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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
infrastructureDebtFund
Mar. 31, 2022
USD ($)
COMMITMENTS AND CONTINGENCIES              
Unfunded capital commitments $ 923,600,000     $ 923,600,000   $ 677,900,000  
Maximum exposure from guarantees 16,400,000     $ 16,400,000   31,500,000  
Recognition period       4 years      
Cash payment   $ 3,400,000          
Performance Income              
Carried interest, contingent repayment obligations $ 0     $ 0   0  
Minimum              
Performance Income              
Lease terms 1 year     1 year      
Maximum              
Performance Income              
Lease terms 13 years     13 years      
Performance income              
Performance Income              
Performance income subject to potential clawback provision $ 84,300,000     $ 84,300,000   128,400,000  
Performance income subject to potential claw back provision that are reimbursable by professionals 65,900,000     65,900,000   101,000,000  
Infrastructure Debt Acquisition              
COMMITMENTS AND CONTINGENCIES              
Commitment, maximum amount 15,000,000     $ 15,000,000     $ 48,500,000
Business combination, percentage       15.00%      
Business combination equity awards percentage       85.00%      
Contingent liability recognized       $ 13,600,000   13,500,000  
Management incentive program, amount accrued 3,900,000     3,900,000   $ 2,200,000  
Compensation expense $ 600,000   $ 600,000 $ 1,800,000 $ 1,600,000    
Infrastructure Debt Acquisition | Revenue Target              
COMMITMENTS AND CONTINGENCIES              
Number of infrastructure debt funds revenue targets achieved | infrastructureDebtFund           1  
Contingent liability recognized           $ 21,800,000  
Management incentive program, amount accrued           $ 7,000,000  
Compensation expense     $ 2,200,000   $ 5,500,000