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Guarantor and Non-Guarantor Financial Statements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 23, 2012
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 177.7 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | $ 169.5 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | $ 177.7 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 169.5 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 273.4 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  | $ 49.8 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Short-term investments | 114.0 us-gaap_AvailableForSaleSecuritiesCurrent |  |  |  | 129.5 us-gaap_AvailableForSaleSecuritiesCurrent |  |  |  | 114.0 us-gaap_AvailableForSaleSecuritiesCurrent |  | 129.5 us-gaap_AvailableForSaleSecuritiesCurrent |  |  |  |  |  |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 129.3 us-gaap_AccountsReceivableNetCurrent |  |  |  | 119.8 us-gaap_AccountsReceivableNetCurrent |  |  |  | 129.3 us-gaap_AccountsReceivableNetCurrent |  | 119.8 us-gaap_AccountsReceivableNetCurrent |  |  |  |  |  |
Intercompany receivables | 0 kalu_IntercompanyReceivablesCurrent |  |  |  | 0 kalu_IntercompanyReceivablesCurrent |  |  |  | 0 kalu_IntercompanyReceivablesCurrent |  | 0 kalu_IntercompanyReceivablesCurrent |  |  |  |  |  |
Other | 10.9 us-gaap_OtherReceivables |  |  |  | 13.4 us-gaap_OtherReceivables |  |  |  | 10.9 us-gaap_OtherReceivables |  | 13.4 us-gaap_OtherReceivables |  |  |  |  |  |
Inventories | 214.7 us-gaap_InventoryNet |  |  |  | 214.4 us-gaap_InventoryNet |  |  |  | 214.7 us-gaap_InventoryNet |  | 214.4 us-gaap_InventoryNet |  |  |  |  |  |
Prepaid expenses and other current assets | 178.6 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  |  | 44.2 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  |  | 178.6 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 44.2 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  |  |  |  |
Total current assets | 825.2 us-gaap_AssetsCurrent |  |  |  | 690.8 us-gaap_AssetsCurrent |  |  |  | 825.2 us-gaap_AssetsCurrent |  | 690.8 us-gaap_AssetsCurrent |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue |  |  |  | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue |  |  |  | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue |  | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue |  |  |  |  |  |
Property, plant and equipment — net | 454.9 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 429.3 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 454.9 us-gaap_PropertyPlantAndEquipmentNet |  | 429.3 us-gaap_PropertyPlantAndEquipmentNet |  |  |  |  |  |
Long-term intercompany receivables | 0 kalu_IntercompanyReceivablesNoncurrent |  |  |  | 0 kalu_IntercompanyReceivablesNoncurrent |  |  |  | 0 kalu_IntercompanyReceivablesNoncurrent |  | 0 kalu_IntercompanyReceivablesNoncurrent |  |  |  |  |  |
Net asset of VEBAs | 340.1 kalu_NetAssetInRespectOfVebas |  |  |  | 406.0 kalu_NetAssetInRespectOfVebas |  |  |  | 340.1 kalu_NetAssetInRespectOfVebas |  | 406.0 kalu_NetAssetInRespectOfVebas |  |  |  |  |  |
Deferred tax assets — net | 30.9 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  |  | 69.1 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  |  | 30.9 us-gaap_DeferredTaxAssetsNetNoncurrent |  | 69.1 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  |  |  |  |
Intangible assets — net | 32.1 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  | 33.7 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  | 32.1 us-gaap_FiniteLivedIntangibleAssetsNet |  | 33.7 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  |  |  |
Goodwill | 37.2 us-gaap_Goodwill |  |  |  | 37.2 us-gaap_Goodwill |  |  |  | 37.2 us-gaap_Goodwill |  | 37.2 us-gaap_Goodwill |  |  |  |  |  |
Other assets | 23.3 us-gaap_OtherAssetsNoncurrent |  |  |  | 104.8 us-gaap_OtherAssetsNoncurrent |  |  |  | 23.3 us-gaap_OtherAssetsNoncurrent |  | 104.8 us-gaap_OtherAssetsNoncurrent |  |  |  |  |  |
Total | 1,743.7 us-gaap_Assets |  |  |  | 1,770.9 us-gaap_Assets |  |  |  | 1,743.7 us-gaap_Assets |  | 1,770.9 us-gaap_Assets |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 81.4 us-gaap_AccountsPayableCurrent |  |  |  | 62.9 us-gaap_AccountsPayableCurrent |  |  |  | 81.4 us-gaap_AccountsPayableCurrent |  | 62.9 us-gaap_AccountsPayableCurrent |  |  |  |  |  |
Intercompany payable | 0 kalu_IntercompanyPayableCurrent |  |  |  | 0 kalu_IntercompanyPayableCurrent |  |  |  | 0 kalu_IntercompanyPayableCurrent |  | 0 kalu_IntercompanyPayableCurrent |  |  |  |  |  |
Accrued salaries, wages and related expenses | 39.6 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |  |  | 42.7 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |  |  | 39.6 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | 42.7 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |  |  |  |  |
Other accrued liabilities | 132.8 us-gaap_OtherAccruedLiabilitiesCurrent |  |  |  | 44.8 us-gaap_OtherAccruedLiabilitiesCurrent |  |  |  | 132.8 us-gaap_OtherAccruedLiabilitiesCurrent |  | 44.8 us-gaap_OtherAccruedLiabilitiesCurrent |  |  |  |  |  |
Current portion of long-term debt | 172.5 us-gaap_SecuredDebtCurrent |  |  |  | 0 us-gaap_SecuredDebtCurrent |  |  |  | 172.5 us-gaap_SecuredDebtCurrent |  | 0 us-gaap_SecuredDebtCurrent |  |  |  |  |  |
Short-term capital leases | 0.1 us-gaap_CapitalLeaseObligationsCurrent |  |  |  | 0.2 us-gaap_CapitalLeaseObligationsCurrent |  |  |  | 0.1 us-gaap_CapitalLeaseObligationsCurrent |  | 0.2 us-gaap_CapitalLeaseObligationsCurrent |  |  |  |  |  |
Total current liabilities | 426.4 us-gaap_LiabilitiesCurrent |  |  |  | 150.6 us-gaap_LiabilitiesCurrent |  |  |  | 426.4 us-gaap_LiabilitiesCurrent |  | 150.6 us-gaap_LiabilitiesCurrent |  |  |  |  |  |
Net liability of VEBA | 17.2 kalu_NetLiabilityInRespectOfVeba |  |  |  | 0 kalu_NetLiabilityInRespectOfVeba |  |  |  | 17.2 kalu_NetLiabilityInRespectOfVeba |  | 0 kalu_NetLiabilityInRespectOfVeba |  |  |  |  |  |
Deferred tax liabilities | 0.9 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  |  |  | 1.2 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  |  |  | 0.9 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  | 1.2 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  |  |  |  |  |
Long-term intercompany payable | 0 kalu_IntercompanyPayableNoncurrent |  |  |  | 0 kalu_IntercompanyPayableNoncurrent |  |  |  | 0 kalu_IntercompanyPayableNoncurrent |  | 0 kalu_IntercompanyPayableNoncurrent |  |  |  |  |  |
Long-term liabilities | 58.3 us-gaap_OtherLiabilitiesNoncurrent |  |  |  | 146.4 us-gaap_OtherLiabilitiesNoncurrent |  |  |  | 58.3 us-gaap_OtherLiabilitiesNoncurrent |  | 146.4 us-gaap_OtherLiabilitiesNoncurrent |  |  |  |  |  |
Long-term debt | 225.0 us-gaap_LongTermDebtNoncurrent |  |  |  | 388.5 us-gaap_LongTermDebtNoncurrent |  |  |  | 225.0 us-gaap_LongTermDebtNoncurrent |  | 388.5 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |
Total liabilities | 727.8 us-gaap_Liabilities |  |  |  | 686.7 us-gaap_Liabilities |  |  |  | 727.8 us-gaap_Liabilities |  | 686.7 us-gaap_Liabilities |  |  |  |  |  |
Total stockholders’ equity | 1,015.9 us-gaap_StockholdersEquity |  |  |  | 1,084.2 us-gaap_StockholdersEquity |  |  |  | 1,015.9 us-gaap_StockholdersEquity |  | 1,084.2 us-gaap_StockholdersEquity |  | 1,070.8 us-gaap_StockholdersEquity |  | 872.8 us-gaap_StockholdersEquity |  |
Total | 1,743.7 us-gaap_LiabilitiesAndStockholdersEquity |  |  |  | 1,770.9 us-gaap_LiabilitiesAndStockholdersEquity |  |  |  | 1,743.7 us-gaap_LiabilitiesAndStockholdersEquity |  | 1,770.9 us-gaap_LiabilitiesAndStockholdersEquity |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 338.0 us-gaap_SalesRevenueGoodsNet | 338.9 us-gaap_SalesRevenueGoodsNet | 344.1 us-gaap_SalesRevenueGoodsNet | 335.1 us-gaap_SalesRevenueGoodsNet | 311.3 us-gaap_SalesRevenueGoodsNet | 319.9 us-gaap_SalesRevenueGoodsNet | 328.9 us-gaap_SalesRevenueGoodsNet | 337.4 us-gaap_SalesRevenueGoodsNet | 1,356.1 us-gaap_SalesRevenueGoodsNet |  | 1,297.5 us-gaap_SalesRevenueGoodsNet |  | 1,360.1 us-gaap_SalesRevenueGoodsNet |  |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items | 278.7 us-gaap_CostOfGoodsSold | 280.4 us-gaap_CostOfGoodsSold | 275.5 us-gaap_CostOfGoodsSold | 282.9 us-gaap_CostOfGoodsSold | 254.3 us-gaap_CostOfGoodsSold | 259.5 us-gaap_CostOfGoodsSold | 261.5 us-gaap_CostOfGoodsSold | 263.6 us-gaap_CostOfGoodsSold | 1,117.5 us-gaap_CostOfGoodsSold |  | 1,038.9 us-gaap_CostOfGoodsSold |  | 1,116.2 us-gaap_CostOfGoodsSold |  |  |  |
