Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies	ContingenciesThere have been no significant changes to the matters discussed and referred to in Note N — “Contingencies” of AFG’s 2022 Form 10-K, which covers property and casualty insurance reserves for claims related to environmental exposures, asbestos and other mass tort claims and environmental and occupational injury and disease claims of subsidiaries’ former railroad and manufacturing operations.