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Derivative Financial Instruments and Related Hedging Programs, Notional Quantity Table (Details) | Dec. 31, 2014
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2014 |  |
Summary of material derivative positions |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices have been reduced | 81.00%kalu_PercentageOfNaturalGasPurchasesForWhichTheCompanysExposureToFluctuationsInGasPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearOneMember |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 44.00%kalu_PercentageofElectricityPurchasesForWhichCompanyExposureToFluctuationsInElectricityPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearOneMember |
2015 |  |
Summary of material derivative positions |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices have been reduced | 73.00%kalu_PercentageOfNaturalGasPurchasesForWhichTheCompanysExposureToFluctuationsInGasPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearTwoMember |
2016 |  |
Summary of material derivative positions |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices have been reduced | 12.00%kalu_PercentageOfNaturalGasPurchasesForWhichTheCompanysExposureToFluctuationsInGasPricesHaveBeenReduced / kalu_DatePeriodAxis = kalu_YearThreeMember |
Not Designated as Hedging Instrument | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 3,660,738 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Not Designated as Hedging Instrument | Hedges Relating to the Convertible Notes | Call Options |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 3,660,738 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [2]
Purchase | Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 67.3 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 |
Purchase | Not Designated as Hedging Instrument | Aluminum | Midwest premium swap contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 67.1 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = kalu_MidwestPremiumSwapContractsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | [3]
Purchase | Not Designated as Hedging Instrument | Natural Gas | Fixed priced contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 6,720,000 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 | [4]
Purchase | Not Designated as Hedging Instrument | Electricity | Fixed priced contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 175,200 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 | [5]
[1] | Such amounts include the fair value of the Bifurcated Conversion Feature and Option Assets at December 31, 2013 (see Note 11).
[2] | Such amounts include the fair value of the Bifurcated Conversion Feature and Option Assets at December 31, 2014 (see Note 11).
[3] | Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on the Company's purchases of primary aluminum.
[4] | As of December 31, 2014, the Company had Henry Hub NYMEX-based hedge positions in place to cover exposure to fluctuations in prices for approximately 81%, 73% and 12% of the expected natural gas purchases for 2015, 2016 and 2017, respectively.
[5] | As of December 31, 2014, the Company had Mid-C International Commodity Exchange-based hedge positions in place to cover exposure to fluctuations in prices for approximately 44% of the expected electricity purchases for 2015

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