Unrealized losses (gains) on derivative instruments | 10.4 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | 3.6 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | (1.6)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | (2.0)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | (4.1)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | (1.5)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | 4.2 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | 0.7 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities | 10.4 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities |  | (0.7)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities |  | (15.2)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 31.1 us-gaap_DepreciationDepletionAndAmortization |  | 28.1 us-gaap_DepreciationDepletionAndAmortization |  | 26.5 us-gaap_DepreciationDepletionAndAmortization |  |  |  |
Selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 81.4 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses |  | 80.4 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses |  | 74.1 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses |  |  |  |
Non-cash defined benefit net periodic benefit income |  |  |  |  |  |  |  |  | (23.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | (22.0)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | (11.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  |  |  |
Defined benefit plan, net periodic benefit cost - VEBAs |  |  |  |  |  |  |  |  | (23.7)kalu_DefinedbenefitplannetperiodicbenefitcostVEBAs |  | (22.5)kalu_DefinedbenefitplannetperiodicbenefitcostVEBAs |  | (11.9)kalu_DefinedbenefitplannetperiodicbenefitcostVEBAs |  |  |  |
Total selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 57.7 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses |  | 57.9 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses |  | 62.2 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses |  |  |  |
Other operating charges, net |  |  |  |  |  |  |  |  | 1.5 us-gaap_OtherOperatingIncomeExpenseNet |  | 0 us-gaap_OtherOperatingIncomeExpenseNet |  | 4.5 us-gaap_OtherOperatingIncomeExpenseNet |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 1,218.2 us-gaap_CostsAndExpenses |  | 1,124.2 us-gaap_CostsAndExpenses |  | 1,194.2 us-gaap_CostsAndExpenses |  |  |  |
Operating (loss) income | 26.8 us-gaap_OperatingIncomeLoss | 32.6 us-gaap_OperatingIncomeLoss | 46.4 us-gaap_OperatingIncomeLoss | 32.1 us-gaap_OperatingIncomeLoss | 41.6 us-gaap_OperatingIncomeLoss | 41.6 us-gaap_OperatingIncomeLoss | 40.1 us-gaap_OperatingIncomeLoss | 50.0 us-gaap_OperatingIncomeLoss | 137.9 us-gaap_OperatingIncomeLoss |  | 173.3 us-gaap_OperatingIncomeLoss |  | 165.9 us-gaap_OperatingIncomeLoss |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (37.5)us-gaap_InterestIncomeExpenseNet |  | (35.7)us-gaap_InterestIncomeExpenseNet |  | (29.1)us-gaap_InterestIncomeExpenseNet |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 6.7 us-gaap_OtherNonoperatingIncomeExpense |  | 5.6 us-gaap_OtherNonoperatingIncomeExpense |  | 2.8 us-gaap_OtherNonoperatingIncomeExpense |  |  |  |
(Loss) income before income taxes |  |  |  |  |  |  |  |  | 107.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 143.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 139.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | (35.3)us-gaap_IncomeTaxExpenseBenefit |  | (38.4)us-gaap_IncomeTaxExpenseBenefit |  | (53.8)us-gaap_IncomeTaxExpenseBenefit |  |  |  |
Earnings in equity of subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |
Net income | 15.6 us-gaap_NetIncomeLoss | 15.9 us-gaap_NetIncomeLoss | 24.5 us-gaap_NetIncomeLoss | 15.8 us-gaap_NetIncomeLoss | 27.3 us-gaap_NetIncomeLoss | 25.4 us-gaap_NetIncomeLoss | 18.6 us-gaap_NetIncomeLoss | 33.5 us-gaap_NetIncomeLoss | 71.8 us-gaap_NetIncomeLoss |  | 104.8 us-gaap_NetIncomeLoss |  | 85.8 us-gaap_NetIncomeLoss |  |  |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (3.6)us-gaap_ComprehensiveIncomeNetOfTax |  | 110.1 us-gaap_ComprehensiveIncomeNetOfTax |  | 144.8 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 124.1 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 111.7 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 152.4 us-gaap_NetCashProvidedByUsedInOperatingActivities |  |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (59.4)us-gaap_PaymentsToAcquireProductiveAssets |  | (70.4)us-gaap_PaymentsToAcquireProductiveAssets |  | (44.1)us-gaap_PaymentsToAcquireProductiveAssets |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  |  |  |  |  | 93.5 us-gaap_PaymentsToAcquireAvailableForSaleSecurities |  | 227.8 us-gaap_PaymentsToAcquireAvailableForSaleSecurities |  | 85.0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities |  |  |  |
Proceeds from disposal of property, plant and equipment |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 0.3 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |  |
Proceeds from disposition of available for sale securities |  |  |  |  |  |  |  |  | 108.2 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  | 183.1 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities |  |  |  |
Change in restricted cash |  |  |  |  |  |  |  |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash |  | 1.7 us-gaap_IncreaseDecreaseInRestrictedCash |  | 6.9 us-gaap_IncreaseDecreaseInRestrictedCash |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (44.7)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (113.4)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (121.9)us-gaap_NetCashProvidedByUsedInInvestingActivities |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Senior Notes |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt | [1] | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt | [1] | 225.0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt | [1] |  |  |
Repayments of capital lease |  |  |  |  |  |  |  |  | (0.1)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations | [1] | (0.1)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations | [1] | (0.1)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations | [1] |  |  |
Repayment of promissory notes |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfNotesPayable | [1] | 0 us-gaap_RepaymentsOfNotesPayable | [1] | (4.7)us-gaap_RepaymentsOfNotesPayable | [1] |  |  |
Cash paid for financing costs |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfFinancingCosts | [1] | 0 us-gaap_PaymentsOfFinancingCosts | [1] | (6.6)us-gaap_PaymentsOfFinancingCosts | [1] |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (44.1)us-gaap_PaymentsForRepurchaseOfCommonStock | [1] | (78.3)us-gaap_PaymentsForRepurchaseOfCommonStock | [1] | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | [1] |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  |  |  |  |  |  |  |  | 0.8 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | [1] | 1.1 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | [1] | 1.3 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | [1] |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  |  |  |  |  |  |  |  | (2.4)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | [1] | (2.5)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | [1] | (2.2)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | [1] |  |  |
Cash dividend paid to stockholders |  |  |  |  |  |  |  |  | (25.4)us-gaap_PaymentsOfDividendsCommonStock | [1] | (23.0)us-gaap_PaymentsOfDividendsCommonStock | [1] | (19.6)us-gaap_PaymentsOfDividendsCommonStock | [1] |  |  |
