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Secured Borrowings - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
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Oct. 31, 2025 | Nov. 30, 2025 | Oct. 31, 2025 | Sep. 30, 2025 | Jul. 31, 2025 | Mar. 31, 2025 | Jan. 31, 2025 | May 24, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | May 31, 2025 | Apr. 30, 2025
Morgan Stanley Bank, N.A. |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Amount at risk |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |
Weighted average extended maturities |  |  |  |  |  |  |  |  | 4 years 4 months 24 days |  |  |  |
Repurchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of repurchase agreements for which margin calls are limited to collateral specific credit marks |  |  |  |  |  |  |  |  | 66.00% |  |  |  |
Percentage of repurchase agreements containing margin call provisions for general capital market activity |  |  |  |  |  |  |  |  | 34.00% |  |  |  |
Percentage of repurchase agreements containing margin call provisions that pertain to loans held-for-sale |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  | $ 36,400 | $ 36,500 | $ 40,700 |  |
Long term debt, gross |  |  |  |  |  |  |  |  | 12,780,793 | 11,236,129 |  |  |
Several Commercial Credit Facilities | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |
Several Commercial Credit Facilities | Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in weighted average maturity |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |  |  |
Several Commercial Credit Facilities | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in weighted average maturity |  |  |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |  |
Infrastructure Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  |  | $ 125,000 |  |  |  |  |  |  |
Decrease in basis spread |  |  |  |  |  | 0.20% |  |  |  |  |  |  |
STWD 2025-FL4 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Face Amount |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes purchased by third-party investors |  | 968,600 |  |  |  |  |  |  |  |  |  |  |
Long term debt, gross |  | $ 135,200 |  |  |  |  |  |  |  |  |  |  |
CLO contribution period |  | 2 years 6 months |  |  |  |  |  |  |  |  |  |  |
STWD 2019-FL1 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from convertible debt |  |  |  |  |  |  |  |  |  |  |  | $ 220,100 |
Starwood 2025-SIF6 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Face Amount | $ 500,000 |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Principal amount of notes purchased by third-party investors | 413,500 |  | 413,500 |  |  |  |  |  |  |  |  |  |
Long term debt, gross | $ 86,500 |  | 86,500 |  |  |  |  |  |  |  |  |  |
CLO contribution period | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Starwood 2025-SIF5 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Principal amount of notes purchased by third-party investors |  |  |  |  |  |  |  |  |  |  |  |  | 413,500
Long term debt, gross |  |  |  |  |  |  |  |  |  |  |  |  | $ 86,500
CLO contribution period |  |  |  |  |  |  |  | 3 years |  |  |  |  |
STWD 2021-SIF2 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 410,000 |  |  |  |  |
ABS, FI Series 2025-1 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Face Amount | $ 492,100 |  | 492,100 |  |  |  |  |  |  |  |  |  |
Principal amount of notes purchased by third-party investors | $ 391,100 |  | $ 391,100 |  |  |  |  |  |  |  |  |  |
Debt, weighted average interest rate | 5.26% |  | 5.26% |  |  |  |  |  |  |  |  |  |
ABS, FI Series 2025-1 | Weighted-average |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period |  |  | 6 years 5 months 12 days |  |  |  |  |  |  |  |  |  |
CLOs |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  | $ 4,200 | 7,300 | $ 8,700 |  |
Deferred financing costs, net of amortization |  |  |  |  |  |  |  |  | 21,600 | $ 7,900 |  |  |
Secured Borrowings | 2032 Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |
Maturity period |  |  |  | 7 years |  |  |  |  |  |  |  |  |
Basis spread |  |  |  | 2.25% |  |  |  |  |  |  |  |  |
Debt Instrument, issue discount percentage |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Secured Borrowings | 2027 Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Face Amount |  |  |  |  | $ 682,600 |  |  |  |  |  |  |  |
Decrease in basis spread |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
Secured Borrowings | 2030 Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Face Amount |  |  |  |  | $ 893,300 |  | $ 900,000 |  |  |  |  |  |
Decrease in basis spread |  |  |  |  | 0.25% |  | 0.73% |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |
Fundamental Income Properties, LLC | Revolving credit facility | Fundamental Revolving Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |
Basis spread |  |  |  |  |  |  |  |  | 2.50% |  |  |  |
Long term line of credit outstanding |  |  |  |  |  |  |  |  | $ 115,300 |  |  |  |
Basis spread floor |  |  |  |  |  |  |  |  | 0.50% |  |  |  |

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