Segment Information - Underwriting Margins and Combined Ratios for our Underwriting Operations (Detail) - Underwriting operations |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Segment Reporting Information [Line Items] | ||||
| Under- writing Margin | 13.80% | 8.10% | 13.90% | 10.90% |
| Combined Ratio | 86.20% | 91.90% | 86.10% | 89.10% |
| Operating Segments | Personal Lines | ||||
| Segment Reporting Information [Line Items] | ||||
| Under- writing Margin | 14.00% | 7.40% | 14.10% | 11.10% |
| Combined Ratio | 86.00% | 92.60% | 85.90% | 88.90% |
| Operating Segments | Commercial Lines | ||||
| Segment Reporting Information [Line Items] | ||||
| Under- writing Margin | 13.20% | 11.40% | 12.90% | 9.80% |
| Combined Ratio | 86.80% | 88.60% | 87.10% | 90.20% |