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The reporting person undertakes 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."}],"balance_after":21291,"source":{"system":"sec-edgar","filing":"0001227285-20-000001","document":"wf-form4_157990240481354.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000122728520000001/wf-form4_157990240481354.xml","form_type":"4"}},{"id":3363600,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-11-21T22:14:09.000Z","date":"2019-11-20","kind":"sale","acquired":false,"shares":4044,"price":108.085,"value":437095.74,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on April 29, 2019 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the sale of 4,044 shares in multiple transactions, ranging from $106.7700 to $108.9500 per share, resulting in a weighted average sale price of $108.0848 per share. The reporting person undertakes 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."}],"balance_after":33791,"source":{"system":"sec-edgar","filing":"0001227285-19-000004","document":"wf-form4_157437443287999.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000122728519000004/wf-form4_157437443287999.xml","form_type":"4"}},{"id":3363599,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-11-21T22:14:09.000Z","date":"2019-11-19","kind":"sale","acquired":false,"shares":8456,"price":109.204,"value":923429.024,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on April 29, 2019 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 8,456 shares in multiple transactions, ranging from $108.2900 to $110.2800 per share, resulting in a weighted average sale price of $109.2040 per share. The reporting person undertakes 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."}],"balance_after":37835,"source":{"system":"sec-edgar","filing":"0001227285-19-000004","document":"wf-form4_157437443287999.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000122728519000004/wf-form4_157437443287999.xml","form_type":"4"}},{"id":3409373,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-09-20T22:17:22.000Z","date":"2019-09-19","kind":"sale","acquired":false,"shares":12500,"price":99.1554,"value":1239442.5,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on April 29, 2019 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 12,500 shares in multiple transactions, ranging from $97.61 to $100.24 per share, resulting in a weighted average sale price of $99.1554 per share. The reporting person undertakes 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."}],"balance_after":46291,"source":{"system":"sec-edgar","filing":"0001227285-19-000003","document":"wf-form4_156901782530299.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000122728519000003/wf-form4_156901782530299.xml","form_type":"4"}},{"id":3451432,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-08-01T21:33:20.000Z","date":"2019-07-31","kind":"sale","acquired":false,"shares":1280,"price":96.3712,"value":123355.136,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on April 29, 2019 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the sale of 1,280 shares in multiple transactions, ranging from $96.23 to $96.39 per share, resulting in a weighted average sale price of $96.3712 per share. The reporting person undertakes 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."}],"balance_after":58791,"source":{"system":"sec-edgar","filing":"0001227285-19-000002","document":"wf-form4_156469518355005.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000122728519000002/wf-form4_156469518355005.xml","form_type":"4"}},{"id":3451431,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-08-01T21:33:20.000Z","date":"2019-07-30","kind":"sale","acquired":false,"shares":11220,"price":95.9156,"value":1076173.032,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on April 29, 2019 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 11,220 shares in multiple transactions, ranging from $95.46 to $96.71 per share, resulting in a weighted average sale price of $95.9156 per share. The reporting person undertakes 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."}],"balance_after":60071,"source":{"system":"sec-edgar","filing":"0001227285-19-000002","document":"wf-form4_156469518355005.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000122728519000002/wf-form4_156469518355005.xml","form_type":"4"}},{"id":3607141,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-03-07T22:44:23.000Z","date":"2019-03-05","kind":"tax_withholding","acquired":false,"shares":5370,"price":108.79,"value":584202.3,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2019 of certain restricted stock units granted to the reporting person in 2016 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Includes 27,282 shares acquired pursuant to grants of restricted stock units."}],"balance_after":45832,"source":{"system":"sec-edgar","filing":"0001628280-19-002656","document":"wf-form4_155199864869355.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019002656/wf-form4_155199864869355.xml","form_type":"4"}},{"id":3607140,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-03-07T22:44:23.000Z","date":"2019-03-05","kind":"tax_withholding","acquired":false,"shares":10182,"price":108.79,"value":1107699.78,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2019 of the above-referenced performance shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 38,112 shares acquired pursuant to grants of restricted stock units."