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INVESTMENTS (Tables)
6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of AFS Debt Securities
The amortized cost and fair value of short-term investments and available-for-sale fixed maturity securities at June 30, 2024 and December 31, 2023 are as follows:

June 30, 2024
Amortized CostAllowance for Expected Credit LossesGross Unrealized GainsGross Unrealized LossesFair Value
(dollars in millions)
Fixed maturities:
U.S. Treasury securities and agencies$28.6 $— $0.1 $(0.3)$28.4 
Municipal securities23.8 — — (0.7)23.1 
Corporate debt securities84.7 — 0.1 (1.5)83.3 
Residential mortgage-backed securities21.0 — 0.1 (0.4)20.7 
Commercial mortgage-backed securities42.1 — — (0.7)41.4 
Other debt obligations27.0 — — (0.1)26.9 
Total fixed maturities227.2 — 0.3 (3.7)223.8 
Short-term investments11.7 — — — 11.7 
Total$238.9 $— $0.3 $(3.7)$235.5 
December 31, 2023
Amortized CostAllowance for Expected Credit LossesGross Unrealized GainsGross Unrealized LossesFair Value
(dollars in millions)
Fixed maturities:
U.S. Treasury securities and agencies$14.6 $— $0.1 $(0.1)$14.6 
Municipal securities24.8 — 0.1 (0.8)24.1 
Corporate debt securities66.3 — 0.2 (1.3)65.2 
Residential mortgage-backed securities12.0 — 0.1 (0.2)11.9 
Commercial mortgage-backed securities30.4 — 0.1 (0.7)29.8 
Other debt obligations20.3 — 0.1 (0.1)20.3 
Total fixed maturities168.4— 0.7(3.2)165.9
Short-term investments0.9— — — 0.9
Total$169.3 $— $0.7 $(3.2)$166.8 
The following table sets forth the amortized cost and fair value of short-term investments and available-for-sale fixed maturity securities by contractual maturity at June 30, 2024:
June 30, 2024
Amortized CostFair Value
(dollars in millions)
Due in one year or less$39.0 $38.6 
Due after one year through five years151.4 149.1 
Due five years through 10 years24.7 24.5 
Due after 10 years23.8 23.3 
Total$238.9 $235.5 
Schedule of Unrealized Losses
The following tables reflect the gross unrealized losses and fair value of short-term investments and available-for-sale fixed maturity securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2024 and December 31, 2023:
June 30, 2024
Less than 12 Months12 Months or MoreTotal
Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
(dollars in millions)
Fixed maturities:
U.S. Treasury securities and agencies$23.0 $(0.2)$2.6 $(0.1)$25.6 $(0.3)
Municipal securities7.8 — 12.5 (0.7)20.3 (0.7)
Corporate debt securities33.1 (0.3)34.3 (1.2)67.4 (1.5)
Residential mortgage-backed securities14.2 (0.1)2.3 (0.3)16.5 (0.4)
Commercial mortgage-backed securities15.8 (0.2)18.1 (0.5)33.9 (0.7)
Other debt obligations15.6 (0.1)3.9 — 19.5 (0.1)
Total fixed maturities109.5 (0.9)73.7 (2.8)183.2 (3.7)
Short-term investments9.4 — — — 9.4 — 
Total$118.9 $(0.9)$73.7 $(2.8)$192.6 $(3.7)
December 31, 2023
Less than 12 Months12 Months or MoreTotal
Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
Fair ValueUnrealized
Loss
(dollars in millions)
Fixed maturities:
U.S. Treasury securities and agencies$1.7 $— $2.4 $(0.1)$4.1 $(0.1)
Municipal securities3.1 — 15.1 (0.8)18.2 (0.8)
Corporate debt securities13.4 — 35.1 (1.3)48.5 (1.3)
Residential mortgage-backed securities4.1 — 1.9 (0.2)6.0 (0.2)
Commercial mortgage-backed securities9.1 (0.1)13.4 (0.6)22.5 (0.7)
Other debt obligations4.4 — 4.4 (0.1)8.8 (0.1)
Total fixed maturities35.8 (0.1)72.3 (3.1)108.1 (3.2)
Short-term investments0.3 — — — 0.3 — 
Total$36.1 $(0.1)$72.3 $(3.1)$108.4 $(3.2)
Schedule of Net Investment Income
The following table sets forth the components of net investment income for the three and six months ended June 30, 2024 and 2023:

Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
(dollars in millions)
Interest on bonds$2.3 $1.0 $4.0 $1.9 
Interest on deposits and cash equivalents8.2 6.0 16.3 11.9 
Total10.5 7.0 20.3 13.8 
Investment expense(0.5)(0.2)(1.1)(0.3)
Net investment income$10.0 $6.8 $19.2 $13.5 
Schedule of Credit Ratings
The following tables summarize the credit ratings of short-term investments and available-for-sale fixed maturity securities at June 30, 2024 and December 31, 2023:

June 30, 2024
Amortized CostFair Value% of Total
Fair Value
(dollars in millions)
S&P Global rating or equivalent
AAA$65.0 $64.1 27.2 %
AA+, AA, AA-, A-1102.0 100.8 42.8 
A+, A, A-55.2 54.0 22.9 
BBB+, BBB, BBB-16.7 16.6 7.1 
Total$238.9 $235.5 100.0 %


December 31, 2023
Amortized CostFair Value % of Total
Fair Value
(dollars in millions)
S&P Global rating or equivalent
AAA$53.0 $52.1 31.2 %
AA+, AA, AA-, A-159.4 58.835.3 
A+, A, A-42.1 41.224.7 
BBB+, BBB, BBB-14.8 14.78.8 
Total$169.3 $166.8 100.0 %