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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
COMMITMENTS AND CONTINGENCIES            
Unfunded capital commitments $ 1,513,600,000   $ 1,513,600,000     $ 1,451,400,000
Maximum exposure from guarantees 183,500,000   183,500,000     1,100,000
Carried interest, contingent repayment obligations 0   0     0
Other Operating Income (Expense)            
COMMITMENTS AND CONTINGENCIES            
Contingent arrangements, other expense $ 400,000   $ 2,800,000      
Minimum            
COMMITMENTS AND CONTINGENCIES            
Service period     3 years      
Lease terms 1 year   1 year      
Maximum            
COMMITMENTS AND CONTINGENCIES            
Service period     6 years      
Lease terms 18 years   18 years      
Performance income            
COMMITMENTS AND CONTINGENCIES            
Performance income subject to potential clawback provision $ 125,500,000   $ 125,500,000     59,600,000
Performance income subject to potential claw back provision that are reimbursable by professionals 99,700,000   99,700,000     39,500,000
Accounts Payable and Accrued Liabilities            
COMMITMENTS AND CONTINGENCIES            
Contingent consideration 20,400,000   20,400,000     17,600,000
GCP International | DC Earnout            
COMMITMENTS AND CONTINGENCIES            
Maximum exposure from contingent arrangements 1,000,000,000   1,000,000,000      
GCP International | Japan Earnout            
COMMITMENTS AND CONTINGENCIES            
Maximum exposure from contingent arrangements 500,000,000   $ 500,000,000      
GCP International | DC Earnout And Japan Earnout            
COMMITMENTS AND CONTINGENCIES            
Contingent consideration, liability, paid in cash (as a percent)     15.00%      
GCP International | DC Earnout And Japan Earnout | Other Operating Income (Expense)            
COMMITMENTS AND CONTINGENCIES            
Contingent consideration 17,000,000   $ 42,500,000      
GCP International | DC Earnout And Japan Earnout | Due to Affiliates            
COMMITMENTS AND CONTINGENCIES            
Contingent consideration         $ 465,100,000  
GCP International | DC Earnout And Japan Earnout | Accounts Payable and Other Accrued Liabilities            
COMMITMENTS AND CONTINGENCIES            
Contingent consideration 507,600,000   507,600,000      
GCP International | Earnout Arrangement And Management Incentive Program            
COMMITMENTS AND CONTINGENCIES            
Deferred compensation expense 14,700,000   32,700,000      
GCP International | Earnout Arrangement And Management Incentive Program | Accrued Compensation            
COMMITMENTS AND CONTINGENCIES            
Contingent consideration 217,500,000   217,500,000      
Other Arrangements            
COMMITMENTS AND CONTINGENCIES            
Maximum exposure from contingent arrangements 215,000,000   215,000,000     155,000,000
Contingent consideration 124,100,000   124,100,000     99,600,000
Contingent arrangements, amount accrued 58,700,000   58,700,000     $ 29,900,000
Compensation expense $ 10,100,000 $ 5,400,000 $ 28,800,000 $ 16,400,000