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Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains (Losses) Table (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Summary Of Realized And Unrealized Gains (Losses) |  |
Unrealized gains (losses) | $ (4.5)us-gaap_UnrealizedGainLossOnDerivatives | $ 2.9 us-gaap_UnrealizedGainLossOnDerivatives
Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Unrealized gains (losses) | (4.5)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2.9 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Operational Risk Hedges | Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Realized (losses) gains | (4.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (4.5)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2.0 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Call Options | Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Unrealized gains (losses) | 10.2 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 4.4 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Bifurcated Conversion Feature | Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Unrealized gains (losses) | (10.2)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (3.5)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Aluminum | Operational Risk Hedges | Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Realized (losses) gains | (2.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (4.2)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 1.7 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Natural Gas | Operational Risk Hedges | Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Realized (losses) gains | (1.3)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.7 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (0.7)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.8 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Electricity | Operational Risk Hedges | Not Designated as Hedging Instrument |  |
Summary Of Realized And Unrealized Gains (Losses) |  |
Realized (losses) gains | (0.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.5 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | $ 0.4 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (0.5)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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