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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
STOCK-BASED COMPENSATION          
Cost expected to be recognized over a weighted-average period       2 years 8 months 12 days  
Stock options          
STOCK-BASED COMPENSATION          
Granted (in shares)   1,570      
Weighted-average grant-date fair value of options granted (in dollars per share)     $ 20.20 $ 20.30 $ 22.51
Total intrinsic value of options exercised $ 32.9   $ 14.7 $ 211.3 $ 32.9
Cash received from option exercises 46.0   $ 7.1 81.1 $ 13.6
Total unrecognized compensation expense related to non-vested shares granted to employees $ 101.1     $ 101.1  
Stock units expected to vest (in shares) 14,310     14,310  
Restricted stock units          
STOCK-BASED COMPENSATION          
Total unrecognized compensation expense related to non-vested shares granted to employees $ 37.5     $ 37.5  
Cost expected to be recognized over a weighted-average period       3 years 1 month 6 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) 18 548      
Vested (in shares)       (265)  
Forfeited/cancelled (in shares)       (3)  
Non-vested at the end of the period (in shares) 827     827  
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) $ 63.48 $ 59.66 $ 52.31 59.79 $ 57.59
Vested (in dollars per share)       50.11  
Forfeited/cancelled (in dollars per share)       59.67  
Non-vested at the end of the period (in dollars per share) $ 57.62     $ 57.62