}],"balance_after":51202,"source":{"system":"sec-edgar","filing":"0001628280-19-002656","document":"wf-form4_155199864869355.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019002656/wf-form4_155199864869355.xml","form_type":"4"}},{"id":3607139,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-03-07T22:44:23.000Z","date":"2019-03-05","kind":"grant","acquired":true,"shares":23272,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares earned upon the vesting on March 5, 2019 of certain performance shares granted to the reporting person in 2016 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended.  On March 5, 2019, 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 2016 through 2018."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Shares earned upon the vesting on March 5, 2019 of certain performance shares granted to the reporting person in 2016 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended.  On March 5, 2019, 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 2016 through 2018."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 38,112 shares acquired pursuant to grants of restricted stock units."}],"balance_after":61384,"source":{"system":"sec-edgar","filing":"0001628280-19-002656","document":"wf-form4_155199864869355.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019002656/wf-form4_155199864869355.xml","form_type":"4"}},{"id":3607138,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-03-07T22:44:23.000Z","date":"2019-03-05","kind":"grant","acquired":true,"shares":8488,"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, 2019 of restricted stock units under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan. All restrictions will lapse on March 5, 2022 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, 2019 of restricted stock units under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan. All restrictions will lapse on March 5, 2022 or earlier upon the occurrence of certain specified circumstances."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 38,112 shares acquired pursuant to grants of restricted stock units."}],"balance_after":38112,"source":{"system":"sec-edgar","filing":"0001628280-19-002656","document":"wf-form4_155199864869355.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019002656/wf-form4_155199864869355.xml","form_type":"4"}},{"id":3687476,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-01-25T23:35:17.000Z","date":"2018-05-25","kind":"sale","acquired":false,"shares":9000,"price":108.6431,"value":977787.9,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on May 2, 2018 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 9,000 shares in multiple transactions, ranging from $108.0000 to $109.1300 per share, resulting in a weighted average sale price of $108.6431 per share. The reporting person undertakes 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."}],"balance_after":70741,"source":{"system":"sec-edgar","filing":"0001628280-19-000567","document":"wf-form4a_154845929762479.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019000567/wf-form4a_154845929762479.xml","form_type":"4/A","original_submission_date":"2018-05-29"}},{"id":3692247,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-01-18T23:23:57.000Z","date":"2019-01-18","kind":"sale","acquired":false,"shares":1100,"price":100.3618,"value":110397.98,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on May 2, 2018 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the sale of 1,100 shares in multiple transactions, ranging from $100.0000 to $100.8000 per share, resulting in a weighted average sale price of $100.3618 per share. The reporting person undertakes 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."}],"balance_after":61741,"source":{"system":"sec-edgar","filing":"0001628280-19-000426","document":"wf-form4_154785382073109.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019000426/wf-form4_154785382073109.xml","form_type":"4"}},{"id":3692246,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-01-18T23:23:57.000Z","date":"2019-01-17","kind":"sale","acquired":false,"shares":400,"price":100.0227,"value":40009.08,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on May 2, 2018 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 400 shares in multiple transactions, ranging from $100.0000 to $100.1300 per share, resulting in a weighted average sale price of $100.0227 per share. The reporting person undertakes 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."}],"balance_after":62841,"source":{"system":"sec-edgar","filing":"0001628280-19-000426","document":"wf-form4_154785382073109.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019000426/wf-form4_154785382073109.xml","form_type":"4"}},{"id":3697866,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2019-01-12T00:49:14.000Z","date":"2019-01-10","kind":"sale","acquired":false,"shares":4500,"price":94.8162,"value":426672.9,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on May 2, 2018 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 4,500 shares in multiple transactions, ranging from $94.1400 to $95.1900 per share, resulting in a weighted average sale price of $94.8162 per share. The reporting person undertakes 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."