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Contingencies
9 Months Ended
Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]  
Contingencies
M.     Contingencies

Except as discussed in Management’s Discussion and AnalysisSpecial Asbestos and Environmental Reserve Charges,” there have been no significant changes to the matters discussed and referred to in Note M — “Contingencies” of AFG’s 2011 Form 10-K, which covers property and casualty insurance reserves for claims related to environmental exposures, asbestos and other mass tort claims, as well as environmental and occupational injury and disease claims of former subsidiary railroad and manufacturing operations.