BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Unconsolidated Investments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) investment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of investments, fair value option | investment	67
Accrued performance fees	$ 141.6
Fees receivable	$ 6.8	$ 9.6	$ 0.0
Performance fees retained (as a percent)	35.00%
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued performance fees	$ 141.6
Payment of performance fees	1.2
Accrued Liabilities And Other Liabilities
Accounting Policies [Abstract]
Accrued performance fees	37.1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued performance fees	$ 37.1