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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details)
€ in Millions, £ in Millions
 3 Months Ended 12 Months Ended
May 24, 2021
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
loan
Mar. 31, 2023
GBP (£)
loan
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
extension
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2023
GBP (£)
Mar. 31, 2023
EUR (€)
Nov. 30, 2020
USD ($)
Nov. 30, 2020
GBP (£)
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Mortgage loans on real estate, commercial and consumer, percentage of portfolio                         100.00% 100.00%          
Interest receivable           $ 65,383,000             $ 72,354,000 $ 65,383,000          
Amortized cost of loans in cost recovery           468,000,000             693,700,000 468,000,000          
Interest received for loans in cost recovery                         $ 2,500,000 3,200,000          
Debt Instrument, Extension Term                         2 years            
Number of loans | loan                         3            
Total carrying value, net           8,681,990,000             $ 8,358,093,000 8,681,990,000          
Financing receivable, allowance for credit loss, excluding accrued interest           133,500,000             193,000,000 133,500,000          
Increase in Specific CECL Allowance, net $ 10,000,000           $ (10,000,000)       $ 20,000,000   (11,500,000)            
Write-offs, specific CECL allowance, funded                         81,890,000 7,000,000          
Gain on extinguishment of debt                         (495,000) 0 $ 0        
Allowance for credit loss, current                 $ 7,000,000       7,000,000            
Number of extensions available | extension                 2                    
Financing receivable, loan specific, realized gain (loss) on writeoff       $ 7,000,000                              
Off-balance sheet, credit loss, liability           4,347,000       $ 3,106,000     4,017,000 4,347,000 3,106,000        
Payment in kind interest                         0 10,000,000.0 47,700,000        
Proceeds from pre-payment penalties or accelerated fees                         400,000 3,800,000 1,500,000        
Debt instrument, shared appreciation fees                             3,700,000        
Loans and leases receivable, gain (loss) on sales, net                         (86,604,000) 24,894,000          
Proceeds received from the repayment and sale of commercial mortgage loans                         1,093,181,000 1,874,933,000 1,509,428,000        
Sale of Mezzanine Loan                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net           100,000,000       41,900,000       100,000,000 41,900,000        
Loans and leases receivable, gain (loss) on sales, net                             800,000        
Hotel Through a Died-in-Lieu Foreclosure                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, loan specific, realized gain (loss) on writeoff       4,800,000                              
Urban Retail                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net                                   $ 422,700,000 £ 309.2
Nonoperating Income (Expense)                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Gain on extinguishment of debt   $ 1,000,000                                  
Residential-for-Sale - Manhattan, NY                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Increase in Specific CECL Allowance, net                         66,500,000            
Write-offs, specific CECL allowance, funded           7,000,000     $ 7,000,000                    
Past Due 90                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Amortized cost of loans in cost recovery           581,300,000             693,700,000 581,300,000          
Commercial Mortgage and Subordinated Portfolio Segment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Expense (Reversal)                         (72,000) (6,123,000)          
Total carrying value, net           138,300,000             95,500,000 138,300,000          
Financing receivable, allowance for credit loss, excluding accrued interest           133,500,000       145,000,000     193,000,000 133,500,000 145,000,000        
Increase in Specific CECL Allowance, net                         59,500,000            
Write-offs, specific CECL allowance, funded   $ 82,000,000.0 $ 82,000,000                   $ 81,980,000 24,896,000          
Loans and leases receivable, gain (loss) on sales, net       $ 200,000                              
Number of commercial mortgage loans | loan       3 3                            
Commercial Mortgage and Subordinated Portfolio Segment | Urban Retail                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net                                   $ 338,400,000 £ 247.5
Commercial Mortgage and Subordinated Portfolio Segment | Mixed Use Property - London                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net | £                               £ 15.0      
Financing receivable, default interest rate                         2.00%            
Off-balance-sheet, credit loss, liability, transfers             327,700,000 £ 293.4                      
Loans and leases receivable, gain (loss) on sales, net             $ 0                        
Proceeds received from the repayment and sale of commercial mortgage loans       $ 18,200,000 £ 15.0                            
Commercial Mortgage and Subordinated Portfolio Segment | Various Properties In Europe                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net       219,000,000                         € 205.7    
Mortgage loans on real estate, commercial and consumer, funded, net       $ 122,400,000                         € 115.0    
Subordinate Mortgage Portfolio Segment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net [1],[2]           560,881,000             $ 432,734,000 560,881,000          
Maximum exposure to loss           51,100,000               $ 51,100,000          
Maximum exposure to loss, term                           1 year 4 months 24 days          
Subordinate Mortgage Portfolio Segment | Residential Real Estate                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Loans and leases receivable, gain (loss) on sales, net                   0                  
Debt related to real estate owned, held for sale                   $ 31,200,000         $ 31,200,000        
Floating Rate Loan                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Mortgage loans on real estate, commercial and consumer, percentage of portfolio                         99.00% 98.00%          
Senior Mezzanine Loans | Secured Overnight Financing Rate (SOFR)                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, basis spread on variable rate                         15.70%            
Senior Mezzanine Loans | Secured Overnight Financing Rate                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, basis spread on variable rate                         9.00%            
Junior Mezzanine A Loan                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Increase in Specific CECL Allowance, net     126,000,000                                
Junior Mezzanine A Loan | Secured Overnight Financing Rate (SOFR)                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, basis spread on variable rate                         22.50%            
Junior Mezzanine A Loan | Secured Overnight Financing Rate                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, basis spread on variable rate                         15.00%            
Junior Mezzanine B Loan                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Increase in Specific CECL Allowance, net     $ 15,500,000                     $ 66,500,000          
Junior Mezzanine B Loan | Secured Overnight Financing Rate (SOFR)                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, basis spread on variable rate                         17.50%            
Junior Mezzanine B Loan | Secured Overnight Financing Rate                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Financing receivable, basis spread on variable rate                         15.00%            
Senior and Junior Mezzanine Loans                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Mortgage loans on real estate, commercial and consumer, percentage of portfolio                         4.80%            
Total carrying value, net                         $ 402,900,000            
Mezzanine Loans                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Amortized cost of loans in cost recovery                         169,881,000            
Financing receivable, allowance for credit loss, excluding accrued interest                         126,000,000            
Mezzanine Loans | Residential-for-Sale - Manhattan, NY                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Amortized cost of loans in cost recovery                         169,881,000            
Financing receivable, allowance for credit loss, excluding accrued interest                         126,000,000            
Mezzanine Loans | Subordinate Mortgage Portfolio Segment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Increase in Specific CECL Allowance, net                       $ 10,000,000              
Unfunded Loan Commitment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Off-balance sheet, credit loss, liability           $ 9,500,000             $ 0 $ 9,500,000          
[1] Includes $232,991 and $191,608 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.
[2] Net of $219,482 and $159,724 CECL Allowance comprised of $193,000 and $133,500 Specific CECL Allowance and $26,482 and $26,224 General CECL Allowance in 2023 and 2022, respectively.