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The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 10,062 shares acquired pursuant to grants of restricted stock units."}],"balance_after":49567,"source":{"system":"sec-edgar","filing":"0001551869-17-000002","document":"wf-form4_149367064018756.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000155186917000002/wf-form4_149367064018756.xml","form_type":"4"}},{"id":4398996,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":50429,"kind":"person","name":"Harvey Keith","position":1,"cik":"0001551869","reported_name":"Harvey Keith","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-07T23:45:16.000Z","date":"2017-03-05","kind":"tax_withholding","acquired":false,"shares":1591,"price":79.69,"value":126786.79,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2017 of certain shares granted to the reporting person in 2014 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 10,062 shares acquired pursuant to grants of restricted stock units."}],"balance_after":52067,"source":{"system":"sec-edgar","filing":"0001628280-17-002327","document":"wf-form4_148893030303684.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828017002327/wf-form4_148893030303684.xml","form_type":"4"}},{"id":4398995,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":50429,"kind":"person","name":"Harvey Keith","position":1,"cik":"0001551869","reported_name":"Harvey Keith","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-07T23:45:16.000Z","date":"2017-03-05","kind":"tax_withholding","acquired":false,"shares":2398,"price":79.69,"value":191096.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2017 of the above-referenced performance shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 10,062 shares acquired pursuant to grants of restricted stock units."}],"balance_after":53658,"source":{"system":"sec-edgar","filing":"0001628280-17-002327","document":"wf-form4_148893030303684.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828017002327/wf-form4_148893030303684.xml","form_type":"4"}},{"id":4398994,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":50429,"kind":"person","name":"Harvey Keith","position":1,"cik":"0001551869","reported_name":"Harvey Keith","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-07T23:45:16.000Z","date":"2017-03-05","kind":"grant","acquired":true,"shares":6366,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares earned upon the vesting on March 5, 2017 of certain performance shares granted to the reporting person in 2014 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended.  On March 5, 2017, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of a certain pre-established performance goal for 2014 through 2016."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Shares earned upon the vesting on March 5, 2017 of certain performance shares granted to the reporting person in 2014 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended.  On March 5, 2017, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of a certain pre-established performance goal for 2014 through 2016."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 10,062 shares acquired pursuant to grants of restricted stock units."}],"balance_after":56056,"source":{"system":"sec-edgar","filing":"0001628280-17-002327","document":"wf-form4_148893030303684.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828017002327/wf-form4_148893030303684.xml","form_type":"4"}},{"id":4398993,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":50429,"kind":"person","name":"Harvey Keith","position":1,"cik":"0001551869","reported_name":"Harvey Keith","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & COO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-03-07T23:45:16.000Z","date":"2017-03-05","kind":"grant","acquired":true,"shares":4955,"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, 2017 of restricted stock units under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan. 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