Cash dividend returned to the Company |  |  | 0.6 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust |  |  |  |  |  | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | [1] | 0.6 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | [1] | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | [1] |  |  |
Intercompany loan |  |  |  |  |  |  |  |  | 0 kalu_RepaymentsOfProceedsFromIntercompanyloan |  | 0 kalu_RepaymentsOfProceedsFromIntercompanyloan |  | 0 kalu_RepaymentsOfProceedsFromIntercompanyloan |  |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (71.2)us-gaap_NetCashProvidedByUsedInFinancingActivities | [1] | (102.2)us-gaap_NetCashProvidedByUsedInFinancingActivities | [1] | 193.1 us-gaap_NetCashProvidedByUsedInFinancingActivities | [1] |  |  |
Net increase (decrease) in cash and cash equivalents during the period |  |  |  |  |  |  |  |  | 8.2 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | (103.9)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 223.6 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  | 169.5 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 273.4 us-gaap_CashAndCashEquivalentsAtCarryingValue | 169.5 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 273.4 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 49.8 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  | 49.8 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Cash and cash equivalents at end of period | 177.7 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 169.5 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 177.7 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 169.5 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 273.4 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  | 49.8 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Principal amount of notes | 225.0 us-gaap_DebtInstrumentFaceAmount |  |  |  | 225.0 us-gaap_DebtInstrumentFaceAmount |  |  |  | 225.0 us-gaap_DebtInstrumentFaceAmount |  | 225.0 us-gaap_DebtInstrumentFaceAmount |  |  |  |  |  |
Ownership interest by parent | 100.00%kalu_OwnershipInterestInSubsidiaries |  |  |  |  |  |  |  | 100.00%kalu_OwnershipInterestInSubsidiaries |  |  |  |  |  |  |  |
Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Short-term investments | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Intercompany receivables | 204.2 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 204.2 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Other | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Inventories | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Prepaid expenses and other current assets | 85.1 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0.1 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 85.1 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0.1 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Total current assets | 289.3 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 5.1 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 289.3 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5.1 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | 1,209.2 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,437.9 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,209.2 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,437.9 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Property, plant and equipment — net | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Long-term intercompany receivables | 0 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 31.3 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 31.3 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Net asset of VEBAs | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Deferred tax assets — net | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Intangible assets — net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Other assets | 4.4 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 86.2 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 4.4 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 86.2 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Total | 1,502.9 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,560.5 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,502.9 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,560.5 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 1.3 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1.1 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1.3 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1.1 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Intercompany payable | 0 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Accrued salaries, wages and related expenses | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Other accrued liabilities | 88.2 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 3.5 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 88.2 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3.5 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Current portion of long-term debt | 172.5 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 172.5 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |
Short-term capital leases | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Total current liabilities | 262.0 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 4.6 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 262.0 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 4.6 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Net liability of VEBA | 0 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 0 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |
Deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Long-term intercompany payable | 0 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Long-term liabilities | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 83.2 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 83.2 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Long-term debt | 225.0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 388.5 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 225.0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 388.5 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Total liabilities | 487.0 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 476.3 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 487.0 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 476.3 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Total stockholders’ equity | 1,015.9 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,084.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,015.9 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,084.2 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Total | 1,502.9 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,560.5 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 1,502.9 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,560.5 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Unrealized losses (gains) on derivative instruments |  |  |  |  |  |  |  |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 4.1 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3.8 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2.0 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Non-cash defined benefit net periodic benefit income |  |  |  |  |  |  |  |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 4.1 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3.8 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2.0 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Other operating charges, net |  |  |  |  |  |  |  |  | 0 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 4.1 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3.8 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2.0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | (4.1)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (3.8)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (2.0)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (37.5)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (36.6)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (28.2)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 3.7 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3.9 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0.8 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
