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Municipal Bond Guarantee Insurance - Schedule of Municipal Guarantee Insurance Contracts, Premium Received Over Contract Period (Details) - Variable Interest Entity, Primary Beneficiary - Build America Mutual Assurance Company
$ in Millions
Jun. 30, 2024
USD ($)
Guarantor Obligations [Line Items]  
July 1, 2024 - December 31, 2024 $ 15.2
January 1, 2025 - March 31, 2025 7.4
April 1, 2025 - June 30, 2025 7.3
July 1, 2025 - September 30, 2025 7.2
October 1, 2025 - December 31, 2025 7.1
Total 2025 29.0
2026 27.3
2027 25.7
2028 23.8
2029 22.0
2030 and thereafter 190.2
Total gross unearned insurance premiums $ 333.2