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Segment Information - Summary of Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net premiums earned $ 1,410,400 $ 1,320,652 $ 4,060,208 $ 3,723,355
Total incurred losses and loss adjustment expenses     3,043,596 2,759,117
Policy acquisition costs 236,164 230,293 692,765 630,016
Other operating expenses 108,518 86,861 283,996 245,651
Net investment income 83,970 72,738 244,208 206,726
Net realized investment gains 84,451 114,446 131,251 155,536
Other income 6,105 22,538 21,022 23,837
Interest expense (7,181) (7,717) (21,562) (23,288)
Income before income taxes 350,318 287,064 414,770 451,382
Net income 280,403 230,856 338,547 366,886
Operating Segments        
Segment Reporting Information [Line Items]        
Net premiums earned 1,410,400 1,320,700 4,060,200 3,723,400
Losses 739,100 786,200 2,605,600 2,372,800
Loss adjustment expenses 143,700 132,200 438,000 386,300
Total incurred losses and loss adjustment expenses 882,800 918,400 3,043,600 2,759,100
Policy acquisition costs 236,200 230,300 692,800 630,000
Other operating expenses 108,500 86,800 284,000 245,600
Underwriting gain (loss) 182,900 85,200 39,800 88,700
Net investment income 84,000 72,700 244,200 206,700
Net realized investment gains 84,500 114,400 131,300 155,500
Other income 6,100 22,500 21,100 23,800
Interest expense (7,200) (7,700) (21,600) (23,300)
Income before income taxes 350,300 287,100 414,800 451,400
Net income 280,400 230,900 338,500 366,900
Property & Casualty        
Segment Reporting Information [Line Items]        
Net premiums earned 1,402,961 1,313,282 4,038,061 3,701,347
Property & Casualty | Operating Segments        
Segment Reporting Information [Line Items]        
Net premiums earned 1,403,000 1,313,300 4,038,100 3,701,300
Losses 735,300 782,400 2,594,200 2,361,500
Loss adjustment expenses 143,200 131,600 436,500 384,900
Total incurred losses and loss adjustment expenses 878,500 914,000 3,030,700 2,746,400
Policy acquisition costs 231,800 226,300 682,600 620,200
Other operating expenses 107,600 85,900 281,700 243,300
Underwriting gain (loss) 185,100 87,100 43,100 91,400
Other | Operating Segments        
Segment Reporting Information [Line Items]        
Net premiums earned 7,400 7,400 22,100 22,100
Losses 3,800 3,800 11,400 11,300
Loss adjustment expenses 500 600 1,500 1,400
Total incurred losses and loss adjustment expenses 4,300 4,400 12,900 12,700
Policy acquisition costs 4,400 4,000 10,200 9,800
Other operating expenses 900 900 2,300 2,300
Underwriting gain (loss) $ (2,200) $ (1,900) $ (3,300) $ (2,700)