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Variable Interest Entities - Narrative (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Variable interest entities        
VIE assets $ 63,183,357,000 $ 62,556,497,000    
VIE liabilities 55,693,851,000 55,363,025,000    
Temporary Equity: Redeemable non-controlling interests 364,118,000 426,695,000 $ 414,348,000 $ 362,790,000
Investments in unconsolidated entities $ 84,752,000 $ 99,370,000    
CMBS JV        
Variable interest entities        
Subsidiary, ownership percentage, parent 51.00%      
Primary beneficiary        
Variable interest entities        
VIE assets $ 86,600,000      
Primary beneficiary | CMBS Venture Holdings        
Variable interest entities        
VIE assets 219,500,000      
VIE liabilities 53,500,000      
Primary beneficiary | SPT Dolphin        
Variable interest entities        
VIE assets 1,800,000,000      
VIE liabilities 0      
Primary beneficiary | Woodstar Feeder Fund, L.P.        
Variable interest entities        
VIE assets 500,000,000      
Temporary Equity: Redeemable non-controlling interests 400,000,000      
Not primary beneficiary        
Variable interest entities        
Maximum risk of loss related to VIEs, on fair value basis 32,500,000      
Not primary beneficiary | Measurement Period Adjustments        
Variable interest entities        
Investments in unconsolidated entities 6,300,000      
Not primary beneficiary | Securitization SPEs        
Variable interest entities        
Long term debt, gross $ 4,600,000,000