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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, 2018
Dec. 31, 2017
Options    
Outstanding at beginning of period (shares) 723  
Granted (shares) 103  
Forfeited (shares) (4)  
Exercised (shares) (49)  
Outstanding at end of period (shares) 773 723
Options vested and exercisable (shares) 491  
Weighted-Average Exercise Price    
Outstanding at beginning of period (USD per share) $ 47.79  
Granted (USD per share) 114.70  
Forfeited (USD per share) 19.64  
Exercised (USD per share) 21.85  
Outstanding at end of period (USD per share) 58.45 $ 47.79
Options vested and exercisable (USD per share) $ 41.79  
Weighted-Average Remaining Contractual Term    
Outstanding 6 years 9 months 6 years 5 months
Options vested and exercisable 5 years 8 months  
Aggregate Intrinsic Value    
Outstanding $ 41.3 $ 37.9
Options vested and exercisable $ 34.2