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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details)
€ in Millions, £ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
May 24, 2021
USD ($)
Sep. 30, 2023
USD ($)
loan
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
loan
Mar. 31, 2023
GBP (£)
loan
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2023
USD ($)
loan
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
extension
Mar. 31, 2023
GBP (£)
Mar. 31, 2023
EUR (€)
Dec. 31, 2021
USD ($)
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     $ 68,643,000       $ 65,383,000             $ 68,643,000   $ 65,383,000      
Amortized cost of loans in cost recovery     680,700,000       468,000,000             680,700,000   468,000,000      
Interest received for loans in cost recovery     $ 600,000         $ 2,100,000           $ 1,900,000 $ 2,600,000        
Number of loans | loan     3                     3          
Total carrying value, net     $ 7,974,031,000       8,681,990,000             $ 7,974,031,000   8,681,990,000      
Financing receivable, allowance for credit loss, excluding accrued interest     193,000,000       133,500,000             193,000,000   133,500,000      
Payment in kind interest     0         2,700,000           0 8,300,000        
Increase in Specific CECL Allowance, net   $ 10,000,000               $ (10,000,000)   $ 20,000,000              
Write-offs, specific CECL allowance, funded                           81,890,000   $ 7,000,000      
Realized gain on extinguishment of debt     (30,000)         0           (495,000) 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 $ 3,928,000   3,972,000 $ 4,834,000 4,695,000   4,347,000 2,812,000   3,999,000 $ 3,928,000     3,972,000 2,812,000 $ 4,347,000     $ 3,106,000
Proceeds from pre-payment penalties or accelerated fees     200,000         100,000           400,000 2,500,000        
Debt instrument, amortized cost basis         25,100,000                       £ 20.8    
Proceeds received from the repayment and sale of commercial mortgage loans                           749,716,000 1,316,431,000        
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                            
Nonoperating Income (Expense)                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Realized gain on extinguishment of debt     1,000,000                                
Commercial Mortgage and Subordinated Portfolio Segment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net     102,600,000       138,300,000             102,600,000   138,300,000      
Financing receivable, allowance for credit loss, excluding accrued interest 175,000,000   193,000,000 193,000,000 133,500,000   133,500,000 119,000,000   172,000,000 175,000,000     193,000,000 $ 119,000,000 133,500,000     $ 145,000,000
Increase in Specific CECL Allowance, net                           59,500,000          
Write-offs, specific CECL allowance, funded       81,980,000                              
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 | Mixed Use Property - London                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Total carrying value, net | £                                 £ 15.0    
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                          
Financing receivable, default interest rate               2.00%             2.00%        
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]     412,777,000       560,881,000             412,777,000   560,881,000      
Maximum exposure to loss             51,100,000                 $ 51,100,000      
Maximum exposure to loss, term                               1 year 4 months 24 days      
Residential-for-Sale - Manhattan, NY                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Write-offs, specific CECL allowance, funded             7,000,000     $ 7,000,000                  
Residential-for-Sale - Manhattan, NY | Commercial Mortgage and Subordinated Portfolio Segment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Increase in Specific CECL Allowance, net                     $ 30,000,000                
Office - London UK                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Proceeds from collection of loans receivable         88,400,000 £ 72.2                          
Proceeds from interest received         $ 700,000                            
Past Due 90                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Amortized cost of loans in cost recovery     $ 680,700,000       581,300,000             $ 680,700,000   $ 581,300,000      
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%                     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%                     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%                     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%                     15.00%          
Junior Mezzanine B Loan                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Increase in Specific CECL Allowance, net $ 30,000,000     $ 15,500,000     36,500,000                 $ 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%                     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%                     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     $ 383,000,000                     $ 383,000,000          
Mezzanine Loans                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Amortized cost of loans in cost recovery     169,881,000                     169,881,000          
Financing receivable, allowance for credit loss, excluding accrued interest     126,000,000                     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            
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                     169,881,000          
Financing receivable, allowance for credit loss, excluding accrued interest     $ 126,000,000                     $ 126,000,000          
Unfunded Loan Commitment                                      
Financing Receivable, Allowance for Credit Loss [Line Items]                                      
Off-balance sheet, credit loss, liability             $ 9,500,000                 $ 9,500,000      
[1] Includes $213,139 and $191,608 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.
[2] Net of $220,305 and $159,724 CECL Allowance in 2023 and 2022, respectively, comprised of $193,000 and $133,500 Specific CECL Allowance and $27,305 and $26,224 General CECL Allowance, respectively.