COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)	6 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2021	Jul. 01, 2021	Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES
Unfunded capital commitments	$ 677,300,000	$ 677,300,000	$ 677,300,000		$ 784,200,000
Maximum exposure from guarantees	209,700,000	209,700,000	209,700,000		0
Performance Income
Carried interest, contingent repayment obligations	0	0	0		0
Performance income
Performance Income
Performance income subject to potential clawback provision	194,600,000	194,600,000	194,600,000		326,400,000
Performance income subject to potential claw back provision that are reimbursable by professionals	153,300,000	153,300,000	153,300,000		$ 252,400,000
Landmark Acquisition
COMMITMENTS AND CONTINGENCIES
Commitment, maximum amount	300,000,000	300,000,000	$ 300,000,000
Business combination, percentage			15.00%
Business combination equity awards percentage			85.00%
Vesting period			4 years
Estimated fair value of the contingent consideration liability	145,700,000	145,700,000	$ 145,700,000
Compensation expense		21,000,000
Black Creek Acquisition
COMMITMENTS AND CONTINGENCIES
Commitment, maximum amount	275,000,000	275,000,000	275,000,000
Compensation expense	45,900,000
Fair value of contingent liability	$ 229,500,000	$ 229,500,000	$ 229,500,000
Payment percentage of performance income obligation	50.00%	50.00%	50.00%
Contingent consideration	$ 47,900,000	$ 47,900,000	$ 47,900,000	$ 28,600,000