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The shares underlying the 2019-2021 PSUs became payable as of February 24, 2022 following certification of the Issuer's achievement of such performance criteria by the Personnel and Compensation Committee of the Issuer's Board of Directors."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This amount includes 1,916.2286 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan.  Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method.  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Ms. Powers holds approximately 1,610 units, which represent interests in the Company's stock fund."}],"balance_after":78660.8834,"source":{"system":"sec-edgar","filing":"0001209191-20-012229","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919120012229/doc4.xml","form_type":"4"}},{"id":3437890,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, par value $0.10 per share","published_at":"2019-08-15T10:57:55.000Z","date":"2019-08-14","kind":"purchase","acquired":true,"shares":2000,"price":18.17,"value":36340.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amount includes 1,925.63662 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,611 units, which represent interests in the Company's stock fund."}],"balance_after":80185.4431,"source":{"system":"sec-edgar","filing":"0001209191-19-046027","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119046027/doc4.xml","form_type":"4"}},{"id":3624269,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, par value $0.10 per share","published_at":"2019-03-02T00:53:57.000Z","date":"2019-02-28","kind":"tax_withholding","acquired":false,"shares":8447,"price":28.92,"value":244287.24,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F6","text":"Shares withheld for payment of taxes in connection with the February 28, 2019 settlement of the 2016-2018 PSUs."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 28, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,693.349759 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,422 units, which represent interests in the Company's stock fund."}],"balance_after":78077.8038,"source":{"system":"sec-edgar","filing":"0001209191-19-015247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119015247/doc4.xml","form_type":"4"}},{"id":3624268,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, par value $0.10 per share","published_at":"2019-03-02T00:53:57.000Z","date":"2019-02-28","kind":"exercise","acquired":true,"shares":18571,"price":28.92,"value":537073.32,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Settlement of performance-vested restricted stock units that were granted in 2016, the vesting of which was contingent upon the Issuer's achievement of specified performance criteria during the period from January 1, 2016 through December 31, 2018 (the \"2016-2018 PSUs\").  The Issuer's partial achievement of such performance criteria was certified, and a corresponding portion of the shares underlying the 2016-2018 PSUs became payable, as of February 28, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 28, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,693.349759 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,422 units, which represent interests in the Company's stock fund."}],"balance_after":86524.8038,"source":{"system":"sec-edgar","filing":"0001209191-19-015247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119015247/doc4.xml","form_type":"4"}},{"id":3624267,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, par value $0.10 per share","published_at":"2019-03-02T00:53:57.000Z","date":"2019-02-27","kind":"grant","acquired":true,"shares":13843,"price":29.255,"value":404976.965,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Award of restricted stock units granted on February 27, 2019, which are settled in shares of stock upon vesting.  The award vests in three equal annual installments on each of the first three anniversaries of the grant date."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 27, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,693.349759 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,422 units, which represent interests in the Company's stock fund."}],"balance_after":67953.8038,"source":{"system":"sec-edgar","filing":"0001209191-19-015247","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119015247/doc4.xml","form_type":"4"}},{"id":3629782,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2019-02-28T01:42:46.000Z","date":"2019-02-25","kind":"tax_withholding","acquired":false,"shares":1872,"price":29.13,"value":54531.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Shares withheld for payment of taxes on restricted stock units awarded on February 23, 2017. One-third of such restricted stock units vested by their terms on February 25, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 25, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,817.997257 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,528 units, which represent interests in the Company's stock fund."}],"balance_after":54110.8038,"source":{"system":"sec-edgar","filing":"0001209191-19-014328","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119014328/doc4.xml","form_type":"4"}},{"id":3629781,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2019-02-28T01:42:46.000Z","date":"2019-02-25","kind":"tax_withholding","acquired":false,"shares":3078,"price":29.13,"value":89662.14,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld for payment of taxes on restricted stock units awarded on February 25, 2016. One-third of such restricted stock units vested by their terms on February 25, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 25, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,817.997257 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,528 units, which represent interests in the Company's stock fund."}],"balance_after":55982.8038,"source":{"system":"sec-edgar","filing":"0001209191-19-014328","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119014328/doc4.xml","form_type":"4"}},{"id":3639577,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2019-02-22T23:38:54.000Z","date":"2019-02-20","kind":"tax_withholding","acquired":true,"shares":1489,"price":28.8,"value":42883.2,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld for payment of taxes on restricted stock units awarded on February 20, 2018. One-third of such restricted stock units vested by their terms on February 20, 2019."