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On March 5, 2022, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of certain pre-established performance goals for 2019 through 2021."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Shares earned upon the vesting on March 5, 2022 of certain performance shares granted to the reporting person in 2019 under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan.  On March 5, 2022, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of certain pre-established performance goals for 2019 through 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 30,289 shares acquired pursuant to grants of restricted stock units."}],"balance_after":32658,"source":{"system":"sec-edgar","filing":"0001628280-22-005413","document":"wf-form4_164677898323406.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828022005413/wf-form4_164677898323406.xml","form_type":"4"}},{"id":2346021,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":73421,"kind":"person","name":"Tiffany Blain","position":1,"cik":"0001323719","reported_name":"Tiffany Blain","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP - Sales & Marketing"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2022-03-08T22:36:44.000Z","date":"2022-03-05","kind":"grant","acquired":true,"shares":1462,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Grant to the reporting person effective as of March 5, 2022 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. All restrictions will lapse on March 5, 2025 or earlier upon the occurrence of certain specified circumstances."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Grant to the reporting person effective as of March 5, 2022 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. All restrictions will lapse on March 5, 2025 or earlier upon the occurrence of certain specified circumstances."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 30,289 shares acquired pursuant to grants of restricted stock units."}],"balance_after":32238,"source":{"system":"sec-edgar","filing":"0001628280-22-005413","document":"wf-form4_164677898323406.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828022005413/wf-form4_164677898323406.xml","form_type":"4"}}]}