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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Intangible Assets and Goodwill [Line Items]    
Goodwill $ 2,642.8 $ 2,642.8
Total 3,010.9 3,150.1
Investment advisory agreements    
Schedule of Intangible Assets and Goodwill [Line Items]    
Definite-lived intangible assets - investment advisory agreements 216.5 324.6
Trade Names    
Schedule of Intangible Assets and Goodwill [Line Items]    
Indefinite-lived intangible assets - trade name 86.0 117.1
Investment advisory agreements    
Schedule of Intangible Assets and Goodwill [Line Items]    
Indefinite-lived intangible assets - trade name $ 65.6 $ 65.6