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Fair Value Measurements Fair Value Measurements, Schedule of Quantitative Information for Level 3 Derivative Contracts (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Asset | $ 95,100,000 us-gaap_DerivativeAssets | $ 85,700,000 us-gaap_DerivativeAssets
Derivative Liability | (110,700,000)us-gaap_DerivativeLiabilities | (96,800,000)us-gaap_DerivativeLiabilities
Midwest Premium Swap Beginning Curve Value | 0.166 kalu_MidwestPremiumSwapBeginningCurveValue |
Midwest Premium Swap Contracts Ending Curve Value | 0.134 kalu_MidwestPremiumSwapContractsEndingCurveValue |
Midwest premium swap contracts | Aluminum | Income Approach Valuation Technique | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Asset | 100,000 us-gaap_DerivativeAssets / us-gaap_DerivativeByNatureAxis = kalu_MidwestPremiumSwapContractsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Derivative Liability | $ (3,700,000)us-gaap_DerivativeLiabilities / us-gaap_DerivativeByNatureAxis = kalu_MidwestPremiumSwapContractsMember / us-gaap_DerivativeInstrumentRiskAxis = kalu_AluminumMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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