.8 $ 52.1
Cash received from option exercises 4.1     $ 10.9 85.2 $ 24.5
Total unrecognized compensation expense related to non-vested shares granted to employees $ 90.4       $ 90.4  
Stock units expected to vest (in shares) 14,290       14,290  
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 58.54          
Restricted stock units            
STOCK-BASED COMPENSATION            
Total unrecognized compensation expense related to non-vested shares granted to employees $ 33.4       $ 33.4  
Cost expected to be recognized over a weighted-average period         2 years 10 months 24 days  
Stock units expected to vest (in shares) 700       700  
Number of Shares            
Non-vested at the beginning of the period (in shares)     529   529  
Granted (in shares) 1 18 548      
Vested (in shares)         (265)  
Forfeited/cancelled (in shares)         (6)  
Non-vested at the end of the period (in shares) 825       825  
Weighted Average Grant-Date Fair Value            
Non-vested at the beginning of the period (in dollars per share)     $ 51.55   $ 51.55  
Granted (in dollars per share) $ 66.00 $ 63.48 $ 59.66 $ 58.72 59.79 $ 57.59
Vested (in dollars per share)         50.10  
Forfeited/cancelled (in dollars per share)         59.67  
Non-vested at the end of the period (in dollars per share) $ 57.63       $ 57.63