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Acquisition
6 Months Ended
Jun. 30, 2011
Acquisition [Abstract]  
Acquisition
B.   Acquisition
    Vanliner Group, Inc. (“Vanliner”) In July 2010, National Interstate (“NATL”), a 52%-owned subsidiary of AFG, completed the acquisition of Vanliner, a market leader in providing insurance for the moving and storage industry, for $114 million (including post-closing adjustments). Vanliner’s moving and storage insurance premiums associated with policies in force as of December 31, 2010, totaled approximately $90 million, representing approximately 78% of its total business.