(Loss) income before income taxes |  |  |  |  |  |  |  |  | (37.9)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (36.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (29.4)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Earnings in equity of subsidiaries |  |  |  |  |  |  |  |  | 109.7 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 141.3 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 115.2 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Net income |  |  |  |  |  |  |  |  | 71.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 104.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 85.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (3.6)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 110.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 144.8 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 35.6 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (29.2)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (17.8)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Proceeds from disposal of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Proceeds from disposition of available for sale securities |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Change in restricted cash |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 6.9 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 6.9 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | 225.0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Repayments of capital lease |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Repayment of promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash paid for financing costs |  |  |  |  |  |  |  |  |  |  |  |  | (6.6)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (44.1)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (78.3)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  |  |  |  |  |  |  |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  |  |  |  |  |  |  |  | (2.4)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (2.5)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (2.2)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash dividend paid to stockholders |  |  |  |  |  |  |  |  | (25.4)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (23.0)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (19.6)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash dividend returned to the Company |  |  |  |  |  |  |  |  |  |  | 0.6 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |
Intercompany loan |  |  |  |  |  |  |  |  | 31.3 kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 132.4 kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (185.7)kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (40.6)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 29.2 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 10.9 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Net increase (decrease) in cash and cash equivalents during the period |  |  |  |  |  |  |  |  | (5.0)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash and cash equivalents at end of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  | 5.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 175.3 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 157.7 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 175.3 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 157.7 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 266.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  | 43.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Short-term investments | 114.0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 129.5 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 114.0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 129.5 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 126.1 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 117.7 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 126.1 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 117.7 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Intercompany receivables | 4.0 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0.1 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 4.0 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0.1 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Other | 5.6 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 5.3 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 5.6 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 5.3 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Inventories | 208.0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 208.6 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 208.0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 208.6 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Prepaid expenses and other current assets | 93.1 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 43.7 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 93.1 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 43.7 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Total current assets | 726.1 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 662.6 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 726.1 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 662.6 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | 32.5 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 26.5 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 32.5 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 26.5 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Property, plant and equipment — net | 437.4 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 414.0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 437.4 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 414.0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Long-term intercompany receivables | 0 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1.6 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1.6 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Net asset of VEBAs | 340.1 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 406.0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 340.1 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 406.0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Deferred tax assets — net | 23.8 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 60.2 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 23.8 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 60.2 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Intangible assets — net | 32.1 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 33.7 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 32.1 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 33.7 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Goodwill | 37.2 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 37.2 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 37.2 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 37.2 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Other assets | 18.8 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 18.5 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 18.8 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 18.5 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Total | 1,648.0 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1,660.3 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1,648.0 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,660.3 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 73.8 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 56.3 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 73.8 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 56.3 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Intercompany payable | 221.3 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 13.9 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 221.3 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 13.9 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Accrued salaries, wages and related expenses | 36.5 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 39.3 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 36.5 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 39.3 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Other accrued liabilities | 43.8 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 39.9 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 43.8 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 39.9 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Current portion of long-term debt | 0 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |  |  | 0 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |  |  |
