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Related Party Transactions (Details) € in Millions, £ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) loan Rate | Mar. 31, 2023 USD ($) loan | Dec. 31, 2023 USD ($) | Mar. 31, 2023 EUR (€) | Mar. 31, 2023 GBP (£) | Feb. 08, 2023 USD ($) loan | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Termination fee, percent fee of base management fee | 3 |  |  |  |  |  |  |
Number of independent directors required | Rate | 66.60% |  |  |  |  |  |  |
Atlas Facility |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan | 5 |  |  |  |  | 1 |  |
Debt interest rate cap | 2 years |  |  |  |  |  |  |
Secured Debt | Credit Suisse Facility | Line of Credit |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  | $ 632.3 |  |
Secured Debt | Atlas Facility | Line of Credit |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, increase (decrease), other, net | $ 115.5 |  |  |  |  |  |  |
Line of Credit | Credit Suisse Facility |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Debt interest rate cap | 2 years |  | 6 months |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of commercial mortgage loans | loan |  | 3 |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | $ 83.5 |  | $ 95.5 |  |  |  |  |
Debt interest rate cap | 2 years 9 months 18 days |  |  |  |  |  |  |
Mixed Use Property - London | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | £ |  |  |  |  | £ 15.0 |  |  |
Various Properties In Europe | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | $ 219.0 |  | € 205.7 |  |  |  |
Mortgage loans on real estate, commercial and consumer, funded, net |  | 122.4 |  | € 115.0 |  |  |  |
Arrangement fees |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Incentive Fee Payable |  |  |  |  |  |  | $ 0.4 | $ 0.2
Limited Liability Company |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Rate of management fees | 1.50% |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |
Period of termination | 180 days |  |  |  |  |  |  |
Termination fee calculation period | 24 months |  |  |  |  |  |  |
Limited Liability Company | Atlas Facility |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |
Limited Liability Company | Management Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payable to related party | $ 9.4 |  | $ 9.6 |  |  |  |  |
Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 30.0
Affiliated Entity | Management Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management fees to related party | 9.4 | 9.5 |  |  |  |  |  |
Professional and Contract Services Expense | $ 1.8 | $ 1.2 |  |  |  |  |  |

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