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EQUITY-BASED COMPENSATION - Class A and OCGH Unit Awards (Details)
$ in Millions
1 Months Ended 12 Months Ended 33 Months Ended
Mar. 31, 2018
Dec. 31, 2019
USD ($)
company
shares
Sep. 30, 2019
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Sep. 30, 2018
Class A Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units granted (in shares)   1,494,324        
Share exchange rate (in shares)   1        
OCGH Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units granted (in shares)   1,873,155   124,051 274,018  
Units vesting periods   5 years 9 months 18 days        
Estimated time-to-liquidity assumption 7 years 6 years 4 months 24 days     5 years 9 months 18 days  
Share exchange rate (in shares)   1        
Number of comparable publicly-owned alternative asset managers | company   5        
Discount rate     17.50%     20.00%
Converted OCGH Units and OCGH Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested equity-based awards | $   $ 35.8        
Recognition period   3 years 2 months 12 days