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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Intangible Assets and Goodwill [Line Items]      
Goodwill $ 2,642.8 $ 2,642.8 $ 2,693.2
Total 3,150.1 3,272.6  
Investment advisory agreements      
Schedule of Intangible Assets and Goodwill [Line Items]      
Definite-lived intangible assets - investment advisory agreements 324.6 447.1  
Trade Names      
Schedule of Intangible Assets and Goodwill [Line Items]      
Indefinite-lived intangible assets - trade name 117.1 117.1  
Investment advisory agreements      
Schedule of Intangible Assets and Goodwill [Line Items]      
Indefinite-lived intangible assets - trade name $ 65.6 $ 65.6