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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Goodwill | $ 2,642.8 | $ 2,642.8
Total | 3,085.1 | 3,150.1
Trade Name |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 104.8 | 117.1
Investment Advisory Agreements |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 65.6 | 65.6
Investment Advisory Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite-lived intangible assets - investment advisory agreements | $ 271.9 | $ 324.6

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