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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) Loan | Dec. 31, 2023 GBP (£) Loan | Dec. 31, 2022 USD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 GBP (£) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% | 100.00% |  |  |  |  |  |  |
Interest receivable |  |  | $ 58,470,000 |  |  |  |  |  |  | $ 58,470,000 |  | $ 72,354,000 |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  |  |  |  |  | Secured Overnight Financing Rate [Member] |  |  |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss, aggregate reserve |  |  | 30,836,000 |  |  |  |  |  |  | $ 30,836,000 |  | 26,482,000 |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  |  |  |  |  |  |  |  |  |  | 59,500,000 |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 486,800,000 |  |  |  |  |  |  | 486,800,000 |  | 693,700,000 |  |  |  |  |  |  |  |
Interest received for loans in cost recovery |  |  |  |  |  |  |  |  |  | 9,100,000 |  | 2,500,000 |  | $ 3,200,000 |  |  |  |  |  |
Unfunded commitments |  |  | 5,948,000 |  |  |  |  |  |  | 5,948,000 |  | 4,017,000 |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  | 7,104,156,000 | [1] |  |  |  |  |  | 7,104,156,000 | [1] | 8,358,093,000 |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,500,000) |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  |  |  |  | 127,512,000 |  | 81,890,000 |  |  |  |  |  |  |  |
Interest income from subordinate loans and other lending assets |  |  |  |  |  |  |  |  |  | 3,542,000 |  | 17,280,000 |  | 55,590,000 |  |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 10,000,000 |  |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  |  |  |  |  | 7,400,000 |  | 400,000 |  | 3,800,000 |  |  |  |  |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  |  |  |  |  |  | 2,426,276,000 |  | 1,093,181,000 |  | 1,874,933,000 |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net | [2] |  |  |  |  |  |  |  |  | $ (128,191,000) |  | (86,604,000) |  | (24,894,000) |  |  |  |  |  |
Sale Of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  | 100,000,000 |  |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 422,700,000 | £ 309.2
Office - London, United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from interest received |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |
Office Property - New York City |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rate |  |  |  |  |  | 3.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  | $ (700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan, mortgage, held-for-sale, price percentage |  |  |  |  |  | 99.50% |  |  |  | 99.50% |  |  |  |  |  |  |  |  |  |
Massachusetts Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  | 133,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from commonwealth for hospital and distributed allocation |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method interest in joint venture |  |  | 20,100,000 |  |  |  |  |  |  | $ 20,100,000 |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  | $ (127,500,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential - Manhattan, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 486,800,000 |  |  |  |  |  |  | 486,800,000 |  | 693,700,000 |  |  |  |  |  |  |  |
Promissory Note | Massachusetts Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  | 41,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General CECL allowance increase (decrease) |  |  |  |  |  |  |  |  |  | 6,300,000 |  | (100,000) |  |  |  |  |  |  |  |
Increase in current expected credit loss allowance, net |  |  |  |  |  |  | $ 142,000,000 |  |  | 277,012,000 |  | 141,480,000 |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss, aggregate reserve |  |  | 342,500,000 |  |  |  |  | 133,500,000 |  | 342,500,000 |  | 193,000,000 |  | 133,500,000 |  |  |  |  |  |
Specific CECL allowance increased |  |  |  |  |  |  |  |  |  | 149,500,000 |  |  |  |  |  |  |  |  |  |
Unfunded commitments |  |  | 10,600,000 |  |  |  |  |  |  | 10,600,000 |  | 10,600,000 |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  | 8,300,000 |  |  |  |  |  |  | 8,300,000 |  | 95,500,000 |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  |  |  |  | $ 127,512,000 |  | $ 81,980,000 |  | 24,900,000 |  |  |  |  |  |
Number of commercial mortgage loans | Loan |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 219,000,000 |  |  |  |  | € 205.7 |  |  |
Mortgage loans on real estate, commercial and consumer, funded, net |  |  |  |  |  |  |  |  |  |  |  | 122,400,000 |  |  |  |  | € 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 |  |  |  |  |  |  |  | $ 327,700,000 |  |  |  |  |  | $ 327,700,000 |  | £ 15.0 |  | £ 293.4 |  |
Financing receivable, default interest rate |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  | 2.00% |  |  |  | 2.00% |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  |  |  |  |  |  |  |  | $ 18,200,000 | £ 15.0 |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Off-balance-sheet credit loss liability transfers |  |  |  |  |  |  |  |  |  |  |  |  |  | 327,700,000 | £ 293.4 |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 338,400,000 | £ 247.5
Commercial Mortgage and Subordinated Portfolio Segment | Massachusetts Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage representing original whoile loan amount |  |  |  |  | 41.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  |  |  | $ 127,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific allowance for credit loss on original loan amount |  |  |  |  | $ 378,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Michigan Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  |  |  |  | $ 7,500,000 | 142,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Specific allowance for credit loss reserve on amortized cost basis |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Residential - Manhattan, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss, aggregate reserve |  |  |  |  |  |  | $ 268,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 95.00% |  | 99.00% | 99.00% |  |  |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  | 721,700,000 |  |  |  |  |  |  | $ 721,700,000 |  | $ 674,500,000 |  |  |  |  |  |  |  |
Mezzanine Loans | Residential - Manhattan, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, allowance for credit loss, aggregate reserve |  |  | $ 268,000,000 |  |  |  |  |  |  | $ 268,000,000 |  |  |  |  |  |  |  |  |  |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 10.10% |  | 0.00% | 0.00% |  |  |  |  |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,500,000 |  |  |  |  |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  | $ 126,000,000 |  |  |  |  |  |  |  |
Mortgage, Amortized cost | Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  |  |  |  |  | $ (700,000) |  |  |  |  |  |  |  |  |  |
Securitization Vehicle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income from subordinate loans and other lending assets |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |  | $ 3,600,000 |  |  |  |  |  |
Senior Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from (repayments of) secured debt |  |  |  |  |  | $ 108,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cleveland Multifamily |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rate |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, extension term |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
[1] | Excludes Note receivable, held for sale with an outstanding principal and carrying value of $41.2 million.
[2] | During the year ended December 31, 2024, we recorded a $128.2 million net realized loss on investments, consisting of (i) a $127.5 million realized loss related to the extinguishment of the Massachusetts Healthcare Loan and (ii) a $0.7 million realized loss related to the sale of a commercial mortgage loan collateralized by a hotel property located in Honolulu, HI, which was sold at a price of 99.5%. During the year ended December 31, 2023, we recorded a $86.6 million realized loss on investments comprised of (i) a $4.8 million realized loss related to the acquisition of the Atlanta Hotel through a deed-in-lieu of foreclosure and (ii) a $82.0 million realized loss representing a write-off of previously recorded Specific CECL Allowance on one of our subordinate loans secured by an ultra-luxury residential property in Manhattan, NY. These losses were partially offset by a $0.2 million gain on investments recorded in connection with the sale of our entire interest in three commercial loans secured by properties in Europe and a partial interest in one commercial loan secured by property located in London, United Kingdom. During the year ended December 31, 2022, we recorded a $24.9 million realized loss on investments represented with a write-off of a previously recorded Specific CECL Allowance comprised of (i) a $17.9 million loss on a first mortgage loan secured by an urban predevelopment property following the sale of the underlying property, and (ii) a $7.0 million loss, related to a first mortgage secured by the Atlanta hotel in anticipation of consensual foreclosure in the first quarter of 2023.

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