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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 2,642.8 $ 2,642.8
Total 3,185.2 3,272.6
Trade Name    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 117.1 117.1
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 $ 359.7 $ 447.1