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 20, 2019."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,817.997257 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,528 units, which represent interests in the Company's stock fund."}],"balance_after":59060.8038,"source":{"system":"sec-edgar","filing":"0001209191-19-012765","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919119012765/doc4.xml","form_type":"4"}},{"id":4031367,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2018-02-28T00:37:28.000Z","date":"2018-02-26","kind":"tax_withholding","acquired":false,"shares":2074,"price":27.12,"value":56246.88,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Shares withheld for payment of taxes on restricted stock units awarded on February 25, 2016.  One-third of such restricted stock units vested by their terms on February 26, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 26, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,693.349759 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,422 units, which represent interests in the Company's stock fund."}],"balance_after":60524.7476,"source":{"system":"sec-edgar","filing":"0001209191-18-014258","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919118014258/doc4.xml","form_type":"4"}},{"id":4031366,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2018-02-28T00:37:28.000Z","date":"2018-02-23","kind":"tax_withholding","acquired":false,"shares":1255,"price":27,"value":33885.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld for payment of taxes on restricted stock units awarded on February 23, 2017. One-third of such restricted stock units vested by their terms on February 23, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the average of the high and low trading prices for one share of the Issuer's common stock on the New York Stock Exchange on February 23, 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This amount includes 1,693.349759 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,422 units, which represent interests in the Company's stock fund."}],"balance_after":62598.7476,"source":{"system":"sec-edgar","filing":"0001209191-18-014258","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919118014258/doc4.xml","form_type":"4"}},{"id":4041447,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2018-02-22T23:49:37.000Z","date":"2018-02-20","kind":"grant","acquired":true,"shares":8976,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Award of restricted stock units, which are settled in shares of stock upon vesting.  The award vests in three equal annual installments on each of the first three anniversaries of the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This amount includes 1,792.941062 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,397 units, which represent interests in the Company's stock fund."}],"balance_after":63953.3389,"source":{"system":"sec-edgar","filing":"0001209191-18-012705","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919118012705/doc4.xml","form_type":"4"}},{"id":4041446,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2018-02-22T23:49:37.000Z","date":"2018-02-20","kind":"disposition_to_issuer","acquired":false,"shares":4936.064,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Forfeiture of restricted shares, including accumulated dividends, granted under the 2015 Long-Term Shareholder Value Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This amount includes 1,792.941062 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,397 units, which represent interests in the Company's stock fund."}],"balance_after":54977.3389,"source":{"system":"sec-edgar","filing":"0001209191-18-012705","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919118012705/doc4.xml","form_type":"4"}},{"id":4091320,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value per share","published_at":"2018-01-24T21:30:49.000Z","date":"2018-01-22","kind":"disposition_to_issuer","acquired":false,"shares":6170.064,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Forfeiture of restricted shares, including accumulated dividends, granted under the 2015 Performance/Restricted Stock Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This amount includes 1,638.8996 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,378 units, which represent interests in the Company's stock fund."}],"balance_after":59759.3614,"source":{"system":"sec-edgar","filing":"0001209191-18-005126","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919118005126/doc4.xml","form_type":"4"}},{"id":4422484,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value","published_at":"2017-02-28T00:17:12.000Z","date":"2017-02-27","kind":"tax_withholding","acquired":false,"shares":2427,"price":19.65,"value":47690.55,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares withheld for payment of taxes on restricted stock units awarded on February 27, 2016.  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Ms. Powers holds approximately 1,222 units, which represent interests in the Company's stock fund."}],"balance_after":65749.8438,"source":{"system":"sec-edgar","filing":"0001209191-17-014992","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919117014992/doc4.xml","form_type":"4"}},{"id":4422483,"issuer":{"id":944,"kind":"organization","name":"ATI INC","symbol":"ATI"},"owners":[{"id":129758,"kind":"person","name":"Powers Elizabeth C","position":1,"cik":"0001332656","reported_name":"Powers Elizabeth C","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior VP, CHRO"}}],"security":"Common Stock, $0.10 par value","published_at":"2017-02-28T00:17:12.000Z","date":"2017-02-23","kind":"grant","acquired":true,"shares":12346,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Award of restricted stock units, which are settled in shares of stock upon vesting.  The award vests in three equal annual installments on each of the first three anniversaries of the grant date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"This amount includes 1,459.3180 shares of common stock that Ms. Powers owns in the Company's 401(k) Plan. Fluctuations in 401(k) share amounts reflect the Plan's unit reporting method. Ms. Powers holds approximately 1,222 units, which represent interests in the Company's stock fund."}],"balance_after":68176.8438,"source":{"system":"sec-edgar","filing":"0001209191-17-014992","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018963/000120919117014992/doc4.xml","form_type":"4"}}]}