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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Intangible Asset, Acquired, Finite-Lived [Line Items]        
Amortization expense $ 52,300,000 $ 28,900,000 $ 142,300,000 $ 87,100,000
Goodwill impairment 0 0 0 0
Management contracts        
Intangible Asset, Acquired, Finite-Lived [Line Items]        
Fully amortized intangibles, amount removed during the period     40,600,000  
Management contracts | Credit Group        
Intangible Asset, Acquired, Finite-Lived [Line Items]        
Non-cash impairment charges $ 2,300,000   $ 2,300,000  
Management contracts | Credit Group, Real Assets Group and Secondaries Group        
Intangible Asset, Acquired, Finite-Lived [Line Items]        
Non-cash impairment charges   $ 8,900,000   $ 8,900,000