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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, 2020
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, 2020
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$559.0 $709.8 $709.8 
      States, Municipalities, and Political Subdivisions3,609.9 4,261.2 4,261.2 
      Foreign Governments902.9 1,168.2 1,168.2 
      Public Utilities5,486.4 6,962.3 6,962.3 
      Mortgage/Asset-Backed Securities1,019.9 1,107.7 1,107.7 
      All Other Corporate Bonds24,958.8 29,918.6 29,918.6 
   Redeemable Preferred Stocks9.6 9.5 9.5 
              Total Fixed Maturity Securities36,546.5 44,137.3 44,137.3 
Mortgage Loans2,445.2 2,432.1 
Policy Loans3,683.9 3,683.9 
Other Long-term Investments
      Derivatives— 19.8 (2)
      Perpetual Preferred Equity Securities32.6 28.3 (3)
Private Equity Partnerships720.9 747.5 (3)
      Miscellaneous Long-term Investments165.2 164.6 
Short-term Investments1,470.0 1,470.0 
Total Investments$45,064.3 $52,683.5 

(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 expected credit losses.

(2)Derivatives are carried at fair value.

(3)The difference between amortized cost and carrying value for private equity partnerships and perpetual preferred equity securities primarily results from changes in the partnership owner's equity and the issuer's equity since acquisition, respectively.