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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]          
Amortization expense $ 28,900,000   $ 31,000,000 $ 87,100,000 $ 95,000,000.0
Reallocation       0  
Goodwill impairment 0   0 0 0
Secondaries Group          
Acquired Finite-Lived Intangible Assets [Line Items]          
Reallocation       0  
From Private Equity Group To Credit Group          
Acquired Finite-Lived Intangible Assets [Line Items]          
Reallocation   $ 55,700,000      
Management contracts          
Acquired Finite-Lived Intangible Assets [Line Items]          
Fully amortized intangibles, amount removed during the period       47,500,000  
Management contracts | Credit Group, Real Assets Group and Secondaries Group          
Acquired Finite-Lived Intangible Assets [Line Items]          
Non-cash impairment charges $ 8,900,000     $ 8,900,000  
Client relationships | Secondaries Group          
Acquired Finite-Lived Intangible Assets [Line Items]          
Non-cash impairment charges     $ 65,700,000   $ 78,600,000