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Schedule I - Summary of Investments, Other Than Investments in Related Parties 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] |
Summary of Investments, Other Than Investments in Related Parties | SCHEDULE I--SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES as of December 31, 2025 Unum Group and Subsidiaries
Type of Investment |  | Cost or Amortized Cost (1) |  | Fair Value |  | Amount shown on the balance sheet
|  | (in millions of dollars)
Fixed Maturity Securities: |  |  |  |  |  |
Bonds |  |  |  |  |  |
United States Government and Government Agencies and Authorities |  | $ | 543.8 |  |  | $ | 545.0 |  |  | $ | 545.0 |
States, Municipalities, and Political Subdivisions |  | 3,450.7 |  |  | 3,058.1 |  |  | 3,058.1 |
Foreign Governments |  | 1,008.8 |  |  | 870.3 |  |  | 870.3 |
Public Utilities |  | 5,048.6 |  |  | 4,933.9 |  |  | 4,933.9 |
Mortgage/Asset-Backed Securities(2) |  | 1,187.3 |  |  | 1,179.3 |  |  | 1,179.3 |
All Other Corporate Bonds |  | 23,500.0 |  |  | 22,462.1 |  |  | 22,462.1 |
Redeemable Preferred Stocks |  | 8.0 |  |  | 7.9 |  |  | 7.9 |
Total Fixed Maturity Securities |  | $ | 34,747.2 |  |  | $ | 33,056.6 |  |  | $ | 33,056.6 |
Mortgage Loans |  | 2,125.4 |  |  |  |  | 2,109.5 |
Policy Loans |  | 3,668.1 |  |  |  |  | 3,668.1 |
Other Long-term Investments |  |  |  |  |  |
Derivatives(3) |  | — |  |  |  |  | 69.7 |
Perpetual Preferred and Equity Securities(4) |  | 15.2 |  |  |  |  | 20.0 |
Private Equity Partnerships(4) |  | 1,185.8 |  |  |  |  | 1,456.3 |
Miscellaneous Long-term Investments |  | 124.4 |  |  |  |  | 124.4 |
Short-term Investments |  | 3,016.2 |  |  |  |  | 3,016.2 |
Total Investments |  | $ | 44,882.3 |  |  |  |  | $ | 43,520.8 |
(1)The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from declines in fair value, amortization of premiums, and/or accretion of discounts. The amortized cost for these investments does not include allowance for credit losses. (2)Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types. (3)Derivatives are carried at fair value. (4)The difference between amortized cost and carrying value for private equity partnerships and perpetual preferred and equity securities primarily results from changes in the partnership owner's equity and the security's market valuation since acquisition, respectively.

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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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