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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Specific CECL allowance $ 193,000,000 $ 133,500,000  
Amortized cost $ 693,700,000 468,000,000  
Equity contribution rate 90.00%    
Payment in kind interest $ 0 10,000,000.0 $ 47,700,000
Turner Consulting      
Financing Receivable, Credit Quality Indicator [Line Items]      
Equity contribution rate 10.00%    
Retail Center - Cincinnati, OH      
Financing Receivable, Credit Quality Indicator [Line Items]      
Payment in kind interest $ 2,500,000 $ 1,800,000  
Retail Center - Cincinnati, OH | Capitalization Rate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loan collateral, measurement input 0.090    
Residential-for-Sale - Manhattan, NY | Discount Rate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loan collateral, measurement input 0.10    
Mortgage, Amortized cost      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance $ 166,890,000    
Specific CECL allowance 67,000,000    
Amortized cost 99,890,000    
Mortgage, Amortized cost | Retail Center - Cincinnati, OH      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 166,890,000    
Specific CECL allowance 67,000,000    
Amortized cost 99,890,000    
Mezzanine Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 295,881,000    
Specific CECL allowance 126,000,000    
Amortized cost 169,881,000    
Mezzanine Loans | Residential-for-Sale - Manhattan, NY      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 295,881,000    
Specific CECL allowance 126,000,000    
Amortized cost 169,881,000    
Real Estate and Mezzanine      
Financing Receivable, Credit Quality Indicator [Line Items]      
Amortized cost prior to Specific CECL Allowance 462,771,000    
Specific CECL allowance 193,000,000    
Amortized cost $ 269,771,000