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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
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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

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- Definition This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50 percent or less owned persons accounted for using the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount of dividends that can be declared or paid with approval of regulatory agency. + References No definition available. + Details
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