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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.

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