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O. Smith Nonqualified Deferred Compensation Plan based on the  average of the high and low price of Common Stock on April 13, 2017."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The Plan permits the participant to defer receipt of the award, and Mr. Smith has made a deferral."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The Plan permits the participant to defer receipt of the award, and Mr. Smith has made a deferral."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"On October 5, 2016, the common stock of A. O. Smith Corporation split 2-for1, resulting in the reporting person's ownership of 57,106 additional Restricted Stock Units.The Restricted Stock Units receive a quarterly dividend pursuant to a dividend reinvestment feature of the A. O. Smith Nonqualified Deferred Compensation Plan.  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