DEBT OBLIGATIONS, NET - Revolving Credit Facility (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Jun. 15, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Aggregate facility size	$ 2,565,000,000		$ 1,690,000,000
Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Aggregate facility size	$ 1,115,000,000	$ 1,100,000,000	$ 640,000,000
Average interest rate (percent)	5.10%		2.57%
Maximum net leverage ratio	3.5
Maximum cash and cash equivalents amount used in net leverage ration calculation	$ 500,000,000
Minimum level of fee-paying assets under management	$ 50,500,000,000
New fee-paying assets under management, percentage	70.00%
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Fee on unused portion of credit facility	0.125%
Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Fee on unused portion of credit facility	0.375%
Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility | Minimum | Variable Alternative Rate, Option Two
Line of Credit Facility [Line Items]
Variable rate	1.25%
Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility | Minimum | Adjusted-Term, Alternative Rate
Line of Credit Facility [Line Items]
Variable rate	0.25%
Adjusted-term financing rate	1.00%
Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility | Maximum | Variable Alternative Rate, Option Two
Line of Credit Facility [Line Items]
Variable rate	1.875%
Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility | Maximum | Adjusted-Term, Alternative Rate
Line of Credit Facility [Line Items]
Variable rate	0.875%
Revolving Credit Facility | Line of Credit | New York Fed Bank Rate | Revolving Credit Facility | Adjusted-Term, Alternative Rate
Line of Credit Facility [Line Items]
Variable rate	0.50%