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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, 2025
USD ($)
Guarantor Obligations [Line Items]  
October 1, 2025 - December 31, 2025 $ 7.1
2026 26.8
2027 25.4
2028 23.8
2029 22.3
2030 and thereafter 210.9
Total gross unearned insurance premiums $ 316.3