v3.25.1
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
Mar. 31, 2025
USD ($)
Guarantor Obligations [Line Items]  
April 1, 2025 - June 30, 2025 $ 6.7
July 1, 2025 - September 30, 2025 6.6
October 1, 2025 - December 31, 2025 6.5
Total 2025 19.8
2026 25.0
2027 23.6
2028 22.0
2029 20.5
2030 and thereafter 184.9
Total gross unearned insurance premiums $ 295.8