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Derivative Financial Instruments and Related Hedging Programs, Notional Quantity Table (Details) | Mar. 31, 2015
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Remainder of 2015 |
Summary of material derivative positions |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 79.00%kalu_PercentageOfNaturalGasPurchasesForWhichCompanysExposureToFluctuationsInGasPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_RemainderOfCurrentYearMember
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 55.00%kalu_PercentageofElectricityPurchasesForWhichCompanyExposureToFluctuationsInElectricityPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_RemainderOfCurrentYearMember
2016 |
Summary of material derivative positions |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 77.00%kalu_PercentageOfNaturalGasPurchasesForWhichCompanysExposureToFluctuationsInGasPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearOneMember
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 54.00%kalu_PercentageofElectricityPurchasesForWhichCompanyExposureToFluctuationsInElectricityPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearOneMember
2017 |
Summary of material derivative positions |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 29.00%kalu_PercentageOfNaturalGasPurchasesForWhichCompanysExposureToFluctuationsInGasPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearTwoMember
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 27.00%kalu_PercentageofElectricityPurchasesForWhichCompanyExposureToFluctuationsInElectricityPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearTwoMember
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Purchase |
Summary of material derivative positions |
Notional amount of contracts | 82.5 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Sales |
Summary of material derivative positions |
Notional amount of contracts | 0.2 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember
Not Designated as Hedging Instrument | Aluminum | Midwest premium swap contracts | Purchase |
Summary of material derivative positions |
Notional amount of contracts | 82.1 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = kalu_MidwestPremiumSwapContractsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember
Not Designated as Hedging Instrument | Natural Gas | Fixed priced contracts | Purchase |
Summary of material derivative positions |
Notional amount of contracts | 6,700,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember
Not Designated as Hedging Instrument | Electricity | Fixed priced contracts | Purchase |
Summary of material derivative positions |
Notional amount of contracts | 132,020 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember
Not Designated as Hedging Instrument | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |
Summary of material derivative positions |
Notional amount of contracts | 3,668,449 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Hedges Relating to the Convertible Notes | Call Options |
Summary of material derivative positions |
Notional amount of contracts | 3,668,449 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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