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O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3.  1,830 Restricted Stock Units vested on 02/10/2017.  As a result of vesting, the Company is obligated to deliver 1,830 shares of Common Stock to the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On October 5, 2016, the common stock of A. O. Smith Corporation split 2-for1, resulting in the reporting person's ownership of 1,460 additional shares of Common Stock."}],"balance_after":4750,"source":{"system":"sec-edgar","filing":"0000091142-17-000013","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/91142/000009114217000013/edgar.xml","form_type":"4"}}]}