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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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Pretax underwriting profit loss expressed as a percentage of net premiums earned.

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