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SCHEDULE I - SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES
 12 Months Ended
Dec. 31, 2018
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
December 31, 2018 
($ millions)
December 31, 2018
Cost or
amortized
cost (1)
Fair
value
Amount at
which shown
in the
balance sheet
Available-for-sale fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies$438.4 $432.4 $432.4 
Obligations of states and political subdivisions408.2 414.6 414.6 
Corporate securities551.7 540.6 540.6 
U.S. government agencies residential mortgage-backed securities789.9 771.9 771.9 
Total available-for-sale fixed maturities2,188.2 2,159.5 2,159.5 
(1)Original cost of fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts.