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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]    
Incurred Losses and LAE Related to Prior Years $ 17.0 $ 67.9
Specialty Personal Automobile    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Incurred Losses and LAE Related to Prior Years 7.7 40.0
Commercial Automobile    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Incurred Losses and LAE Related to Prior Years (2.6) 15.2
Non-Core Operations    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Incurred Losses and LAE Related to Prior Years $ 11.9 $ 12.7