Municipal Bond Guarantee Insurance - Schedule of Municipal Bond Guarantee Insured Obligations (Details) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2025
USD ($)
contract
|
Dec. 31, 2024
USD ($)
contract
|
|
| Subsidiary - HG Global | Maximum | ||
| Guarantor Obligations [Line Items] | ||
| Percentage of par value of policy reinsured | 15.00% | |
| HG Global | ||
| Guarantor Obligations [Line Items] | ||
| Contracts outstanding | contract | 16,449 | 15,884 |
| Remaining weighted average contract period (in years) | 11 years 4 months 24 days | 11 years 2 months 12 days |
| Outstanding first loss exposure from policies assumed (in millions) | $ 19,391.0 | $ 18,503.3 |
| Total gross unearned insurance premiums | $ 307.9 | $ 297.3 |