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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
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 ValueAmount 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 Subdivisions3,450.7 3,058.1 3,058.1 
      Foreign Governments1,008.8 870.3 870.3 
      Public Utilities5,048.6 4,933.9 4,933.9 
      Mortgage/Asset-Backed Securities(2)
1,187.3 1,179.3 1,179.3 
      All Other Corporate Bonds23,500.0 22,462.1 22,462.1 
   Redeemable Preferred Stocks8.0 7.9 7.9 
              Total Fixed Maturity Securities$34,747.2 $33,056.6 $33,056.6 
Mortgage Loans2,125.4 2,109.5 
Policy Loans3,668.1 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 Investments124.4 124.4 
Short-term Investments3,016.2 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.