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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
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Options    
Outstanding, beginning of period (in shares) 759  
Granted (in shares) 124  
Forfeited (in shares) 0  
Exercised (in shares) (52)  
Outstanding, end of period (in shares) 831 759
Options vested and exercisable (in shares) 449  
Weighted-Average Exercise Price    
Outstanding, weighted average exercise price, beginning of period (in USD per share) $ 37.51  
Granted, weighted average exercise price (in USD per share) 79.45  
Forfeited, weighted average exercise price (in USD per share) 0.00  
Exercised, weighted average exercise price (in USD per share) 23.68  
Outstanding, weighted average exercise price, end of period (in USD per share) 44.65 $ 37.51
Options vested and exercisable, weighted average exercise price (in USD per share) $ 29.49  
Weighted-Average Remaining Contractual Term    
Outstanding, weighted average remaining contractual term (in years) 6 years 7 months 6 days 6 years
Options vested and exercisable, weighted average remaining contractual term (in years) 4 years 8 months 12 days  
Aggregate Intrinsic Value    
Outstanding aggregate intrinsic value $ 0.0 $ 0.0
Options vested and exercisable, aggregate intrinsic value $ 0.0