GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment loss	$ 0	$ 0	$ 0
Indefinite-Lived Intangible Assets [Line Items]
Goodwill impairment loss	0	0	0
Impairment of intangible assets	$ 3,300,000	$ 31,100,000	$ 0
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]	Acquisition-related amortization and impairment costs	Acquisition-related amortization and impairment costs	Acquisition-related amortization and impairment costs
Investment advisory agreements
Indefinite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 90,600,000	$ 108,100,000	$ 122,500,000
Investment advisory agreements
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 3,300,000
Trade Names
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets		$ 31,100,000