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SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS | SCHEDU LE V THE HANOVER INSURANCE GROUP, INC. VALUATION AND QUA LIFYING ACCOUNTS
DECEMBER 31 |  |  |  |  |  |  |  |  |  |  |  |
(in millions) Description |  | Balance at beginning of period |  |  | Additions (Charged to costs and expenses) |  |  | Deductions |  |  | Balance at end of period |
2025 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 6.4 |  |  | $ | 15.9 |  |  | $ | (15.5 | ) |  | $ | 6.8 |
Allowance for uncollectible reinsurance recoverables |  |  | 6.5 |  |  |  | 0.6 |  |  |  | (0.3 | ) |  |  | 6.8 |
|  | $ | 12.9 |  |  | $ | 16.5 |  |  | $ | (15.8 | ) |  | $ | 13.6 |
2024 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 5.1 |  |  | $ | 15.9 |  |  | $ | (14.6 | ) |  | $ | 6.4 |
Allowance for uncollectible reinsurance recoverables |  |  | 6.9 |  |  |  | — |  |  |  | (0.4 | ) |  |  | 6.5 |
|  | $ | 12.0 |  |  | $ | 15.9 |  |  | $ | (15.0 | ) |  | $ | 12.9 |
2023 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 6.2 |  |  | $ | 13.1 |  |  | $ | (14.2 | ) |  | $ | 5.1 |
Allowance for uncollectible reinsurance recoverables |  |  | 7.9 |  |  |  | — |  |  |  | (1.0 | ) |  |  | 6.9 |
|  | $ | 14.1 |  |  | $ | 13.1 |  |  | $ | (15.2 | ) |  | $ | 12.0 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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- References No definition available. + Details
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