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Segment Information (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Financial Information with Respect to Reporting Segments

Summarized below is financial information with respect to the Company’s reporting segments.

December 31, 2025
(in millions)			Core Commercial				Specialty				Personal Lines				Other				Total
Operating revenues:
Premiums		$		2,211.0		$		1,398.3		$		2,551.8		$		—		$		6,161.1
Net investment income				202.5				102.6				128.5				20.8				454.4
Fees and other income				5.2				4.8				14.7				0.2				24.9
Total operating revenues		$		2,418.7		$		1,505.7		$		2,695.0		$		21.0		$		6,640.4
Net realized and unrealized investment losses																				(46.0	)
Total revenues																		$		6,594.4
Operating income before interest expense    and income taxes:
Net premiums earned		$		2,211.0		$		1,398.3		$		2,551.8		$		—		$		6,161.1
Losses and LAE:
Current accident year losses and LAE				1,305.6				699.6				1,518.2				—				3,523.4
Prior year unfavorable (favorable) development,    excluding catastrophes				(7.1	)			(56.8	)			(7.2	)			0.7				(70.4	)
Catastrophe losses				124.4				38.1				139.8				—				302.3
Prior year favorable catastrophe    development				(11.0	)			(4.0	)			(11.0	)			—				(26.0	)
Total losses and LAE				1,411.9				676.9				1,639.8				0.7				3,729.3
Amortization of deferred acquisition costs and other    underwriting expenses(1)				746.9				524.1				668.3				—				1,939.3
Underwriting income (loss)				52.2				197.3				243.7				(0.7	)			492.5
Net investment income				202.5				102.6				128.5				20.8				454.4
Fees and other income				5.2				4.8				14.7				0.2				24.9
Other segment items(2)				(9.0	)			(8.6	)			(7.1	)			(14.1	)			(38.8	)
Operating income before interest expense    and income taxes		$		250.9		$		296.1		$		379.8		$		6.2		$		933.0
Interest on debt																				(43.2	)
Operating income before income taxes																				889.8
Non-operating income items:
Net realized and unrealized investment losses																				(46.0	)
Income from continuing operations before income taxes																		$		843.8

(1)Includes expenses directly incurred by each reporting segment, as well as corporate and other general expenses that are allocated using a consistent and reasonable approach, generally based on net premiums earned.

(2)Other segment items in Core Commercial, Specialty and Personal Lines primarily includes uncollectible premium charge-offs and non-insurance agency operating expenses, whereas other segment items in the Other segment includes operating costs related to certain of THG’s former life insurance businesses, including defined benefit pension-related costs, as well as holding company expenses.

December 31, 2024
(in millions)			Core Commercial				Specialty				Personal Lines				Other				Total
Operating revenues:
Premiums		$		2,148.8		$		1,322.0		$		2,441.8		$		—		$		5,912.6
Net investment income				170.4				84.5				106.7				11.0				372.6
Fees and other income				5.0				5.9				15.7				1.4				28.0
Total operating revenues		$		2,324.2		$		1,412.4		$		2,564.2		$		12.4		$		6,313.2
Net realized and unrealized investment losses																				(75.8	)
Total revenues																		$		6,237.4
Operating income (loss) before interest expense and    income taxes:
Net premiums earned		$		2,148.8		$		1,322.0		$		2,441.8		$		—		$		5,912.6
Losses and LAE:
Current accident year losses and LAE				1,242.6				655.4				1,550.9				—				3,448.9
Prior year unfavorable (favorable) development,    excluding catastrophes				(17.7	)			(46.2	)			(4.9	)			1.4				(67.4	)
Catastrophe losses				109.5				52.2				256.2				—				417.9
Prior year unfavorable (favorable) catastrophe    development				(32.3	)			(14.7	)			5.0				—				(42.0	)
Total losses and LAE				1,302.1				646.7				1,807.2				1.4				3,757.4
Amortization of deferred acquisition costs and other    underwriting expenses(1)				731.9				500.1				638.7				—				1,870.7
Underwriting income (loss)				114.8				175.2				(4.1	)			(1.4	)			284.5
Net investment income				170.4				84.5				106.7				11.0				372.6
Fees and other income				5.0				5.9				15.7				1.4				28.0
Other segment items(2)				(8.6	)			(7.9	)			(7.0	)			(11.5	)			(35.0	)
Operating income (loss) before interest expense    and income taxes		$		281.6		$		257.7		$		111.3		$		(0.5	)	$		650.1
Interest on debt																				(34.1	)
Operating income before income taxes																				616.0
Non-operating income (loss) items:
Net realized and unrealized investment losses																				(75.8	)
Other non-operating items																				(2.4	)
Income from continuing operations before income taxes																		$		537.8

