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Fair Value of Financial Instruments - Other Assets Measured at Fair Value on a Nonrecurring Basis (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) | Dec. 31, 2023 USD ($) property | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) property
Carrying value and estimated fair value of financial instruments |  |  |  |
Other real estate, fair value |  | $ 84.7 |  | $ 82.9
Number of properties | property |  | 300 |  | 388
Equity method investments |  | $ 19.8 |  |
Lima One |  |  |  |
Carrying value and estimated fair value of financial instruments |  |  |  |
Impairment and other net gain/(loss) on securities and other portfolio investments | $ 38.9 |  | $ 38.9 |
Level 3 | Residential Whole Loans |  |  |  |
Carrying value and estimated fair value of financial instruments |  |  |  |
Loans, fair value |  | 13.6 |  |
Loss from changes in fair value |  | $ 1.2 |  |
Entity Owning a Newly Constructed Industrial Property |  |  |  |
Carrying value and estimated fair value of financial instruments |  |  |  |
Ownership percentage |  | 75.00% |  |
Equity method investments |  | $ 25.7 |  |
Commercial Real Estate Owned |  |  |  |
Carrying value and estimated fair value of financial instruments |  |  |  |
Other real estate, fair value |  | $ 34.2 |  |
Number of properties | property |  | 1 |  |

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