Short-term capital leases | 0.1 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0.2 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0.1 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0.2 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Total current liabilities | 375.5 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 149.6 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 375.5 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 149.6 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Net liability of VEBA | 17.2 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |  |  | 17.2 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |  |  |
Deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Long-term intercompany payable | 15.9 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 40.7 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 15.9 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 40.7 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Long-term liabilities | 50.3 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 52.0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 50.3 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 52.0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Long-term debt | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Total liabilities | 458.9 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 242.3 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 458.9 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 242.3 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Total stockholders’ equity | 1,189.1 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1,418.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1,189.1 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,418.0 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Total | 1,648.0 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1,660.3 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 1,648.0 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,660.3 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,323.4 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,275.2 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,326.0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items |  |  |  |  |  |  |  |  | 1,098.3 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,026.0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,090.0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Unrealized losses (gains) on derivative instruments |  |  |  |  |  |  |  |  | 10.4 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (0.7)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (15.2)kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 30.0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 27.0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 25.5 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 69.7 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 70.1 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 69.6 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Non-cash defined benefit net periodic benefit income |  |  |  |  |  |  |  |  | (23.7)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | (11.9)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 46.0 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 47.6 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 57.7 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Other operating charges, net |  |  |  |  |  |  |  |  | 1.5 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 4.5 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 1,186.2 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,099.9 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1,162.5 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | 137.2 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 175.3 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 163.5 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (0.6)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0.5 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (1.0)us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 3.2 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 2.0 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1.5 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
(Loss) income before income taxes |  |  |  |  |  |  |  |  | 139.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 177.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 164.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | (50.2)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (68.1)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (62.6)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Earnings in equity of subsidiaries |  |  |  |  |  |  |  |  | 6.0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 17.6 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 2.6 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Net income |  |  |  |  |  |  |  |  | 95.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 127.3 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 104.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | 19.9 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 131.6 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 164.0 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 81.8 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 131.7 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 164.3 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (56.4)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (66.5)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (42.6)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  |  |  |  |  | 93.5 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 227.8 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 85.0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Proceeds from disposal of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Proceeds from disposition of available for sale securities |  |  |  |  |  |  |  |  | 108.2 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 183.1 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Change in restricted cash |  |  |  |  |  |  |  |  |  |  | 0.7 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0.4 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (41.7)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (110.5)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (126.9)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Repayments of capital lease |  |  |  |  |  |  |  |  | (0.1)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (0.1)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (0.1)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Repayment of promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | (4.7)us-gaap_RepaymentsOfNotesPayable / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash paid for financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  |  |  |  |  |  |  |  | 0.8 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1.1 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 1.3 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash dividend paid to stockholders |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash dividend returned to the Company |  |  |  |  |  |  |  |  |  |  | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  |  |
