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SCHEDULE I SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract] |
SCHEDULE I SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES | SCHED ULE I THE HANOVER INSURANCE GROUP, INC. SUMMARY OF INVESTMENTS – OTHER TH AN INVESTMENTS IN RELATED PARTIES
DECEMBER 31, 2025 |  |  |  |  |  |  |  |  |
(in millions) |  |  |  |  |  |  |  |  |
Type of investment |  | Cost (1) |  |  | Fair Value |  |  | Amount at which shown in the balance sheet (2) |
Fixed maturities: |  |  |  |  |  |  |  |  |
Bonds: |  |  |  |  |  |  |  |  |
U.S. Government and government agencies and authorities |  | $ | 2,500.7 |  |  | $ | 2,410.8 |  |  | $ | 2,410.8 |
States, municipalities and political subdivisions |  |  | 910.8 |  |  |  | 847.7 |  |  |  | 847.7 |
Foreign governments |  |  | 2.5 |  |  |  | 2.7 |  |  |  | 2.7 |
Public utilities |  |  | 353.5 |  |  |  | 355.5 |  |  |  | 355.5 |
All other corporate bonds |  |  | 5,916.6 |  |  |  | 5,918.0 |  |  |  | 5,918.0 |
Total fixed maturities |  |  | 9,684.1 |  |  |  | 9,534.7 |  |  |  | 9,534.7 |
Equity securities: |  |  |  |  |  |  |  |  |
Common stocks: |  |  |  |  |  |  |  |  |
Public utilities |  |  | 10.2 |  |  |  | 26.3 |  |  |  | 26.3 |
Banks, trusts and insurance companies |  |  | 1.6 |  |  |  | 3.0 |  |  |  | 3.0 |
Industrial, miscellaneous and all other |  |  | 53.5 |  |  |  | 136.5 |  |  |  | 136.5 |
Nonredeemable preferred stock |  |  | 12.4 |  |  |  | 19.0 |  |  |  | 19.0 |
Total equity securities |  |  | 77.7 |  |  |  | 184.8 |  |  |  | 184.8 |
Mortgage loans on real estate |  |  | 255.1 |  |  |  | 238.7 |  |  |  | 247.0 |
Other long-term investments |  |  | 386.1 |  |  |  | 414.4 |  |  |  | 414.4 |
Short-term investments |  |  | 1.8 |  |  |  | 1.8 |  |  |  | 1.8 |
Total investments |  | $ | 10,404.8 |  |  | $ | 10,374.4 |  |  | $ | 10,382.7 |
(1) Original cost of equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums and accretion of discounts. (2) Mortgage loans on real estate are shown on the balance sheet at unpaid principal balances adjusted for deferred fees or expenses, net of an allowance for credit losses.

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- Definition The entire disclosure of information about investment held by insurance company, excluding investment in related party. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 15 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-7 + Details
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