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Statutory Financial Information and Restrictions on Dividends and Transfers of Funds (Statutory Surplus) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | $ 610.0 |  | $ 679.1
Statutory surplus | 1,100.9 |  | 1,076.5
Statutory net income | 36.3 | 2.6 |
Additional Borrowing Capacity for Parent | 18.0 |  |
Selective Insurance Company of America [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 261.9 |  | 360.7
Statutory surplus | 385.6 |  | 507.4
Statutory net income | 47.4 | 5.1 |
Selective Way Insurance Company [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 179.6 |  | 169.1
Statutory surplus | 223.2 |  | 221.7
Statutory net income | 7.1 | 2.8 |
Selective Insurance Company of South Carolina [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 72.2 |  | 65.5
Statutory surplus | 93.4 |  | 90.5
Statutory net income | 2.6 | (1.9) |
Selective Insurance Company of the Southeast [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 51.6 |  | 46.8
Statutory surplus | 71.2 |  | 69.3
Statutory net income | 1.6 | (1.5) |
Selective Insurance Company of New York [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 47.4 |  | 43.0
Statutory surplus | 74.7 |  | 73.3
Statutory net income | 2.1 | (1.0) |
Selective Insurance Company of New England [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 2.9 |  | 3.8
Statutory surplus | 32.7 |  | 14.3
Statutory net income | (3.6) | 0.2 |
Selective Auto Insurance Company of New Jersey [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | 9.1 |  | 5.6
Statutory surplus | 59.9 |  | 60.1
Statutory net income | 1.6 | (1.1) |
Mesa Underwriting Specialty Insurance Company [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | (12.5) |  | (15.4)
Statutory surplus | 56.0 |  | 39.9
Statutory net income | (6.5) |  |
Selective Casualty Insurance Company [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | (1.6) |  |
Statutory surplus | 72.9 |  |
Statutory net income | (11.2) |  |
Selective Fire and Casualty Insurance Company [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unassigned surplus | (0.6) |  |
Statutory surplus | 31.3 |  |
Statutory net income | $ (4.8) |  |

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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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