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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 2,652.4 $ 2,643.9 $ 2,693.2
Total 3,511.5   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 $ 559.6   $ 613.9