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Municipal Bond Guarantee - Schedule of Municipal Guarantee Insurance Contracts, Premium Received Over Contract Period (Details) - Variable Interest Entity, Primary Beneficiary - Build America Mutual Assurance Company
$ in Millions
Dec. 31, 2023
USD ($)
Guarantor Obligations [Line Items]  
January 1, 2024 - March 31, 2024 $ 7.5
April 1, 2024 - June 30, 2024 7.5
July 1, 2024 - September 30, 2024 7.3
October 1, 2024 - December 31, 2024 7.2
Total 29.5
2025 27.7
2026 26.0
2027 24.4
2028 22.6
2029 and thereafter 195.6
Total gross unearned insurance premiums $ 325.8