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v3.23.3

Segment Information - Underwriting Margins and Combined Ratios for our Underwriting Operations (Detail) - Underwriting operations | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Personal Lines | Agency |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin | 6.20% | (0.90%) | 2.80% | 3.90%
Combined Ratio | 93.80% | 100.90% | 97.20% | 96.10%
Personal Lines | Direct |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin | 11.10% | 0.80% | 4.40% | 2.60%
Combined Ratio | 88.90% | 99.20% | 95.60% | 97.40%
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin | 7.60% | 0.80% | 2.80% | 3.50%
Combined Ratio | 92.40% | 99.20% | 97.20% | 96.50%
Operating Segments | Personal Lines |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin | 8.80% | 0.00% | 3.70% | 3.20%
Combined Ratio | 91.20% | 100.00% | 96.30% | 96.80%
Operating Segments | Commercial Lines |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin | 0.90% | 10.30% | 2.00% | 10.10%
Combined Ratio | 99.10% | 89.70% | 98.00% | 89.90%
Operating Segments | Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin | 11.80% | (25.10%) | (8.90%) | (17.10%)
Combined Ratio | 88.20% | 125.10% | 108.90% | 117.10%
Combined ratio amortization points | 0.005 | 0.009 | 0.006 | 0.014

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