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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]        
Actuary estimate period used for ultimate and LAE 10 years      
Incurred losses and LAE related to prior year (favorable) adverse development $ 22.6   $ (14.6)  
Reinsurance recoverables 78.7 $ 86.5    
Non-Core Operations        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and LAE related to prior year (favorable) adverse development   24.8    
Commercial Automobile        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and LAE related to prior year (favorable) adverse development 7.2      
Specialty Automobile        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and LAE related to prior year (favorable) adverse development   108.7 (17.6)  
Commercial Automobile        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and LAE related to prior year (favorable) adverse development   24.2 3.6  
Property and Liability Insurance        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Incurred losses and LAE related to prior year (favorable) adverse development 29.8 159.8 (14.6)  
Reinsurance recoverables $ 24.3 $ 27.8 $ 39.6 $ 41.9