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Acquisition of Business
3 Months Ended
Mar. 31, 2017
Disclosure Text Block [Abstract]  
Acquisition of Business
Acquisition of Business

Acquisition of Noncontrolling Interest in National Interstate Corporation   In November 2016, AFG acquired the 49% of National Interstate Corporation (“NATL”) not previously owned by AFG’s wholly-owned subsidiary, Great American Insurance Company, for $315 million ($32.00 per share) in a merger transaction. In addition, NATL paid a one-time special cash dividend of $0.50 per share to its shareholders immediately prior to the merger closing. Because NATL was already a consolidated subsidiary of AFG prior to the merger, the acquisition was accounted for as an equity transaction.