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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 - HG Global
$ in Millions
Sep. 30, 2024
USD ($)
Guarantor Obligations [Line Items]  
October 1, 2024 - December 31, 2024 $ 6.6
January 1, 2025 - March 31, 2025 6.4
April 1, 2025 - June 30, 2025 6.4
July 1, 2025 - September 30, 2025 6.2
October 1, 2025 - December 31, 2025 6.1
Total 2025 25.1
2026 23.7
2027 22.3
2028 20.8
2029 19.3
2030 and thereafter 169.2
Total gross unearned insurance premiums $ 287.0