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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - Employee stock option - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Options    
Outstanding at beginning of period (shares) 598  
Granted (shares) 109  
Exercised (shares) (193)  
Outstanding at end of period (shares) 514 598
Options vested and exercisable (shares) 296  
Weighted-Average Exercise Price    
Outstanding at beginning of period (USD per share) $ 59.16  
Granted (USD per share) 128.22  
Exercised (USD per share) 34.01  
Outstanding at end of period (USD per share) 83.31 $ 59.16
Options vested and exercisable (USD per share) $ 61.73  
Weighted-Average Remaining Contractual Term    
Outstanding 7 years 1 month 6 days 6 years 2 months 12 days
Options vested and exercisable 5 years 9 months 18 days  
Aggregate Intrinsic Value    
Outstanding $ 39.5 $ 27.3
Options vested and exercisable $ 29.1