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Stockholders' Equity and Comprehensive Income (Maximum Payments of Ordinary Dividends) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
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