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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Number of Consolidated CIVs by Type (Details) (Details) - Consolidated Investment Vehicles | Dec. 31, 2023 consolidatedInvestmentFund | Dec. 31, 2023 consolidatedCLO | Dec. 31, 2023 cLOWarehouse | Dec. 31, 2023 consolidatedInvestmentVehicle | Dec. 31, 2023 Entity | Dec. 31, 2022 consolidatedInvestmentFund | Dec. 31, 2022 consolidatedCLO | Dec. 31, 2022 cLOWarehouse | Dec. 31, 2022 consolidatedInvestmentVehicle | Dec. 31, 2022 Entity | Dec. 31, 2021 Entity
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Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated |  |  |  | 3 | 3 |  |  |  | 22 | 22 | 20
Variable Interest Entity, Primary Beneficiary | Funds |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | consolidatedInvestmentFund | 3 |  |  |  |  | 8 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | CLO contracts |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | consolidatedCLO |  | 0 |  |  |  |  | 10 |  |  |  |
Variable Interest Entity, Primary Beneficiary | CLO warehouses |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | cLOWarehouse |  |  | 0 |  |  |  |  | 4 |  |  |
Voting Interest Entity |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of entities consolidated | consolidatedInvestmentVehicle |  |  |  |  |  |  |  |  | 2 |  |

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