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Contingencies
 3 Months Ended
Mar. 31, 2012
Contingencies [Abstract]  
Contingencies Contingencies
L. Contingencies

There have been no significant changes to the matters discussed and referred to in Note M – “Contingencies” of AFG’s 2011 Form 10-K covering 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.