Intercompany loan |  |  |  |  |  |  |  |  | (23.2)kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (130.5)kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 189.1 kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (22.5)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (129.5)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 185.6 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Net increase (decrease) in cash and cash equivalents during the period |  |  |  |  |  |  |  |  | 17.6 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (108.3)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 223.0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  | 157.7 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 266.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 157.7 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 266.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  |  | 43.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Cash and cash equivalents at end of period | 175.3 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 157.7 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  |  | 175.3 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 157.7 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | 266.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |  | 43.0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 6.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 6.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  | 1.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Short-term investments | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 3.2 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 2.1 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 3.2 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.1 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Intercompany receivables | 0.9 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.2 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.9 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0.2 kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Other | 5.3 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 8.1 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 5.3 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 8.1 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Inventories | 7.6 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 6.4 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 7.6 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 6.4 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Prepaid expenses and other current assets | 0.4 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.4 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.4 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0.4 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Total current assets | 19.8 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 24.0 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 19.8 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 24.0 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Property, plant and equipment — net | 17.5 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 15.3 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 17.5 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 15.3 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Long-term intercompany receivables | 15.9 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 9.5 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 15.9 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 9.5 kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Net asset of VEBAs | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Deferred tax assets — net | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Intangible assets — net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Other assets | 0.1 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.1 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.1 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0.1 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Total | 53.3 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 48.9 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 53.3 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 48.9 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 6.3 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 5.5 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 6.3 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 5.5 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Intercompany payable | 3.3 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.1 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 3.3 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0.1 kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Accrued salaries, wages and related expenses | 3.1 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 3.4 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 3.1 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 3.4 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Other accrued liabilities | 0.8 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 1.4 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.8 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1.4 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Current portion of long-term debt | 0 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |  |  | 0 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |  |  |
Short-term capital leases | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Total current liabilities | 13.5 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 10.4 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 13.5 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 10.4 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Net liability of VEBA | 0 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |  |  | 0 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |  |  |
Deferred tax liabilities | 0.9 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 1.2 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0.9 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1.2 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Long-term intercompany payable | 0 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 1.7 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1.7 kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Long-term liabilities | 8.0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 11.2 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 8.0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 11.2 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Long-term debt | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Total liabilities | 22.4 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 24.5 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 22.4 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 24.5 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Total stockholders’ equity | 30.9 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 24.