GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)		3 Months Ended			12 Months Ended
	Dec. 01, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment Of Intangible Asset Finite Lived, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag					non-cash impairment charge
Amortization expense					$ 116,300,000	$ 126,000,000.0	$ 133,600,000
Purchase price allocated to goodwill					39,696,000	124,414,000
Reallocation					0	0
Goodwill impairment					0	0
Secondaries Group
Acquired Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charges							$ 181,600,000
Purchase price allocated to goodwill					0	0
Reallocation					0	0
From Private Equity Group To Credit Group
Acquired Finite-Lived Intangible Assets [Line Items]
Reallocation		$ 55,700,000
Credit Group
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price allocated to goodwill					0	0
Reallocation				$ 224,600,000	55,658,000	224,587,000
Management contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Fully amortized intangibles, amount removed during the period					47,500,000
Management contracts | Credit Group, Real Assets Group and Secondaries Group
Acquired Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charges					8,900,000
Client relationships | Secondaries Group
Acquired Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charges						$ 78,700,000
Walton Street Capital Mexico
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price allocated to goodwill					$ 28,400,000
Walton Street Capital Mexico | Management contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 27,000,000
Acquired finite lived intangible assets useful life	6 years 8 months 12 days
Walton Street Capital Mexico | Client relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 9,800,000
Acquired finite lived intangible assets useful life	10 years
Crescent Point Capital
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price allocated to goodwill			$ 124,400,000