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Stockholders' Equity and Comprehensive Income (Maximum Payments of Ordinary Dividends) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011
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Maximum Ordinary Dividends | $ 103.6
Selective Insurance Company Of America [Member] |
Maximum Ordinary Dividends | 50.7
Selective Way Insurance Company [Member] |
Maximum Ordinary Dividends | 22.2
Selective Insurance Company Of South Carolina [Member] |
Maximum Ordinary Dividends | 9.1
Selective Insurance Company Of The Southeast [Member] |
Maximum Ordinary Dividends | 6.9
Selective Insurance Company Of New York [Member] |
Maximum Ordinary Dividends | 7.3
Selective Insurance Company Of New England [Member] |
Maximum Ordinary Dividends | 1.4
Selective Auto Insurance Company Of New Jersey [Member] |
Maximum Ordinary Dividends | 6.0
Montpelier U S Insurance Company [Member] |
Maximum Ordinary Dividends | $ 0

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- Definition The amount of dividends that can be declared or paid with approval of relevant regulatory agencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph e Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
Name: | us-gaap_AmountAvailableForDividendDistributionWithApprovalFromRegulatoryAgencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant