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Segment Information (Tables) | 12 Months Ended
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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 |

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