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Property and Casualty Insurance Reserves - Reserve Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross of Reinsurance at Beginning of Year $ 1,982.5  
Incurred Losses and LAE Related to:    
Incurred Losses and LAE Related to Prior Years 0.1 $ 0.9
Paid Losses and LAE Related to:    
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period 1,999.5  
Property, Liability and Casualty Insurance Product Line    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross of Reinsurance at Beginning of Year 1,982.5 1,969.8
Less Reinsurance Recoverables at Beginning of Year 50.1 65.6
Property and Casualty Insurance Reserves - Net of Reinsurance at Beginning of Year 1,932.4 1,904.2
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance 0.0 0.0
Incurred Losses and LAE Related to:    
Incurred Losses and LAE Related to Current Year 777.0 738.1
Incurred Losses and LAE Related to Prior Years 0.1 0.9
Total Incurred Losses and LAE 777.1 739.0
Paid Losses and LAE Related to:    
Paid Losses and LAE Related to Current Year 258.0 257.0
Paid Losses and LAE Related to Prior Years 500.3 505.8
Total Paid Losses and LAE 758.3 762.8
Property and Casualty Insurance Reserves - Net of Reinsurance at End of Period 1,951.2 1,880.4
Plus Reinsurance Recoverables at End of Period 48.3 61.2
Property and Casualty Insurance Reserves - Gross of Reinsurance at End of Period $ 1,999.5 $ 1,941.6