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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Options        
Outstanding, beginning of period (shares) 598 723 759  
Granted (shares) 109 103 124  
Replacement Awards (shares) 1,336      
Forfeited (shares) (23) (22)    
Exercised (shares) (265) (206) (160)  
Outstanding, end of period (shares) 1,755 598 723 759
Options vested and exercisable (shares) 1,167      
Weighted-Average Exercise Price        
Outstanding, Weighted Average Exercise Price, beginning of period (USD per share) $ 59.16 $ 47.79 $ 37.51  
Granted, Weighted Average Exercise Price (USD per share) 128.22 114.70 79.45  
Replacement Awards, Weighted Average Exercise Price (USD per share) 68.96      
Forfeited, Weighted Average Exercise Price (USD per share) 110.13 100.38    
Exercised, Weighted Average Exercise Price (USD per share) 33.99 42.65 23.50  
Outstanding, Weighted Average Exercise Price, end of period (USD per share) 74.06 $ 59.16 $ 47.79 $ 37.51
Options vested and exercisable, Weighted Average Exercise Price (USD per share) $ 58.03      
Weighted-Average Remaining Contractual Term        
Outstanding, Weighted Average Remaining Contractual Term 6 years 6 months 6 years 2 months 12 days 6 years 4 months 24 days 6 years
Options vested and exercisable, Weighted Average Remaining Contractual Term 5 years 7 months 6 days      
Aggregate Intrinsic Value        
Outstanding at beginning of period $ 27.3 $ 37.9 $ 24.5  
Exercised 28.8 16.5 10.1  
Outstanding at end of period 190.3 $ 27.3 $ 37.9 $ 24.5
Options vested and exercisable, Aggregate Intrinsic Value $ 145.3