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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Roll Forward of Number of Consolidated CIVs (Details) - Consolidated Investment Vehicles
 3 Months Ended
Mar. 31, 2022
Entity
fund
Mar. 31, 2021
Entity
fund
Dec. 31, 2021
Entity
Dec. 31, 2020
Entity
CLO Warehouse        
Variable Interest Entity [Line Items]        
Number of financial assets securitized | fund 0 1    
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Beginning of year 20 12 20 11
Consolidated 0 2    
Deconsolidated 0 (1)    
End of year 20 12