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Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds (Tables)

12 Months Ended

Dec. 31, 2017

Insurance [Abstract]

Schedule of Insurance Subsidiaries Statutory Surplus Data

		State of Domicile		Unassigned Surplus							Statutory Surplus						Statutory Net Income
($ in millions)				2017				2016			2017			2016			2017			2016			2015
SICA		New Jersey		$	455.5			414.4			609.7			568.6			84.6			72.2			69.6
Selective Way Insurance Company ("SWIC")		New Jersey		276.1				260.5			325.1			309.5			43.6			41.2			42.3
SICSC		Indiana		112.9				110.6			144.1			141.9			17.9			17.4			15.9
SICSE		Indiana		86.2				83.5			111.8			109.1			14.7			13.4			12.1
SICNY		New York		78.8				74.1			106.5			101.8			13.4			12.9			12.7
Selective Insurance Company of New England ("SICNE")		New Jersey		16.1				13.6			46.3			43.7			6.3			5.9			5.5
Selective Auto Insurance Company of New Jersey ("SAICNJ")		New Jersey		42.1				36.9			84.9			79.8			11.4			11.5			10.8
MUSIC		New Jersey		21.4				16.7			89.9			85.2			10.3			9.7			9.5
Selective Casualty Insurance Company ("SCIC")		New Jersey		34.5				26.6			109.0			101.0			13.4			12.6			12.1
Selective Fire and Casualty Insurance Company ("SFCIC")		New Jersey		13.7				11.3			45.6			43.2			5.6			5.5			5.3
Total				$	1,137.3			1,048.2			1,672.9			1,583.8			221.2			202.3			195.8

Schedule of Insurance Subsidiaries Dividend Paid To Parent

Dividends				Twelve Months ended December 31, 2017
($ in millions)		State of Domicile		Ordinary Dividends Paid
SICA		New Jersey		$	28.0
SWIC		New Jersey		19.0
SICSC		Indiana		10.0
SICSE		Indiana		7.5
SICNY		New York		4.5
SICNE		New Jersey		2.0
SAICNJ		New Jersey		2.5
MUSIC		New Jersey		2.1
SCIC		New Jersey		3.0
SFCIC		New Jersey		1.5
Total				$	80.1

Schedule of Maximum Ordinary Dividends Paid to Parent by Insurance Subsidiaries

				2018
($ in millions)		State of Domicile		Maximum Ordinary Dividends
SICA		New Jersey		$	77.6
SWIC		New Jersey		43.3
SICSC		Indiana		17.9
SICSE		Indiana		14.7
SICNY		New York		10.7
SICNE		New Jersey		6.2
SAICNJ		New Jersey		11.3
MUSIC		New Jersey		10.3
SCIC		New Jersey		13.4
SFCIC		New Jersey		5.6
Total				$	211.0

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