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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 7,864,803 | $ 8,384,575
General CECL Allowance | (34,192) | (26,482)
Carrying value, net | $ 7,830,611 | $ 8,358,093
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00%
General CECL allowance on unfunded commitments | $ 3,850 | $ 4,017
United Kingdom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 3,039,991 | $ 2,675,097
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 38.60% | 31.90%
New York City |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,607,723 | $ 1,736,856
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 20.40% | 20.70%
Other Europe |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,335,497 | $ 1,686,425
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 17.00% | 20.10%
Germany |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 8.00% | 7.40%
Italy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.30% | 4.90%
Spain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.40% | 4.20%
Sweden |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.10% | 2.90%
Ireland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio |  | 0.50%
Netherlands |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 0.20% | 0.20%
Southeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 611,661 | $ 535,054
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.80% | 6.40%
West |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 509,901 | $ 484,842
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.50% | 5.80%
Midwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 408,949 | $ 522,137
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.20% | 6.20%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 351,081 | $ 744,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.50% | 8.90%
Percentage of Portfolio | 1.20% | 1.10%
Northeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 0.10% | 5.00%
Southwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.50% | 1.70%
Mid-Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.70% | 1.10%
Hotel |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,620,910 | $ 2,128,256
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 20.60% | 25.40%
Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,792,187 | $ 1,593,320
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 22.80% | 19.00%
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,454,077 | $ 1,407,764
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 18.50% | 16.80%
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,220,115 | $ 1,247,238
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 15.50% | 14.90%
Mixed Use |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 433,252 | $ 679,303
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.50% | 8.10%
Health Care |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 355,474 | $ 511,803
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.50% | 6.10%
Industrial Property |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 418,218 | $ 293,133
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.30% | 3.50%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 570,570 | $ 523,758
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.30% | 6.20%
Pubs |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.90% |
Parking Garage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio |  | 2.30%
Caravan Park |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.70% | 2.40%
Urban Predevelopment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.70% | 1.50%

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