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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Intangible Assets and Goodwill [Line Items]    
Goodwill $ 2,642.8 $ 2,642.8
Total 2,986.5 3,010.9
Investment Advisory Agreements    
Schedule of Intangible Assets and Goodwill [Line Items]    
Definite-lived intangible assets - investment advisory agreements 192.1 216.5
Trade Name    
Schedule of Intangible Assets and Goodwill [Line Items]    
Indefinite-lived intangible assets 86.0 86.0
Investment Advisory Agreements    
Schedule of Intangible Assets and Goodwill [Line Items]    
Indefinite-lived intangible assets $ 65.6 $ 65.6