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 30.9 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 24.4 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Total | 53.3 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 48.9 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 53.3 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 48.9 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 133.9 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 118.0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 124.0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items |  |  |  |  |  |  |  |  | 117.8 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 105.7 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 110.2 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Unrealized losses (gains) on derivative instruments |  |  |  |  |  |  |  |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.1 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1.1 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1.0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 9.9 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 8.9 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 8.2 kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Non-cash defined benefit net periodic benefit income |  |  |  |  |  |  |  |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total selling, administrative, research and development and general |  |  |  |  |  |  |  |  | 9.9 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 8.9 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 8.2 kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Other operating charges, net |  |  |  |  |  |  |  |  | 0 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 0 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 128.8 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 115.7 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 119.4 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | 5.1 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.3 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 4.6 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 0.4 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0.6 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
(Loss) income before income taxes |  |  |  |  |  |  |  |  | 5.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 5.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | 0.8 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 15.7 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (2.3)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Earnings in equity of subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Net income |  |  |  |  |  |  |  |  | 6.3 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 18.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.9 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | 6.6 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 19.0 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1.9 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 6.7 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 9.2 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 5.9 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (3.0)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (3.9)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (1.5)us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Proceeds from disposal of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Proceeds from disposition of available for sale securities |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Change in restricted cash |  |  |  |  |  |  |  |  |  |  | 1.0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (0.4)us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (3.0)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (2.9)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (1.9)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Repayments of capital lease |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Repayment of promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfNotesPayable / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash paid for financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  |  |  |  |  |  |  |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash dividend paid to stockholders |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash dividend returned to the Company |  |  |  |  |  |  |  |  |  |  | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  |  |
Intercompany loan |  |  |  |  |  |  |  |  | (8.1)kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (1.9)kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (3.4)kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (8.1)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (1.9)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (3.4)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Net increase (decrease) in cash and cash equivalents during the period |  |  |  |  |  |  |  |  | (4.4)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 4.4 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 0.6 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  | 6.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 6.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  |  | 1.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Cash and cash equivalents at end of period | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 6.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  |  | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 6.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 2.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |  | 1.8 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Short-term investments | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_AvailableForSaleSecuritiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade, less allowance for doubtful receivables | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Intercompany receivables | (209.1)kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (0.3)kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (209.1)kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.3)kalu_IntercompanyReceivablesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Other | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_OtherReceivables / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Inventories | (0.9)us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (0.6)us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (0.9)us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.6)us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Prepaid expenses and other current assets | 0 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Total current assets | (210.0)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (0.9)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (210.0)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.9)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | (1,241.7)us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,464.4)us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,241.7)us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (1,464.4)us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Property, plant and equipment — net | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Long-term intercompany receivables | (15.9)kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (42.4)kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (15.9)kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (42.4)kalu_IntercompanyReceivablesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Net asset of VEBAs | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 kalu_NetAssetInRespectOfVebas / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Deferred tax assets — net | 7.1 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 8.9 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 7.1 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 8.9 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Intangible assets — net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Other assets | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Total | (1,460.5)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,498.8)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,460.5)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (1,498.8)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Intercompany payable | (224.6)kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (14.0)kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (224.6)kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (14.0)kalu_IntercompanyPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Accrued salaries, wages and related expenses | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Other accrued liabilities | 0 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Current portion of long-term debt | 0 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |  |  | 0 us-gaap_SecuredDebtCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |  |  |
Short-term capital leases | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Total current liabilities | (224.6)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (14.0)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (224.6)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (14.0)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Net liability of VEBA | 0 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |  |  | 0 kalu_NetLiabilityInRespectOfVeba / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |  |  |
Deferred tax liabilities | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Long-term intercompany payable | (15.9)kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (42.4)kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (15.9)kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (42.4)kalu_IntercompanyPayableNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Long-term liabilities | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Long-term debt | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Total liabilities | (240.5)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (56.4)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (240.5)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (56.4)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Total stockholders’ equity | (1,220.0)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,442.4)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,220.0)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (1,442.4)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Total | (1,460.5)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,498.8)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | (1,460.5)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (1,498.8)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (101.2)us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (95.7)us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (89.9)us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items |  |  |  |  |  |  |  |  | (98.6)us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (92.8)us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (84.0)us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Unrealized losses (gains) on derivative instruments |  |  |  |  |  |  |  |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 kalu_UnrealizedGainsLossesOnOperationalHedgingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Selling, administrative, research and development and general |  |  |  |  |  |  |  |  | (2.3)kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (2.4)kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (5.7)kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Non-cash defined benefit net periodic benefit income |  |  |  |  |  |  |  |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total selling, administrative, research and development and general |  |  |  |  |  |  |  |  | (2.3)kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (2.4)kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (5.7)kalu_TotalSellingAdministrativeResearchAndDevelopmentAndGeneralExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Other operating charges, net |  |  |  |  |  |  |  |  | 0 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_OtherOperatingIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | (100.9)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (95.2)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (89.7)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | (0.3)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.5)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.2)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0.6 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0.4 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0.1 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | (0.6)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.3)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.1)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
(Loss) income before income taxes |  |  |  |  |  |  |  |  | (0.3)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.4)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (0.2)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | 14.1 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 14.0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 11.1 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Earnings in equity of subsidiaries |  |  |  |  |  |  |  |  | (115.7)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (158.9)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (117.8)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Net income |  |  |  |  |  |  |  |  | (101.9)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (145.3)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (106.9)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Comprehensive (loss) income |  |  |  |  |  |  |  |  | (26.5)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (150.6)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (165.9)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Proceeds from disposal of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Proceeds from disposition of available for sale securities |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Change in restricted cash |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Repayments of capital lease |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_RepaymentsOfLongTermCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Repayment of promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_RepaymentsOfNotesPayable / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash paid for financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Excess tax benefit upon vesting of non-vested shares and dividend payment on unvested shares expected to vest |  |  |  |  |  |  |  |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash dividend paid to stockholders |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash dividend returned to the Company |  |  |  |  |  |  |  |  |  |  | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  |  |
Intercompany loan |  |  |  |  |  |  |  |  | 0 kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 kalu_RepaymentsOfProceedsFromIntercompanyloan / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Net increase (decrease) in cash and cash equivalents during the period |  |  |  |  |  |  |  |  | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Cash and cash equivalents at end of period | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |  | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
VEBAs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash defined benefit net periodic benefit income |  |  |  |  |  |  |  |  | $ (23.7)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / kalu_PensionAndOtherPostretirementBenefitPlanTypeAxis = kalu_VebasMember |  | $ (22.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / kalu_PensionAndOtherPostretirementBenefitPlanTypeAxis = kalu_VebasMember |  | $ (11.9)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / kalu_PensionAndOtherPostretirementBenefitPlanTypeAxis = kalu_VebasMember |  |  |  |
[1] | See Note 14 for the supplemental disclosure on non-cash transactions.

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- Definition Net Asset In Respect Of Union Vebas. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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