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Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds - Schedule of Insurance Subsidiaries Dividend Paid To Parent (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid $ 43.8
Maximum Ordinary Dividends 290.3
Selective Insurace Company of America (SICA)  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 20.0
Maximum Ordinary Dividends 99.7
Selective Way Insurance Company ("SWIC")  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 15.0
Maximum Ordinary Dividends 59.3
Selective Insurance Company of South Carolina (SICSC)  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 0.0
Maximum Ordinary Dividends 25.4
Selective Insurance Company of the Southeast (SICSE)  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 1.3
Maximum Ordinary Dividends 20.0
Selective Insurance Company of New York (SICNY)  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 0.9
Maximum Ordinary Dividends 19.0
Selective Insurance Company of New England ("SICNE")  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 0.5
Maximum Ordinary Dividends 8.0
Selective Auto Insurance Company of New Jersey ("SAICNJ")  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 1.1
Maximum Ordinary Dividends 17.2
Mesa Underwriters Specialty Insurance Company ("MUSIC")  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 2.2
Maximum Ordinary Dividends 14.2
Selective Casualty Insurance Company ("SCIC")  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 2.8
Maximum Ordinary Dividends 19.4
Selective Fire and Casualty Insurance Company ("SFCIC")  
Statutory Accounting Practices [Line Items]  
Ordinary Dividends Paid 0.0
Maximum Ordinary Dividends $ 8.1