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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":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"1,830 Restricted Stock Units were granted on 02/10/2014, under the A. 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":"F3","text":"On October 5, 2016, the common stock of A. O. Smith Corporation split 2-for1, resulting in the reporting person's ownership of 2,890 additional Restricted Stock Units."}],"balance_after":3950,"derivative":{"exercise_price":49.86,"underlying":"Common Stock","underlying_shares":1830},"source":{"system":"sec-edgar","filing":"0000091142-17-000010","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/91142/000009114217000010/edgar.xml","form_type":"4"}},{"id":4456258,"issuer":{"id":3642,"kind":"organization","name":"SMITH A O CORP"},"owners":[{"id":142538,"kind":"person","name":"Dana Paul R","position":1,"cik":"0001639644","reported_name":"Dana Paul R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP, Global Operations"}}],"security":"Common Stock","published_at":"2017-02-13T21:12:30.000Z","date":"2017-02-10","kind":"tax_withholding","acquired":false,"shares":598,"price":49.86,"value":29816.28,"ownership":{"direct":true},"balance_after":2760,"source":{"system":"sec-edgar","filing":"0000091142-17-000010","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/91142/000009114217000010/edgar.xml","form_type":"4"}},{"id":4456257,"issuer":{"id":3642,"kind":"organization","name":"SMITH A O CORP"},"owners":[{"id":142538,"kind":"person","name":"Dana Paul R","position":1,"cik":"0001639644","reported_name":"Dana Paul R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP, Global Operations"}}],"security":"Common Stock","published_at":"2017-02-13T21:12:30.000Z","date":"2017-02-10","kind":"exercise","acquired":true,"shares":1830,"price":49.86,"value":91243.8,"ownership":{"direct":true},"footnotes":[{"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 764 additional shares of Common Stock."}],"balance_after":3358,"source":{"system":"sec-edgar","filing":"0000091142-17-000010","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/91142/000009114217000010/edgar.xml","form_type":"4"}}]}