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EQUITY COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
installment
$ / shares
shares
Sep. 30, 2024
shares
Jan. 01, 2025
shares
Dec. 31, 2024
$ / shares
shares
Equity compensation        
Vesting period 5 years      
Class A Common Stock        
Equity compensation        
Shares delivered in period (in shares) 2,900,000 2,200,000    
Restricted Stock Units (RSUs)        
Equity compensation        
Shares delivered in period (in shares) 5,200,000 4,000,000.0    
Cost not yet recognized | $ $ 1,683.5      
Cost not yet recognized, period for recognition 3 years 4 months 24 days      
Granted (in shares) 7,377,644      
Vested (in shares) 5,158,943      
Remaining nonvested (in shares) 19,972,596     17,968,940
Weighted average grant date fair value (in dollars per share) | $ / shares $ 118.14     $ 79.11
AOG Unit awards        
Equity compensation        
Cost not yet recognized | $ $ 29.3      
Cost not yet recognized, period for recognition 2 years 4 months 24 days      
Granted (in shares) 300,000      
Vested (in shares) 100,000      
Remaining nonvested (in shares) 200,000      
Number of installments | installment 3      
Weighted average grant date fair value (in dollars per share) | $ / shares $ 170.94      
Ares Management L.P        
Equity compensation        
Total number of shares available for grant under the equity incentive plan (in shares) 44,089,959   51,846,506