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Segment Information - Schedule of Return on Equity (Details)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
ROE 14.40% 11.50%
Operating Segments | Total Insurance Operations    
Segment Reporting Information [Line Items]    
ROE 4.80% 2.20%
Operating Segments | Standard Commercial Lines    
Segment Reporting Information [Line Items]    
ROE 3.50% 1.20%
Operating Segments | Standard Personal Lines    
Segment Reporting Information [Line Items]    
ROE 0.20% (0.60%)
Operating Segments | E&S Lines    
Segment Reporting Information [Line Items]    
ROE 1.10% 1.60%
Operating Segments | Investments    
Segment Reporting Information [Line Items]    
Net investment income earned 12.80% 12.30%
Net realized and unrealized investment gains (losses) 0.00% (0.20%)
ROE 12.80% 12.10%
Other    
Segment Reporting Information [Line Items]    
ROE (3.20%) (2.80%)