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SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Option Activity (Details) - Employee stock option - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Options    
Outstanding at beginning of period (shares) 598  
Replacement Awards (shares) 1,336  
Granted (shares) 109  
Exercised (shares) (221)  
Outstanding at end of period (shares) 1,822 598
Options vested and exercisable (shares) 1,217  
Weighted-Average Exercise Price    
Outstanding at beginning of period (USD per share) $ 59.16  
Replacement Awards (USD per share) 68.96  
Granted (USD per share) 128.22  
Exercised (USD per share) 32.54  
Outstanding at end of period (USD per share) 73.71 $ 59.16
Options vested and exercisable (USD per share) $ 57.29  
Weighted-Average Remaining Contractual Term    
Outstanding 6 years 9 months 18 days 6 years 2 months 12 days
Options vested and exercisable 5 years 10 months 24 days  
Aggregate Intrinsic Value    
Outstanding $ 155.4 $ 27.3
Options vested and exercisable $ 123.7