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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_71D1599002EF682BA8FED1D3D5683BA0_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_71D1599002EF682BA8FED1D3D5683BA0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
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    <link:label id="lab_us-gaap_InterestPaid_4552191CA2E65AAF26C9D1D3D568DC22_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaid_4552191CA2E65AAF26C9D1D3D568DC22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest paid</link:label>
    <link:label id="lab_us-gaap_InterestPaid_4552191CA2E65AAF26C9D1D3D568DC22_label_en-US" xlink:label="lab_us-gaap_InterestPaid_4552191CA2E65AAF26C9D1D3D568DC22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_2C41F9CC036D0CBBCB4CD1D3D5689EEE_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_2C41F9CC036D0CBBCB4CD1D3D5689EEE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Non-cash investing and financing activities (included in Accounts payable):</link:label>
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    <link:label id="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_DD6215B139BE30396301D1D3D568BBD7_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_DD6215B139BE30396301D1D3D568BBD7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unpaid purchases of property and equipment</link:label>
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    <link:label id="lab_us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1_442744490D6486DFDE69D1D3D56882C3_terseLabel_en-US" xlink:label="lab_us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1_442744490D6486DFDE69D1D3D56882C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock repurchases not yet settled</link:label>
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    <link:label id="lab_us-gaap_CapitalLeaseObligationsIncurred_2C7F68173783430E1F77D1D3D5685B6C_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsIncurred_2C7F68173783430E1F77D1D3D5685B6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Acquisition of property and equipment through capital leasing arrangements</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetFairValueGrossLiability_1F8A379F23848DB78D22D1CA81F4E658_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueGrossLiability_1F8A379F23848DB78D22D1CA81F4E658" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net derivative liability</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetFairValueGrossLiability_1F8A379F23848DB78D22D1CA81F4E658_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueGrossLiability_1F8A379F23848DB78D22D1CA81F4E658" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Gross Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_1F8A379F23848DB78D22D1CA81F4E658" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_E2E4C0994982DBC61579D1CA81F40C0B_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_E2E4C0994982DBC61579D1CA81F40C0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_E2E4C0994982DBC61579D1CA81F40C0B_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_E2E4C0994982DBC61579D1CA81F40C0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_E2E4C0994982DBC61579D1CA81F40C0B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AvailableForSaleSecurities_87329E2648DC9EC3F1CED1CA81F40153_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecurities_87329E2648DC9EC3F1CED1CA81F40153" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Short-term investments</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecurities_87329E2648DC9EC3F1CED1CA81F40153_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecurities_87329E2648DC9EC3F1CED1CA81F40153" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsFairValueDisclosure_303B63E83D512EC49744D1CA81F59427_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsFairValueDisclosure_303B63E83D512EC49744D1CA81F59427" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_OtherAssetsFairValueDisclosure_303B63E83D512EC49744D1CA81F59427_label_en-US" xlink:label="lab_us-gaap_OtherAssetsFairValueDisclosure_303B63E83D512EC49744D1CA81F59427" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Fair Value Disclosure</link:label>
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    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_9C3C5C81A855BDDC144DCCD86EC23D17_verboseLabel_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_9C3C5C81A855BDDC144DCCD86EC23D17" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">CONDENSED CONSOLIDATING BALANCE SHEETS</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_9C3C5C81A855BDDC144DCCD86EC23D17" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ReceivablesAbstract_BE70065729FDEB818534CCD86EC39D3D_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivablesAbstract_BE70065729FDEB818534CCD86EC39D3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables:</link:label>
    <link:label id="lab_us-gaap_ReceivablesAbstract_BE70065729FDEB818534CCD86EC39D3D_label_en-US" xlink:label="lab_us-gaap_ReceivablesAbstract_BE70065729FDEB818534CCD86EC39D3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReceivablesAbstract" xlink:label="loc_us-gaap_ReceivablesAbstract_BE70065729FDEB818534CCD86EC39D3D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_3E32137523657A120BECCCD86EC4C377_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_3E32137523657A120BECCCD86EC4C377" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_3E32137523657A120BECCCD86EC4C377" xlink:type="locator" />
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    <link:label id="lab_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7_terseLabel_en-US" xlink:label="lab_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intercompany receivables</link:label>
    <link:label id="lab_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7_label_en-US" xlink:label="lab_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intercompany Receivables, Current</link:label>
    <link:label id="lab_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7_documentation_en-US" xlink:label="lab_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Intercompany Receivables, Current</link:label>
    <link:loc xlink:href="kalu-20180630.xsd#kalu_IntercompanyReceivablesCurrent" xlink:label="loc_kalu_IntercompanyReceivablesCurrent_A435AA7ECB598500DF4ECCD86EC483A7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_8EF41BD3D302F168D492CCD86EC55A76_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_8EF41BD3D302F168D492CCD86EC55A76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
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    <link:label id="lab_us-gaap_AssetsCurrent_F356C85209F11DD2ECFACCD86EC54BEB_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_F356C85209F11DD2ECFACCD86EC54BEB" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_F356C85209F11DD2ECFACCD86EC54BEB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue_88E7291A8A32E8119B81CCD86EC5F68F_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue_88E7291A8A32E8119B81CCD86EC5F68F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments in and advances to subsidiaries</link:label>
    <link:label id="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue_88E7291A8A32E8119B81CCD86EC5F68F_label_en-US" xlink:label="lab_us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue_88E7291A8A32E8119B81CCD86EC5F68F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments in and Advances to Affiliates, at Fair Value</link:label>
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    <link:label id="lab_kalu_IntercompanyReceivablesNoncurrent_F2DFC57AD5F99517F4ADCCD86EC51F97_terseLabel_en-US" xlink:label="lab_kalu_IntercompanyReceivablesNoncurrent_F2DFC57AD5F99517F4ADCCD86EC51F97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term intercompany loans receivable</link:label>
    <link:label id="lab_kalu_IntercompanyReceivablesNoncurrent_F2DFC57AD5F99517F4ADCCD86EC51F97_label_en-US" xlink:label="lab_kalu_IntercompanyReceivablesNoncurrent_F2DFC57AD5F99517F4ADCCD86EC51F97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intercompany Receivables, Noncurrent</link:label>
    <link:label id="lab_kalu_IntercompanyReceivablesNoncurrent_F2DFC57AD5F99517F4ADCCD86EC51F97_documentation_en-US" xlink:label="lab_kalu_IntercompanyReceivablesNoncurrent_F2DFC57AD5F99517F4ADCCD86EC51F97" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Intercompany Receivables, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxAssetsNetNoncurrent_8D9A32B47F4C73E86F0DCCD86EC5A326_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetNoncurrent_8D9A32B47F4C73E86F0DCCD86EC5A326" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax assets, net</link:label>
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    <link:label id="lab_kalu_IntercompanyPayableCurrent_6D8D58A047DFAA9E3D58CCD86EC74CB8_terseLabel_en-US" xlink:label="lab_kalu_IntercompanyPayableCurrent_6D8D58A047DFAA9E3D58CCD86EC74CB8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intercompany loans payable</link:label>
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