}],"balance_after":63241,"source":{"system":"sec-edgar","filing":"0001628280-19-000290","document":"wf-form4_154725413707932.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828019000290/wf-form4_154725413707932.xml","form_type":"4"}},{"id":3777491,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2018-11-02T23:47:52.000Z","date":"2018-11-02","kind":"sale","acquired":false,"shares":1500,"price":100.414,"value":150621.0,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on May 2, 2018 as part of the reporting person's financial planning to diversify his stockholdings. The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the sale of 1,500 shares in multiple transactions, ranging from $100.00 to $100.83 per share, resulting in a weighted average sale price of $100.414 per share. 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The plan contemplates the sale of a pre-determined amount of vested shares of common stock of the Registrant held by the reporting person in specified increments subject to designated floor prices."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"Represents the sale of 9,000 shares in multiple transactions, ranging from $103.2100 to $105.0800 per share, resulting in a weighted average sale price of $104.0143 per share. The reporting person undertakes 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."}],"balance_after":52613,"source":{"system":"sec-edgar","filing":"0001628280-18-002892","document":"wf-form4_152046587210666.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828018002892/wf-form4_152046587210666.xml","form_type":"4"}},{"id":4009309,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2018-03-07T23:38:06.000Z","date":"2018-03-05","kind":"tax_withholding","acquired":false,"shares":5477,"price":101.66,"value":556791.82,"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, 2018 of certain shares granted to the reporting person in 2015 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 29,624 shares acquired pursuant to grants of restricted stock units."}],"balance_after":56752,"source":{"system":"sec-edgar","filing":"0001628280-18-002892","document":"wf-form4_152046587210666.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828018002892/wf-form4_152046587210666.xml","form_type":"4"}},{"id":4009308,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2018-03-07T23:38:06.000Z","date":"2018-03-05","kind":"tax_withholding","acquired":false,"shares":18321,"price":101.66,"value":1862512.86,"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, 2018 of the above-referenced performance shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 29,624 shares acquired pursuant to grants of restricted stock units."}],"balance_after":62229,"source":{"system":"sec-edgar","filing":"0001628280-18-002892","document":"wf-form4_152046587210666.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828018002892/wf-form4_152046587210666.xml","form_type":"4"}},{"id":4009307,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2018-03-07T23:38:06.000Z","date":"2018-03-05","kind":"grant","acquired":true,"shares":39880,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares earned upon the vesting on March 5, 2018 of certain performance shares granted to the reporting person in 2015 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended.  On March 5, 2018, 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 2015 through 2017."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Shares earned upon the vesting on March 5, 2018 of certain performance shares granted to the reporting person in 2015 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended.  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The reporting person undertakes 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."}],"balance_after":61613,"source":{"system":"sec-edgar","filing":"0001628280-18-001705","document":"wf-form5_151864901549409.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828018001705/wf-form5_151864901549409.xml","form_type":"5"}},{"id":4061009,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2018-02-14T22:58:04.000Z","date":"2017-07-27","kind":"gift","acquired":false,"shares":300,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Bona fide gift by the reporting person for no consideration."}],"balance_after":61613,"source":{"system":"sec-edgar","filing":"0001628280-18-001705","document":"wf-form5_151864901549409.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000162828018001705/wf-form5_151864901549409.xml","form_type":"5"}},{"id":4199549,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":89984,"kind":"person","name":"HOCKEMA JACK A","position":1,"cik":"0001227285","reported_name":"HOCKEMA JACK A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2017-09-29T23:31:39.000Z","date":"2017-09-29","kind":"sale","acquired":false,"shares":3018,"price":102.6957,"value":309935.6226,"ownership":{"direct":false,"nature":"By Hockema Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Sales made pursuant to a 10b5-1 plan adopted by the reporting person on May 10, 2017 as part of the reporting person's financial planning to diversify his stockholdings. 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