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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event Wildfires struck northern California’s wine region in October 2017, which will result in fourth quarter 2017 catastrophe losses in AFG’s property and casualty insurance segment. Based on information available as of the filing of this Form 10-Q, management estimates a pretax loss from these events, net of reinsurance and inclusive of reinstatement premiums and other associated offsets, in the range of $20 million to $25 million. At the midpoint of that range, AFG’s earnings per share would be negatively impacted by approximately $0.18.