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Schedule I-Summary of Investments Other-Than-Investments in Related Parties
12 Months Ended
Dec. 31, 2021
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$0.9 $0.9 $0.9 
States, municipalities and political subdivisions0.5 0.5 0.5 
Foreign governments0.5 0.6 0.6 
Residential mortgage-backed4.4 4.4 4.4 
Commercial mortgage-backed2.0 2.0 2.0 
U.S. corporate16.2 18.1 18.1 
Foreign corporate5.6 6.3 6.3 
Total fixed maturity securities30.1 32.8 32.8 
Short-term investments12.0 12.0 
Total investments$42.1 $44.8