Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|---|---|
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Known title claims, amount | $ 75.0 | $ 54.6 | ||
| Incurred but not reported claims, amount | 1,053.9 | 1,095.9 | ||
| Non-title claims, amount | 22.7 | 19.1 | ||
| Total loss reserves, amount | $ 1,151.6 | $ 1,169.6 | $ 1,189.3 | $ 1,193.4 |
| Known title claims, percent | 6.50% | 4.70% | ||
| Incurred but not reported claims, percent | 91.50% | 93.70% | ||
| Total title claims, percent | 98.00% | 98.40% | ||
| Non-title claims, percent | 2.00% | 1.60% | ||
| Total loss reserves, percent | 100.00% | 100.00% | ||
| Title Claims | ||||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Total loss reserves, amount | $ 1,128.9 | $ 1,150.5 |