COMMITMENTS AND CONTINGENCIES - Narrative (Details)	3 Months Ended			12 Months Ended
	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) infrastructureDebtFund	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
COMMITMENTS AND CONTINGENCIES
Unfunded capital commitments	$ 952,300,000	$ 677,900,000		$ 677,900,000
Maximum exposure from guarantees	$ 76,700,000	31,500,000		31,500,000
Recognition period	4 years
Cash payment	$ 3,400,000
Performance Income
Carried interest, contingent repayment obligations	0	0		0
Performance income
Performance Income
Performance income subject to potential clawback provision	122,400,000	128,400,000		128,400,000
Performance income subject to potential claw back provision that are reimbursable by professionals	96,200,000	101,000,000		101,000,000
Infrastructure Debt Acquisition
COMMITMENTS AND CONTINGENCIES
Commitment, maximum amount	$ 15,000,000				$ 48,500,000
Business combination, percentage	15.00%
Business combination equity awards percentage	85.00%
Contingent liability recognized	$ 13,500,000			13,500,000
Management incentive program, amount accrued	2,700,000	$ 2,200,000		2,200,000
Compensation expense	$ 600,000		$ 300,000
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		$ 7,000,000
Compensation expense			$ 1,100,000