GOODWILL AND INTANGIBLE ASSETS - Schedule of Definite-Lived Intangible Assets, Future Amortization Expense (Details) - Investment Advisory Agreements $ in Millions	Sep. 30, 2025 USD ($)
Finite-Lived Intangible Assets [Line Items]
Remaining 2025	$ 20.4
2026	54.6
2027	39.1
2028	11.8
2029	$ 8.8

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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