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Segment Information (Tables)

9 Months Ended

Sep. 30, 2024

Segment Reporting [Abstract]

Reconciliation of operating results by reportable segment

The following tables present the Company's operating results by reportable segment:

			Three Months Ended September 30,
			2024																		2023
			Property & Casualty						Other						Total						Property & Casualty						Other						Total
			(Amounts in millions)
Net premiums earned			$	1,313.3					$	7.4					$	1,320.7					$	1,083.0					$	7.3					$	1,090.3
Less:
Losses and loss adjustment expenses			914.0						4.4						918.4						819.7						4.0						823.7
Underwriting expenses			312.2						4.9						317.1						247.1						3.7						250.8
Underwriting gain (loss)			87.1						(1.9)						85.2						16.2						(0.4)						15.8
Investment income															72.7																		61.0
Net realized investment gains (losses)															114.4																		(90.0)
Other income															22.5																		3.9
Interest expense															(7.7)																		(5.9)
Pre-tax income (loss)															$	287.1																	$	(15.2)
Net income (loss)															$	230.9																	$	(8.2)

			Nine Months Ended September 30,
			2024																		2023
			Property & Casualty						Other						Total						Property & Casualty						Other						Total
			(Amounts in millions)
Net premiums earned			$	3,701.3					$	22.1					$	3,723.4					$	3,107.8					$	21.7					$	3,129.5
Less:
Losses and loss adjustment expenses			2,746.4						12.7						2,759.1						2,639.4						11.7						2,651.1
Underwriting expenses			863.5						12.1						875.6						715.1						10.9						726.0
Underwriting gain (loss)			91.4						(2.7)						88.7						(246.7)						(0.9)						(247.6)
Investment income															206.7																		171.3
Net realized investment gains (losses)															155.5																		(60.8)
Other income															23.8																		15.0
Interest expense															(23.3)																		(16.4)
Pre-tax income (loss)															$	451.4																	$	(138.5)
Net income (loss)															$	366.9																	$	(95.1)

Schedule direct premiums attributable to segment

The following tables present the Company’s net premiums earned and direct premiums written by reportable segment and line of insurance business:

			Three Months Ended September 30,
			2024																		2023
			Property & Casualty						Other						Total						Property & Casualty						Other						Total
			(Amounts in millions)
Private passenger automobile			$	854.4					$	—					$	854.4					$	713.2					$	—					$	713.2
Homeowners			301.8						—						301.8						244.0						—						244.0
Commercial automobile			97.3						—						97.3						78.4						—						78.4
Other			59.8						7.4						67.2						47.4						7.3						54.7
Net premiums earned			$	1,313.3					$	7.4					$	1,320.7					$	1,083.0					$	7.3					$	1,090.3
Private passenger automobile			$	878.2					$	—					$	878.2					$	772.8					$	—					$	772.8
Homeowners			370.2						—						370.2						307.7						—						307.7
Commercial automobile			95.8						—						95.8						93.7						—						93.7
Other			114.7						6.8						121.5						55.8						7.2						63.0
Direct premiums written			$	1,458.9					$	6.8					$	1,465.7					$	1,230.0					$	7.2					$	1,237.2

			Nine Months Ended September 30,
			2024																		2023
			Property & Casualty						Other						Total						Property & Casualty						Other						Total
			(Amounts in millions)
Private passenger automobile			$	2,408.3											$	2,408.3					$	2,048.5					$	—					$	2,048.5
Homeowners			852.3												852.3						700.4						—						700.4
Commercial automobile			280.7												280.7						219.6						—						219.6
Other			160.0						22.1						182.1						139.3						21.7						161.0
Net premiums earned			$	3,701.3					$	22.1					$	3,723.4					$	3,107.8					$	21.7					$	3,129.5
Private passenger automobile			$	2,551.3											$	2,551.3					$	2,105.6					$	—					$	2,105.6
Homeowners			1,034.2												1,034.2						843.8						—						843.8
Commercial automobile			298.6												298.6						256.4						—						256.4
Other			249.8						20.2						270.0						168.7						20.7						189.4
Direct premiums written			$	4,133.9					$	20.2					$	4,154.1					$	3,374.5					$	20.7					$	3,395.2

X

- Definition

Disclosure of direct premium written by line of business.

+ References

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- Definition

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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