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Segment Information (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Reconciliation of operating results by reportable segment

The following table presents operating results by reportable segment for the years ended:

			Year Ended December 31,
			2024																		2023																		2022
			Property & Casualty						Other						Total						Property & Casualty						Other						Total						Property & Casualty						Other						Total
			(Amounts in millions)
Net premiums earned			$	5,046.1					$	29.4					$	5,075.5					$	4,245.4					$	29.0					$	4,274.4					$	3,923.6					$	28.9					$	3,952.5
Less:
Losses			3,156.4						14.9						3,171.3						3,019.4						13.7						3,033.1						2,851.3						13.1						2,864.4
Loss adjustment expenses			511.3						1.9						513.2						482.8						2.0						484.8						495.9						1.9						497.8
Losses and loss adjustment expenses			3,667.7						16.8						3,684.5						3,502.2						15.7						3,517.9						3,347.2						15.0						3,362.2
Policy acquisition costs			846.6						11.7						858.3						696.9						11.6						708.5						645.5						9.1						654.6
Other operating expenses			324.1						3.1						327.2						276.6						3.1						279.7						276.5						3.2						279.7
Underwriting gain (loss)			207.7						(2.2)						205.5						(230.3)						(1.4)						(231.7)						(345.6)						1.6						(344.0)
Investment income															280.0																		234.6																		168.4
Net realized investment gains (losses)															88.7																		101.0																		(488.1)
Other income															31.5																		19.7																		10.2
Interest expense															(30.8)																		(24.2)																		(17.2)
Pre-tax income (loss)															$	574.9																	$	99.4																	$	(670.7)
Net income (loss)															$	468.0																	$	96.3																	$	(512.7)

Schedule direct premiums attributable to segment

The following table presents the Company’s net premiums earned and direct premiums written by line of insurance business for the years ended:

			Year Ended December 31,
			2024																		2023																		2022
			Property & Casualty						Other						Total						Property & Casualty						Other						Total						Property & Casualty						Other						Total
			(Amounts in millions)
Private passenger automobile			$	3,278.5					$	—					$	3,278.5					$	2,796.1					$	—					$	2,796.1					$	2,655.7					$	—					$	2,655.7
Homeowners			1,168.7						—						1,168.7						957.7						—						957.7						830.6						—						830.6
Commercial automobile			378.2						—						378.2						303.9						—						303.9						267.9						—						267.9
Other			220.7						29.4						250.1						187.7						29.0						216.7						169.4						28.9						198.3
Net premiums earned			$	5,046.1					$	29.4					$	5,075.5					$	4,245.4					$	29.0					$	4,274.4					$	3,923.6					$	28.9					$	3,952.5
Private passenger automobile			$	3,395.8					$	—					$	3,395.8					$	2,841.8					$	—					$	2,841.8					$	2,598.9					$	—					$	2,598.9
Homeowners			1,367.3						—						1,367.3						1,119.0						—						1,119.0						940.3						—						940.3
Commercial automobile			387.0						—						387.0						346.2						—						346.2						276.8						—						276.8
Other			324.2						26.5						350.7						224.9						26.6						251.5						202.1						30.4						232.5
Direct premiums written			$	5,474.3					$	26.5					$	5,500.8					$	4,531.9					$	26.6					$	4,558.5					$	4,018.1					$	30.4					$	4,048.5

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- Definition

Disclosure of direct premium written by line of business.

+ References

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Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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