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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization expense | $ 28,900,000 |  | $ 31,000,000 | $ 87,100,000 | $ 95,000,000.0
Reallocation |  |  |  | 0 |
Goodwill impairment | 0 |  | 0 | 0 | 0
Secondaries Group |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Reallocation |  |  |  | 0 |
From Private Equity Group To Credit Group |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Reallocation |  | $ 55,700,000 |  |  |
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 |  |  | $ 8,900,000 |
Client relationships | Secondaries Group |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Non-cash impairment charges |  |  | $ 65,700,000 |  | $ 78,600,000

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