SCHEDULE I SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES

12 Months Ended

Dec. 31, 2023

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

SCHEDULE I

THE HANOVER INSURANCE GROUP, INC.

SUMMARY OF INVESTMENTS – OTHER THAN INVESTMENTS IN RELATED PARTIES

DECEMBER 31, 2023
(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	$	1,798.2	$	1,626.8	$	1,626.8
States, municipalities and political subdivisions		1,306.0		1,181.9		1,181.9
Foreign governments		2.2		2.2		2.2
Public utilities		350.2		330.3		330.3
All other corporate bonds		5,106.9		4,831.8		4,831.8
Total fixed maturities		8,563.5		7,973.0		7,973.0
Equity securities:
Common stocks:
Public utilities		12.7		25.0		25.0
Banks, trusts and insurance companies		1.6		2.4		2.4
Industrial, miscellaneous and all other		38.9		97.0		97.0
Nonredeemable preferred stock		1.0		6.5		6.5
Total equity securities		54.2		130.9		130.9
Mortgage loans on real estate		381.4		351.8		371.4
Other long-term investments		378.3		425.5		425.5
Short-term investments		12.3		12.3		12.3
Total investments	$	9,389.7	$	8,893.5	$	8,913.1

(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 net of the allowance for credit losses.