GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Intangible Asset, Acquired, Finite-Lived [Line Items]
Depreciation and amortization expense			$ 193,400,000	$ 116,300,000	$ 126,000,000.0
Acquisitions			2,285,242,000	39,696,000
Reallocation				0
Goodwill impairment			0	0
Walton Street Capital Mexico
Intangible Asset, Acquired, Finite-Lived [Line Items]
Acquisitions	$ 28,400,000
Credit Group
Intangible Asset, Acquired, Finite-Lived [Line Items]
Acquisitions			0	0
Reallocation				55,658,000
Secondaries Group
Intangible Asset, Acquired, Finite-Lived [Line Items]
Acquisitions			0	0
Reallocation				0
From Private Equity Group To Credit Group
Intangible Asset, Acquired, Finite-Lived [Line Items]
Reallocation		$ 55,700,000
Management contracts
Intangible Asset, Acquired, Finite-Lived [Line Items]
Fully amortized intangibles, amount removed during the period			40,600,000
Management contracts | Credit Group
Intangible Asset, Acquired, Finite-Lived [Line Items]
Non-cash impairment charges			$ 2,300,000
Impairment Of Intangible Asset Finite Lived, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag			General, administrative and other expenses
Management contracts | Credit Group, Real Assets Group and Secondaries Group
Intangible Asset, Acquired, Finite-Lived [Line Items]
Non-cash impairment charges				$ 8,900,000
Impairment Of Intangible Asset Finite Lived, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag				General, administrative and other expenses
Client relationships | Secondaries Group
Intangible Asset, Acquired, Finite-Lived [Line Items]
Non-cash impairment charges					$ 78,700,000
Impairment Of Intangible Asset Finite Lived, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag					General, administrative and other expenses