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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, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 8,342,902 | $ 7,134,992
General CECL Allowance | (39,257) | (30,836)
Mortgage Loans on Real Estate, Commercial and Consumer, Net, Total | $ 8,303,645 | $ 7,104,156
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00%
General CECL allowance on unfunded commitments | $ 5,782 | $ 5,948
United Kingdom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 2,548,921 | $ 2,423,856
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 30.50% | 33.90%
New York City |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,412,227 | $ 1,539,995
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 16.90% | 21.60%
Other Europe |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,175,077 | $ 1,265,344
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 14.10% | 17.70%
Germany |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 8.30% | 8.40%
Italy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.30% | 2.40%
Spain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio |  | 3.50%
Sweden |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.20% | 3.10%
Netherlands |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 0.30% | 0.30%
Southeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 888,876 | $ 511,742
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 10.70% | 7.20%
West |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 807,665 | $ 489,008
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.70% | 6.90%
Midwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 751,192 | $ 560,436
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.00% | 7.90%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 758,944 | $ 344,611
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.10% | 4.80%
Percentage of Portfolio | 1.20% | 1.30%
Northeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.40% | 0.60%
Southwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.10% | 1.50%
Mid-Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.40% | 1.40%
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 2,545,682 | $ 1,556,819
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 30.50% | 21.80%
Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 2,040,028 | $ 1,756,965
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 24.50% | 24.60%
Hotel |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,459,879 | $ 1,575,270
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 17.50% | 22.10%
Industrial Property |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 832,824 | $ 399,546
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 10.00% | 5.60%
Data Centers |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 445,539 |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.30% | 0.00%
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 359,497 | $ 946,017
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.30% | 13.30%
Mixed Use |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 304,376 | $ 363,211
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 3.60% | 5.10%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 355,077 | $ 537,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.30% | 7.50%
Pubs |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.70% | 2.90%
Caravan Park |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio |  | 2.70%
Urban Predevelopment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.60% | 1.90%

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