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SCHEDULE VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |
SCHEDULE VI SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS | SCHEDU LE VI THE HANOVER INSURANCE GROUP, INC. SUPPLEMENTAL INFORMATION CONCERNING PROP ERTY AND CASUALTY INSURANCE OPERATIONS
YEARS ENDED DECEMBER 31 |  |  |  |  |  |  |  |  |  |  |  |
(in millions) |  |  |  |  |  |  |  |  |  |  |  |
Affiliation with Registrant |  | Deferred acquisition costs |  |  | Reserves for unpaid claims and claim adjustment expenses (1) |  |  | Discount, if any, deducted from previous column (2) |  |  | Unearned premiums (1) |
Consolidated Property and Casualty Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
2025 |  | $ | 703.0 |  |  | $ | 7,755.2 |  |  | $ | — |  |  | $ | 3,440.4 |
2024 |  | $ | 662.8 |  |  | $ | 7,461.2 |  |  | $ | — |  |  | $ | 3,283.3 |
|  | Earned premiums |  |  | Net investment income |  |  | Claims and claim adjustment expenses incurred related to |  |  | Amortization of deferred acquisition costs |  |  | Paid claims and claim adjustment expenses |  |  | Premiums written |  |
|  |  |  |  |  |  |  | Current year |  |  | Prior years |  |  |  |  |  |  |  |  |  |  |
2025 |  | $ | 6,161.1 |  |  | $ | 454.4 |  |  | $ | 3,825.7 |  |  | $ | (96.4 | ) |  | $ | 1,285.2 |  |  | $ | 3,455.8 |  |  | $ | 6,322.1 |  |
2024 |  | $ | 5,912.6 |  |  | $ | 372.6 |  |  | $ | 3,866.8 |  |  | $ | (109.4 | ) |  | $ | 1,221.7 |  |  | $ | 3,639.1 |  |  | $ | 6,083.6 |  |
2023 |  | $ | 5,663.1 |  |  | $ | 332.1 |  |  | $ | 4,150.5 |  |  | $ | (15.9 | ) |  | $ | 1,176.0 |  |  | $ | 3,885.5 |  |  | $ | 5,810.2 |  |
(1) Reserves for unpaid claims and claim adjustment expenses are shown gross of $1,850.3 million and $1,829.8 million of reinsurance recoverable on unpaid losses in 2025 and 2024, respectively. Unearned premiums are shown gross of prepaid premiums of $98.1 million and $90.5 million in 2025 and 2024, respectively. Reserves for unpaid claims and claim adjustment expenses also include policyholder dividends. (2) The Company does not use discounting techniques.

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- Definition The entire disclosure of supplemental information for registrant, its subsidiary and 50-percent-or-less-owned equity basis investee, with liability for property-casualty insurance claim. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Paragraph Column A -Subparagraph (c) -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column A)(c)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 + Details
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