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Property and Casualty Insurance Reserves - Reserve Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross of Reinsurance at Beginning of Year $ 2,756.9  
Incurred Losses and Loss Adjustment Expenses (“ LAE”) Related to:    
Incurred Losses and LAE Related to Prior Years   $ (2.7)
Paid Losses and LAE Related to:    
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period 2,721.1  
Property, Liability and Casualty Insurance Product Line    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross of Reinsurance at Beginning of Year 2,756.9 2,772.7
Less Reinsurance Recoverables at Beginning of Year 39.6 41.9
Property and Casualty Insurance Reserves, Net of Reinsurance at Beginning of Year 2,717.3 2,730.8
Incurred Losses and Loss Adjustment Expenses (“ LAE”) Related to:    
Incurred Losses and LAE Related to Current Year 944.0 1,041.9
Incurred Losses and LAE Related to Prior Years 41.9 (2.7)
Total Incurred Losses and LAE 985.9 1,039.2
Paid Losses and LAE Related to:    
Paid Losses and LAE Related to Current Year 325.5 373.9
Paid Losses and LAE Related to Prior Years 690.9 676.9
Total Paid Losses and LAE 1,016.4 1,050.8
Property and Casualty Insurance Reserves, Net of Reinsurance at End of Period 2,686.8 2,719.2
Plus Reinsurance Recoverables at End of Period 34.3 40.9
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period $ 2,721.1 $ 2,760.1