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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 29, 2021 USD ($) | Oct. 28, 2021 USD ($)
Sponsored REITs |  |  |  |  |
Amount Drawn |  |  |  | $ 24.0 | $ 21.0
Related party mortgage loan receivable |  |  |  | 24.0 | $ 21.0
Number of additional commitments to lend | item | 0 |  |  |  |
Sponsored REITs |  |  |  |  |
Sponsored REITs |  |  |  |  |
Interest income and fees from the Sponsored REIT Loans | $ 0.0 | $ 1.8 | $ 1.6 |  |
FSP Monument Circle LLC |  |  |  |  |
Sponsored REITs |  |  |  |  |
Additional loan amount |  |  |  | $ 3.0 |

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