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Segment Information - Underwriting Margins and Combined Ratios for our Underwriting Operations (Detail) - Underwriting operations | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Personal Lines | Agency |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under-writing Margin | 12.70% | (1.40%) | 14.40% | 0.90%
Combined Ratio | 87.30% | 101.40% | 85.60% | 99.10%
Personal Lines | Direct |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under-writing Margin | 10.30% | 2.00% | 12.50% | 0.90%
Combined Ratio | 89.70% | 98.00% | 87.50% | 99.10%
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under-writing Margin | 8.10% | (0.40%) | 10.90% | 0.30%
Combined Ratio | 91.90% | 100.40% | 89.10% | 99.70%
Operating Segments | Personal Lines |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under-writing Margin | 11.40% | 0.50% | 13.40% | 0.90%
Combined Ratio | 88.60% | 99.50% | 86.60% | 99.10%
Operating Segments | Commercial Lines |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under-writing Margin | 11.40% | 3.60% | 9.80% | 2.60%
Combined Ratio | 88.60% | 96.40% | 90.20% | 97.40%
Operating Segments | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Under-writing Margin | (66.30%) | (33.20%) | (30.40%) | (19.60%)
Combined Ratio | 166.30% | 133.20% | 130.40% | 119.60%

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