Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Number of Consolidated CIVs by Type (Details) - Variable Interest Entity, Primary Beneficiary - Consolidated Investment Vehicles	Jun. 30, 2022 consolidatedInvestmentVehicle	Jun. 30, 2022 consolidatedInvestmentFund	Jun. 30, 2022 consolidatedCLO	Jun. 30, 2022 cLOWarehouse	Jun. 30, 2022 Entity	Dec. 31, 2021 consolidatedInvestmentVehicle	Dec. 31, 2021 consolidatedInvestmentFund	Dec. 31, 2021 consolidatedCLO	Dec. 31, 2021 cLOWarehouse	Dec. 31, 2021 Entity	Jun. 30, 2021 Entity	Dec. 31, 2020 Entity
Variable Interest Entity [Line Items]
Total number of entities consolidated	21				21	20				20	15	11
Investment Managed Funds
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedInvestmentFund		9					8
Collateralized Loan Obligations
Variable Interest Entity [Line Items]
Total number of entities consolidated | consolidatedCLO			10					9
Collateralized Loan Obligation Warehouses
Variable Interest Entity [Line Items]
Total number of entities consolidated | cLOWarehouse				2					3