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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Goodwill | $ 2,643.9 | $ 2,693.2
Total | 3,530.2 | 3,606.6
Trade Name |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 134.7 | 134.7
Investment Advisory Agreements |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 164.8 | 164.8
Investment Advisory Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite-lived intangible assets - investment advisory agreements | $ 586.8 | $ 613.9

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