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Agreements and Transactions with Related Parties - 2015 Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2015
Agreements and Transactions with Related Parties |  |  |  |  |  |
Indirect ownership percentage |  |  | 12.30% |  | 12.30% |
Residential mortgage banking business | Other Related Party Transactions | Related Party | Noncontrolling Interest |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |
Indirect ownership percentage |  |  | 12.30% |  |  |
Loss on investment | $ 0.8 | $ (3.5) | $ (0.8) | $ (2.6) |  |
Distribution received | $ 7.7 | $ 7.5 | $ 7.7 | $ 7.5 |  |
Residential mortgage banking business | Other Related Party Transactions | Related Party | ACM |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |
Noncontrolling interest in equity method investment acquired (as a percent) |  |  |  |  |  | 50.00%
ACM | Residential mortgage banking business | Other Related Party Transactions | Related Party |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |
Acquisition purchase price |  |  |  |  |  | $ 9.6

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