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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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