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Statutory Financial Information, Capital Requirements and Restrictions on Dividends and Transfers of Funds (Statutory Financial Information) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statutory unassigned surplus $ 571.6 $ 679.1  
Statutory surplus 1,050.1 1,062.7  
Statutory net income 50.4 26.5 86.9
Selective Insurace Company of America (SICA) [Member]
      
Statutory unassigned surplus 246.2 360.7  
Statutory surplus 369.9 507.4  
Statutory net income 29.8 15.2 55.4
Selective Way Insurance Company (SWIC) [Member]
      
Statutory unassigned surplus 167.6 169.1  
Statutory surplus 211.2 221.7  
Statutory net income 10.1 7.8 6.2
Selective Insurance Company of South Carolina (SICSC) [Member]
      
Statutory unassigned surplus 70.1 65.5  
Statutory surplus 91.4 90.5  
Statutory net income 2.8 0.7 7.3
Selective Insurance Company of the Southeast (SICSE) [Member]
      
Statutory unassigned surplus 50.1 46.8  
Statutory surplus 69.7 69.3  
Statutory net income 1.6 0.3 5.2
Selective Insurance Company of New York (SICNY) [Member]
      
Statutory unassigned surplus 45.3 43.0  
Statutory surplus 72.6 73.3  
Statutory net income 2.7 1.5 6.9
Selective Insurance Company of New England (SICNE) [Member]
      
Statutory unassigned surplus 2.7 3.8  
Statutory surplus 32.5 14.3  
Statutory net income 0.6 0.3 0.8
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member]
      
Statutory unassigned surplus 7.6 5.6  
Statutory surplus 45.9 46.3  
Statutory net income 1.5 0.7 5.1
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member]
      
Statutory unassigned surplus (14.9) (15.4)  
Statutory surplus 53.6 39.9  
Statutory net income 0.9 0 0
Selective Casualty Insurance Company (SCIC) [Member]
      
Statutory unassigned surplus (2.2) 0  
Statutory surplus 72.2 0  
Statutory net income 0.2 0 0
Selective Fire and Casualty Insurance Company (SFCIC) [Member]
      
Statutory unassigned surplus (0.9) 0  
Statutory surplus 31.1 0  
Statutory net income $ 0.2 $ 0 $ 0