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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.

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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 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

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- 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

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