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Statutory Financial Information and Restrictions on Dividends and Transfers of Funds (Tables) | 9 Months Ended
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Sep. 30, 2012
Insurance [Abstract] |
Dividends Paid [Text Block] |
Dividends |  |  |  |  |  |  |  |
|  | 2012 |  | Nine Months ended September 30, 2012
($ in millions) |  | Maximum Ordinary Dividend 1 |  | Ordinary Dividends Paid |  | Extraordinary Dividends Paid |  | Total Dividends Paid
SICA |  | $ | 50.7 |  |  | 28.7 |  | 2 | 134.0 |  |  | 162.7 |
Selective Way Insurance Company ("SWIC") |  | 22.2 |  |  | 12.5 |  |  | — |  |  | 12.5 |
Selective Insurance Company of South Carolina ("SICSC") |  | 9.1 |  |  | 0.8 |  |  | — |  |  | 0.8 |
Selective Insurance Company of the Southeast ("SICSE") |  | 6.9 |  |  | 0.5 |  |  | — |  |  | 0.5 |
Selective Insurance Company of New York ("SICNY") |  | 7.3 |  |  | 1.6 |  |  | — |  |  | 1.6 |
Selective Insurance Company of New England ("SICNE") |  | 1.4 |  |  | 1.0 |  |  | — |  |  | 1.0 |
Selective Auto Insurance Company of New Jersey ("SAICNJ") |  | 6.0 |  |  | 0.6 |  |  | — |  |  | 0.6 |
Total |  | $ | 103.6 |  |  | 45.7 |  |  | 134.0 |  |  | 179.7 |
1 Based on December 31, 2011 statutory data. 2 SICA's ordinary dividends paid in the 12-month period ended September 30, 2012 were $50.7 million.
Insurance Subsidiaries Statutory Surplus Data [Text Block] |
|  | Unassigned Surplus |  | Statutory Surplus |  | Statutory Net Income
($ in millions) |  | September 30, 2012 |  | December 31, 2011 |  | September 30, 2012 |  | December 31, 2011 |  | Nine Months ended September 30, 2012 |  | Nine Months ended September 30, 2011
SICA |  | $ | 261.9 |  |  | 360.7 |  |  | $ | 385.6 |  |  | 507.4 |  |  | 47.4 |  |  | 5.1 |
SWIC |  | 179.6 |  |  | 169.1 |  |  | 223.2 |  |  | 221.7 |  |  | 7.1 |  |  | 2.8 |
SICSC |  | 72.2 |  |  | 65.5 |  |  | 93.4 |  |  | 90.5 |  |  | 2.6 |  |  | (1.9 | )
SICSE |  | 51.6 |  |  | 46.8 |  |  | 71.2 |  |  | 69.3 |  |  | 1.6 |  |  | (1.5 | )
SICNY |  | 47.4 |  |  | 43.0 |  |  | 74.7 |  |  | 73.3 |  |  | 2.1 |  |  | (1.0 | )
SICNE |  | 2.9 |  |  | 3.8 |  |  | 32.7 |  |  | 14.3 |  |  | (3.6 | ) |  | 0.2 |
SAICNJ |  | 9.1 |  |  | 5.6 |  |  | 59.9 |  |  | 60.1 |  |  | 1.6 |  |  | (1.1 | )
MUSIC |  | (12.5 | ) |  | (15.4 | ) |  | 56.0 |  |  | 39.9 |  |  | (6.5 | ) |  | N/A |
SCIC |  | (1.6 | ) |  | N/A |  |  | 72.9 |  |  | N/A |  |  | (11.2 | ) |  | N/A |
SFCIC |  | (0.6 | ) |  | N/A |  |  | 31.3 |  |  | N/A |  |  | (4.8 | ) |  | N/A |
Total |  | $ | 610.0 |  |  | 679.1 |  |  | $ | 1,100.9 |  |  | 1,076.5 |  |  | 36.3 |  |  | 2.6 |

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- Definition Tabular disclosure of the dividends paid to the Parent by a Subsidiary. + References No definition available. + Details
Name: | sigi_DividendsPaidTextBlock
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of incurance subsidiaries' statutory surplus, unassigned surplus and statutory net income. + References No definition available. + Details
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Namespace Prefix: | sigi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration