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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 — Summary of Investments
Other-Than-Investments in Related Parties
 Cost or
Amortized
Cost
Fair
Value
Amount at
which shown in
balance sheet
 (in millions)
Fixed maturity securities:
U.S. government and government agencies and authorities$1.9 $1.8 $1.8 
States, municipalities and political subdivisions0.5 0.5 0.5 
Foreign governments0.2 0.2 0.2 
Asset backed securities0.1 0.1 0.1 
Residential mortgage-backed4.8 4.1 4.1 
U.S. corporate2.1 2.2 2.2 
Foreign corporate0.4 0.4 0.4 
Total fixed maturity securities10.0 9.3 9.3 
Short-term investments1.6 1.6 1.6 
Total investments$11.6 $10.9 $10.9