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EQUITY COMPENSATION - Restricted Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 16, 2021
Jun. 16, 2021
Mar. 17, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity compensation              
Dividend declared and paid per class A common stock (in dollars per share) $ 0.47 $ 0.47 $ 0.47        
Distribution equivalents made to holders       $ 6.4   $ 21.7  
Class A Common Stock              
Equity compensation              
Shares delivered in period           4,400,000 2,600,000
Dividend declared and paid per class A common stock (in dollars per share)       $ 0.47 $ 0.40 $ 1.41 $ 1.20
Restricted units              
Equity compensation              
Shares delivered in period           8,200,000 4,700,000
Restricted Units              
Balance at the beginning of the period (in shares)           16,299,664  
Granted (in shares)           9,667,989  
Vested (in shares)           (6,278,948)  
Forfeited (in shares)           (1,255,502)  
Balance at the end of the period (in shares)       18,433,203   18,433,203  
Weighted Average Grant Date Fair Value Per Unit              
Balance at the beginning of the period (in dollars per share)           $ 24.30  
Granted (in dollars per share)           46.16  
Vested (in dollars per share)           20.70  
Forfeited (in dollars per share)           30.48  
Balance at the end of the period (in dollars per share)       $ 36.33   $ 36.33  
Unrecognized compensation expenses       $ 504.8   $ 504.8  
Weighted average period of compensation expense expected to be recognized           3 years 6 months  
Restricted units | Third Anniversary of Grant Date              
Equity compensation              
Annual award vesting percentage           33.33%  
Restricted units | First Anniversary of Grant Date              
Equity compensation              
Annual award vesting percentage           25.00%  
Restricted units | First Anniversary              
Equity compensation              
Annual award vesting percentage           33.33%  
Restricted units | Senior executives              
Equity compensation              
Annual award vesting percentage           25.00%