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Indebtedness (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2005 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2004 | Dec. 31, 2009 | Jan. 31, 2015 | Dec. 31, 2011
Aggregate investment in FHLBI |  |  | $ 2.9 sigi_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAggregateInvestment | $ 2.9 sigi_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAggregateInvestment |  |  |  |
Borrowing threshold of FHLBI |  |  | 20 sigi_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMultipleAmount |  |  |  |  |
FLHBI Borrowing |  |  | 45 us-gaap_FederalHomeLoanBankAdvancesLongTerm |  |  |  |  |
Maximum FHLBI borrowing percentage permitted by line of credit |  |  | 10.00%sigi_LineOfCreditFederalHomeLoanBankMaximumBorrowingPercentagePermitted |  |  |  |  |
Long-term Line of Credit |  |  | 0 us-gaap_LineOfCredit |  |  |  |  |
Five Point Eight Hundred Seventy Five Percent Senior Notes Due 2043 [Member] |  |  |  |  |  |  |  |
Aggregate principal amount of notes | 185 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = sigi_FivePointEightHundredSeventyFiveMember |  |  |  |  |  |  |
Bond proceeds to Insurance Subsidiaries as capital | 57.1 sigi_BondProceeds / us-gaap_LongtermDebtTypeAxis = sigi_FivePointEightHundredSeventyFiveMember |  |  |  |  |  |  |
Redemption Of Seven Point Fifty Percent Junior Notes [Member] |  |  |  |  |  |  |  |
Aggregate principal amount of notes | 100 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = sigi_RedemptionOfSevenPointFiftyPercentJuniorNotesMember |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost | 3.3 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_LongtermDebtTypeAxis = sigi_RedemptionOfSevenPointFiftyPercentJuniorNotesMember |  |  |  |  |  |  |
Seven Point Twenty Five Percent Senior Notes due 2034 [Member] |  |  |  |  |  |  |  |
Aggregate principal amount of notes |  |  |  |  | 50 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = sigi_SevenPointTwentyFivePercentSeniorNotesMember |  |  |
Discount for notes issued |  |  |  |  | 0.1 sigi_DebtInstrumentDiscount / us-gaap_LongtermDebtTypeAxis = sigi_SevenPointTwentyFivePercentSeniorNotesMember |  |  |
Effective yield |  |  |  |  | 7.27%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = sigi_SevenPointTwentyFivePercentSeniorNotesMember |  |  |
Bond proceeds to Insurance Subsidiaries as capital |  |  |  |  | 25.0 sigi_BondProceeds / us-gaap_LongtermDebtTypeAxis = sigi_SevenPointTwentyFivePercentSeniorNotesMember |  |  |
Acceleration of principal |  |  | 10 sigi_PrincipalAccelerationAmountStateofDefault / us-gaap_LongtermDebtTypeAxis = sigi_SevenPointTwentyFivePercentSeniorNotesMember |  |  |  |  |
Six Point Seventy Percent Senior Notes due 2035 [Member] |  |  |  |  |  |  |  |
Aggregate principal amount of notes |  | 100 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = sigi_SixPointSeventyPercentSeniorNotesMember |  |  |  |  |  |
Discount for notes issued |  | 0.7 sigi_DebtInstrumentDiscount / us-gaap_LongtermDebtTypeAxis = sigi_SixPointSeventyPercentSeniorNotesMember |  |  |  |  |  |
Effective yield |  | 6.754%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = sigi_SixPointSeventyPercentSeniorNotesMember |  |  |  |  |  |
Acceleration of principal |  |  | 10 sigi_PrincipalAccelerationAmountStateofDefault / us-gaap_LongtermDebtTypeAxis = sigi_SixPointSeventyPercentSeniorNotesMember |  |  |  |  |
Net proceeds from the issuance |  | 50 us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_LongtermDebtTypeAxis = sigi_SixPointSeventyPercentSeniorNotesMember |  |  |  |  |  |
Two Point Ninety Percent Borrowing From Federal Home Loan Bank due Dec. 15, 2014[Member] |  |  |  |  |  |  |  |
FLHBI Borrowing |  |  |  |  |  | 13 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = sigi_TwoPointNinetyPercentBorrowingFromFederalHomeLoanBankMember |  |
Unpaid principal amount interest rate |  |  |  |  |  | 2.90%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = sigi_TwoPointNinetyPercentBorrowingFromFederalHomeLoanBankMember |  |
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member] |  |  |  |  |  |  |  |
FLHBI Borrowing |  |  |  |  |  |  | 15 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = sigi_ZeroPointSixtyThreePercentBorrowingFromFederalHomeLoanBankDueJuly222016Member |
Unpaid principal amount interest rate |  |  |  |  |  |  | 0.63%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = sigi_ZeroPointSixtyThreePercentBorrowingFromFederalHomeLoanBankDueJuly222016Member |
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank due Dec. 16, 2016 [Member] |  |  |  |  |  |  |  |
FLHBI Borrowing |  |  |  |  |  |  |  | 45 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = sigi_OnePointTwentyFivePercentBorrowingFromFederalHomeLoanBankMember
Unpaid principal amount interest rate |  |  |  |  |  |  |  | 1.25%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = sigi_OnePointTwentyFivePercentBorrowingFromFederalHomeLoanBankMember
Line of Credit expires Sept 26,2017 [Member] |  |  |  |  |  |  |  |
Acceleration of principal |  |  | 20 sigi_PrincipalAccelerationAmountStateofDefault / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |
Line of credit borrowing capacity |  |  | 30 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  | $ 50 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |

X
- Definition The cash inflow from the bond proceeds contributed to the Insurance Subsidiaries as capital. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument. + References No definition available. + Details
Name: | sigi_DebtInstrumentDiscount
Namespace Prefix: | sigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition States the amount of the aggregate investment in the Federal Home Loan Bank common stock outstanding as of the Balance Sheet date. + References No definition available. + Details
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Namespace Prefix: | sigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This amount is a multiple of the Company's aggregate investment in the Federal Home Loan Bank representing the Company's ability to borrow from the Federal Home Loan Bank. + References No definition available. + Details
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Namespace Prefix: | sigi_
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Balance Type: | na
Period Type: | instant

X
- Definition The maximum collaterized borrowing percentage of the subsidiary's admitted assets from the Federal Home Loan Bank that are permitted by the Line of Credit. + References No definition available. + Details
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Namespace Prefix: | sigi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the amount of concurrent debt outstanding which, if accelerated for any reason of default, causes an event of default on the referenced debt. + References No definition available. + Details
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Namespace Prefix: | sigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Period Type: | instant

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

X
- Definition States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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