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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory unassigned surplus	$ 1,908.1	$ 1,825.4
Statutory surplus	2,473.7	2,391.0
Statutory net income	264.4	338.3	$ 242.4
Selective Insurace Company of America (SICA) [Member]
Statutory unassigned surplus	686.6	673.1
Statutory surplus	851.8	838.3
Statutory net income	103.1	134.7	81.8
Selective Way Insurance Company (SWIC) [Member]
Statutory unassigned surplus	461.9	436.4
Statutory surplus	517.8	492.4
Statutory net income	69.6	74.5	54.0
Selective Insurance Company of South Carolina (SICSC) [Member]
Statutory unassigned surplus	164.1	166.3
Statutory surplus	198.4	200.6
Statutory net income	17.0	24.2	20.8
Selective Insurance Company of the Southeast (SICSE) [Member]
Statutory unassigned surplus	135.9	132.7
Statutory surplus	163.5	160.3
Statutory net income	14.2	19.4	16.8
Selective Insurance Company of New York (SICNY) [Member]
Statutory unassigned surplus	137.4	127.0
Statutory surplus	165.1	154.7
Statutory net income	13.2	18.6	15.3
Selective Insurance Company of New England (SICNE) [Member]
Statutory unassigned surplus	38.2	34.5
Statutory surplus	69.3	65.6
Statutory net income	5.1	7.5	6.8
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member]
Statutory unassigned surplus	102.2	90.4
Statutory surplus	147.1	135.2
Statutory net income	12.7	16.7	12.9
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member]
Statutory unassigned surplus	52.8	47.4
Statutory surplus	122.3	116.9
Statutory net income	9.7	13.9	11.4
Selective Casualty Insurance Company (SCIC) [Member]
Statutory unassigned surplus	91.4	83.4
Statutory surplus	167.9	159.9
Statutory net income	14.0	20.6	16.2
Selective Fire and Casualty Insurance Company (SFCIC) [Member]
Statutory unassigned surplus	37.6	34.2
Statutory surplus	70.5	67.1
Statutory net income	$ 5.8	$ 8.2	$ 6.4

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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