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Property and Casualty Insurance Reserves (Tables)
3 Months Ended
Mar. 31, 2024
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]  
Liability for Unpaid Claims Adjustment Expense by Expense Type three months ended March 31, 2024 and 2023 was:
 Three Months Ended
(Dollars in Millions)Mar 31,
2024
Mar 31,
2023
Property and Casualty Insurance Reserves:
Gross of Reinsurance at Beginning of Year$2,680.5 $2,756.9 
Less Reinsurance Recoverables at Beginning of Year27.8 39.6 
Property and Casualty Insurance Reserves, Net of Reinsurance at Beginning of Year2,652.7 2,717.3 
Incurred Losses and LAE related to:
Current Year686.1 944.0 
Prior Years8.8 41.9 
Total Incurred Losses and LAE694.9 985.9 
Paid Losses and LAE related to:
Current Year213.9 325.5 
Prior Years562.9 690.9 
Total Paid Losses and LAE776.8 1,016.4 
Property and Casualty Insurance Reserves, Net of Reinsurance at End of Period2,570.8 2,686.8 
Plus Reinsurance Recoverables at End of Period26.4 34.3 
Property and Casualty Insurance Reserves, Gross of Reinsurance at End of Period$2,597.2 $2,721.1