(1)Includes expenses directly incurred by each reporting segment, as well as corporate and other general expenses that are allocated using a consistent and reasonable approach, generally based on net premiums earned.

(2)Other segment items in Core Commercial, Specialty and Personal Lines primarily includes uncollectible premium charge-offs and non-insurance agency operating expenses, whereas other segment items in the Other segment includes operating costs related to certain of THG’s former investment and life insurance businesses, including defined benefit pension-related costs, as well as holding company expenses.

December 31, 2023
(in millions)			Core Commercial				Specialty				Personal Lines				Other				Total
Operating revenues:
Premiums		$		2,060.3		$		1,274.2		$		2,328.6		$		—		$		5,663.1
Net investment income				151.8				71.1				96.8				12.4				332.1
Fees and other income				4.7				6.4				16.7				3.0				30.8
Total operating revenues		$		2,216.8		$		1,351.7		$		2,442.1		$		15.4		$		6,026.0
Net realized and unrealized investment losses																				(32.5	)
Total revenues																		$		5,993.5
Operating income (loss) before interest expense    and income taxes:
Net premiums earned		$		2,060.3		$		1,274.2		$		2,328.6		$		—		$		5,663.1
Losses and LAE:
Current accident year losses and LAE				1,178.9				651.2				1,630.3				—				3,460.4
Prior year unfavorable (favorable) development,    excluding catastrophes				4.7				(48.8	)			25.9				2.3				(15.9	)
Catastrophe losses				178.0				51.4				460.7				—				690.1
Prior year unfavorable (favorable) catastrophe    development				(6.7	)			(8.3	)			15.0				—				—
Total losses and LAE				1,354.9				645.5				2,131.9				2.3				4,134.6
Amortization of deferred acquisition costs and other    underwriting expenses(1)				688.8				455.8				608.3				—				1,752.9
Underwriting income (loss)				16.6				172.9				(411.6	)			(2.3	)			(224.4	)
Net investment income				151.8				71.1				96.8				12.4				332.1
Fees and other income				4.7				6.4				16.7				3.0				30.8
Other segment items(2)				(5.9	)			(6.9	)			(6.2	)			(13.9	)			(32.9	)
Operating income (loss) before interest expense    and income taxes		$		167.2		$		243.5		$		(304.3	)	$		(0.8	)	$		105.6
Interest on debt																				(34.1	)
Operating income before income taxes																				71.5
Non-operating income (loss) items:
Net realized and unrealized investment losses																				(32.5	)
Other non-operating items																				2.1
Income from continuing operations before income taxes																		$		41.1

(1)Includes expenses directly incurred by each reporting segment, as well as corporate and other general expenses that are allocated using a consistent and reasonable approach, generally based on net premiums earned.

(2)Other segment items in Core Commercial, Specialty and Personal Lines primarily includes uncollectible premium charge-offs and non-insurance agency operating expenses, whereas other segment items in the Other segment includes operating costs related to certain of THG’s former investment and life insurance businesses, including defined benefit pension-related costs, as well as holding company expenses.

Identifiable Assets by Business Segment

The following table provides identifiable assets for the Company’s business segments and discontinued operations:

DECEMBER 31		2025				2024
(in millions)		Identifiable Assets
Property and Casualty		$	16,862.3			$	15,188.8
Assets of discontinued businesses			83.6				85.7
Total		$	16,945.9			$	15,274.5

X

- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets.

+ 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
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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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