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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 29, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) loan | Mar. 31, 2023 GBP (£) loan | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2023 GBP (£) | Mar. 31, 2023 EUR (€)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  | 100.00% |  |  |  |  |  | 100.00% |  |  |
Amortized cost of loans in cost recovery |  | $ 556,000 |  |  |  |  |  | $ 693,700 |  |  |
Interest received for loans in cost recovery |  | $ 600 |  | $ 700 |  |  |  |  |  |  |
Debt instrument, extension term |  | 2 years |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  | $ (10,000) | $ 20,000 |  |  |  |
Write-offs, specific CECL allowance, funded |  | $ 0 |  |  |  |  |  | 81,890 |  |  |
Interest income from subordinate loans and other lending assets |  | 849 |  | 9,707 |  |  |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  | 100 |  | 0 |  |  |  |  |  |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  | 168,526 |  | 435,442 |  |  |  |  |  |  |
Valuation allowance, commercial mortgage loan held for sale |  | 679 |  | 0 |  |  |  |  |  |  |
Gain on extinguishment of debt |  | $ 0 |  | (213) |  |  |  |  |  |  |
Debt instrument, extension option |  | 6 months |  |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | (200) |  |  |  |  |  |  |
Office - London, United Kingdom |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from collection of loans receivable |  |  |  | 88,400 | £ 72.2 |  |  |  |  |  |
Proceeds from interest received |  |  |  | 700 |  |  |  |  |  |  |
Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan, mortgage, held-for-sale, price percentage |  | 99.50% |  |  |  |  |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | $ 556,000 |  |  |  |  |  | 693,700 |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan and lease losses, real estate and off-balance sheet, credit loss, expense (reversal) |  | 5,684 |  | 4,391 |  |  |  |  |  |  |
Increase in current expected credit loss allowance, net |  | 142,000 |  | $ 0 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | 83,500 |  |  |  |  |  | 95,500 |  |  |
Increase in Specific CECL Allowance, net |  | $ 142,000 |  |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  | $ 82,000 |  |  |  |  |  |  |  |
Number of commercial mortgage loans | loan |  |  |  | 3 | 3 |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  | $ 200 |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Various Properties In Europe |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  | 219,000 |  |  |  |  |  |  | € 205.7
Mortgage loans on real estate, commercial and consumer, funded, net |  |  |  | 122,400 |  |  |  |  |  |  | € 115.0
Commercial Mortgage and Subordinated Portfolio Segment | Mixed Use Property - London |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | £ |  |  |  |  |  |  |  |  |  | £ 15.0 |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  | 18,200 | £ 15.0 |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  | 99.00% |  |  |  |  |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | $ 27,881 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | $ 534,800 |  |  |  |  |  | $ 674,500 |  |  |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  | 6.40% |  |  |  |  |  | 8.00% |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  | $ 66,500 |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  | $ 126,000 |  |  |  |  |  |  |  |
Mortgage, Amortized cost |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | $ 99,301 |  |  |  |  |  |  |  |  |
Mortgage, Amortized cost | Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loan, held for sale |  | $ 135,500 |  |  |  |  |  |  |  |  |
Mortgage, Amortized cost | Hotel - Honolulu, Hi | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net | $ (700) |  |  |  |  |  |  |  |  |  |
Securitization Vehicle |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income from subordinate loans and other lending assets |  |  |  | $ 1,200 |  |  |  |  |  |  |
Senior Loans | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from (repayments of) secured debt | $ 108,300 |  |  |  |  |  |  |  |  |  |

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