XML 143 R116.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Statutory Financial Information, Capital Requirements and Restrictions on Dividends and Transfers of Funds (Statutory Financial Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statutory unassigned surplus | $ 890.7 | $ 772.2 |
Statutory surplus | 1,426.3 | 1,307.8 |
Statutory net income | 195.8 | 190.3 | $ 122.2
Selective Insurace Company of America (SICA) [Member] |  |  |
Statutory unassigned surplus | 366.6 | 338.8 |
Statutory surplus | 520.8 | 493.0 |
Statutory net income | 69.6 | 83.9 | 53.1
Selective Way Insurance Company (SWIC) [Member] |  |  |
Statutory unassigned surplus | 223.6 | 201.3 |
Statutory surplus | 272.6 | 250.3 |
Statutory net income | 42.3 | 37.0 | 27.5
Selective Insurance Company of South Carolina (SICSC) [Member] |  |  |
Statutory unassigned surplus | 96.6 | 83.9 |
Statutory surplus | 127.9 | 115.1 |
Statutory net income | 15.9 | 14.0 | 8.2
Selective Insurance Company of the Southeast (SICSE) [Member] |  |  |
Statutory unassigned surplus | 70.7 | 59.3 |
Statutory surplus | 96.2 | 84.9 |
Statutory net income | 12.1 | 10.5 | 6.0
Selective Insurance Company of New York (SICNY) [Member] |  |  |
Statutory unassigned surplus | 65.3 | 54.9 |
Statutory surplus | 93.0 | 82.6 |
Statutory net income | 12.7 | 10.3 | 6.9
Selective Insurance Company of New England (SICNE) [Member] |  |  |
Statutory unassigned surplus | 9.2 | 5.3 |
Statutory surplus | 39.4 | 35.4 |
Statutory net income | 5.5 | 4.4 | 3.1
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |  |
Statutory unassigned surplus | 26.4 | 18.4 |
Statutory surplus | 69.2 | 61.3 |
Statutory net income | 10.8 | 9.1 | 2.5
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |  |
Statutory unassigned surplus | 7.0 | (1.7) |
Statutory surplus | 75.5 | 66.8 |
Statutory net income | 9.5 | 7.3 | 5.2
Selective Casualty Insurance Company (SCIC) [Member] |  |  |
Statutory unassigned surplus | 17.8 | 8.2 |
Statutory surplus | 92.3 | 82.7 |
Statutory net income | 12.1 | 9.6 | 6.6
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |  |
Statutory unassigned surplus | 7.5 | 3.8 |
Statutory surplus | 39.4 | 35.7 |
Statutory net income | $ 5.3 | $ 4.2 | $ 3.1

X
- Definition The amount of statutory unassigned surplus as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References No definition available. + Details
Name: | sigi_StatutoryAccountingPracticesStatutoryUnassignedSurplus
Namespace Prefix: | sigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: 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 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 + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveInsuranceCompanyOfAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveWayInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveInsuranceCompanyOfSouthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveInsuranceCompanyOfSoutheastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveInsuranceCompanyOfNewYorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveInsuranceCompanyOfNewEnglandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveAutoInsuranceCompanyOfNewJerseyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_MesaUnderwritingSpecialtyInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveCasualtyInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sigi_StatutoryDataAxis=sigi_SelectiveFireAndCasualtyInsuranceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |