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SHARE-BASED AWARDS AND OPTIONS - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
May 31, 2015
May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Outstanding, beginning of period (in shares) 811 759   894 1,532  
Granted (in shares) 73 124   145 306  
Forfeited (in shares) (1) 0   (8) (48)  
Exercised (in shares) (124) (160)   (220) (896)  
Outstanding, end of period (in shares) 759 723 759 811 894 1,532
Options vested and exercisable (in shares)   502        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]            
Outstanding, Weighted Average Exercise Price, beginning of period (in dollars per share) $ 31.81 $ 37.51   $ 25.47 $ 20.36  
Granted, Weighted Average Exercise Price (in dollars per share) 74.66 79.45   55.92 35.78  
Forfeited, Weighted Average Exercise Price (in dollars per share) 22.93 0.00   16.10 27.42  
Exercised, Weighted Average Exercise Price (in dollars per share) 22.26 23.50   22.46 20.15  
Outstanding, Weighted Average Exercise Price, end of period (in dollars per share) $ 37.51 47.79 $ 37.51 $ 31.81 $ 25.47 $ 20.36
Options vested and exercisable, Weighted Average Exercise Price (in dollars per share)   $ 36.60        
Weighted-Average Remaining Contractual Term            
Outstanding, Weighted Average Remaining Contractual Term 6 years 6 years 5 months   5 years 9 months 18 days 5 years 2 months 8 days 3 years 9 months 18 days
Options vested and exercisable, Weighted Average Remaining Contractual Term     5 years 5 months      
Aggregate Intrinsic Value            
Outstanding, Aggregate Intrinsic Value $ 24.5 $ 37.9 $ 24.5 $ 36.8 $ 23.9 $ 21.3
Exercised $ 6.5 10.1   $ 9.4 $ 16.6  
Options vested and exercisable, Aggregate Intrinsic Value   $ 31.9