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GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Schedule of Intangible Assets and Goodwill [Line Items]    
Goodwill $ 2,642.8 $ 2,642.8
Total 2,888.2 2,917.0
Investment advisory agreements    
Schedule of Intangible Assets and Goodwill [Line Items]    
Definite-lived intangible assets - investment advisory agreements 97.1 125.9
Trade Names    
Schedule of Intangible Assets and Goodwill [Line Items]    
Indefinite-lived intangible assets - trade name 86.0 86.0
Investment advisory agreements    
Schedule of Intangible Assets and Goodwill [Line Items]    
Indefinite-lived intangible assets - trade name $ 62.3 $ 62.3