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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Indefinite-lived intangible assets |  |
Intangible assets weighted average useful life |  | 6 years 6 months
Investment advisory agreements |  |
Indefinite-lived intangible assets |  |
Intangible assets weighted average useful life | 5 years 6 months |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | $ 613.9 | $ 613.9
Accumulated amortization & impairments | (289.3) | (166.8)
Net carrying amount | $ 324.6 | $ 447.1

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