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SHARE-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Weighted Average Exercise Price Per Share      
Exercised, weighted average exercise price per share (in dollars per share) $ 17.42    
Risk-free interest rate 1.46%    
Expected life (in years) 6 years 4 months 17 days    
Dividend yield 0.00%    
Volatility 28.39%    
Grant date fair value $ 7.74    
Performance Based Vesting      
Weighted Average Exercise Price Per Share      
Risk-free interest rate 1.46%    
Expected life (in years) 4 years    
Dividend yield 0.00%    
Volatility 34.22%    
2017 LTIP      
Weighted Average Exercise Price Per Share      
Beginning balance (in dollars per share) $ 19.12    
Granted (in dollars per share) 28.36    
Forfeited (in dollars per share) 20.21    
Ending balance (in dollars per share) 25.25    
Options exercisable (in dollars per share) $ 17.73    
Options outstanding, Weighted Average Remaining Contractual Term (in years) 9 years 4 months 17 days 8 years 8 months 26 days  
Options exercisable, Weighted Average Remaining Contractual Term (in years) 7 years 7 months 2 days    
Options outstanding, Aggregate Intrinsic Value $ 48,549,000   $ 112,915,000
Options exercisable, Aggregate Intrinsic Value $ 3,834,000    
2017 LTIP | Shares Under Option      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Beginning balance (in shares) 14,083,741    
Granted (in shares) 25,761,736    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 116,597    
Forfeited (in shares) (1,022,960)    
Ending balance (in shares) 38,705,920    
Options exercisable (in shares) 831,596    
Weighted Average Exercise Price Per Share      
Share based compensation expense $ 20,349,000 $ 7,317,000  
Share based compensation - Unrecognized deferred compensation cost $ 229,690,000    
Expected time (in years) unrecogized compensation costs relating to share based awards will be recognized 2040-03    
2017 LTIP | Performance Based Vesting      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted (in shares) 7,556,330    
Weighted Average Exercise Price Per Share      
Share based compensation expense $ 3,901,000    
Share based compensation - Unrecognized deferred compensation cost $ 77,045,000    
Expected time (in years) unrecogized compensation costs relating to share based awards will be recognized 2083-03    
Grant date fair value $ 10.65    
2017 LTIP | Employee Stock Option (subject to shareholder approval) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted (in shares) 24,305,000    
2017 LTIP | Performance awards (subject to shareholder approval) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted (in shares) 7,230,575    
2019 LTIP [Member] | Restricted Stock      
Weighted Average Exercise Price Per Share      
Share based compensation expense $ 576,000