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Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains and Losses Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | $ (6.8)us-gaap_UnrealizedGainLossOnDerivatives | $ 3.9 us-gaap_UnrealizedGainLossOnDerivatives | $ 16.0 us-gaap_UnrealizedGainLossOnDerivatives
Not Designated as Hedging Instrument |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | 7.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (6.5)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (19.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (6.8)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 3.9 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 16.0 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Aluminum |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | 6.9 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (5.5)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (9.0)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (2.6)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (3.1)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 10.1 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Natural Gas |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | 1.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (1.8)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (6.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (6.0)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2.6 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 4.3 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_NaturalGasMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Electricity |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | (0.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (3.4)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Unrealized gains (losses) | (1.8)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 1.1 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.8 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_ElectricityMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Foreign Currency |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | 0 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_ForeignCurrencyMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.1 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_ForeignCurrencyMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = kalu_ForeignCurrencyMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Operational Risk Hedges [Member] |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | (10.4)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.7 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 15.2 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = kalu_OperationalRiskHedgesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Option Assets relating to the Convertible Notes | Hedges Relating to the Convertible Notes |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | 5.2 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 24.2 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 9.0 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_CallOptionMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Bifurcated Conversion Feature of the Convertible Notes | Hedges Relating to the Convertible Notes |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | $ (1.6)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (21.0)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (8.2)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_HedgesRelatingToNotesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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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=31042434&loc=d3e3602-108585 + Details
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