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Segment and Geographical Area Information, Textuals (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information |  |  |  |  |  |
Environmental expense | $ 0.8 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease |  | $ 4.5 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease |  | $ 1.2 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease |
Asset impairment charge | 1.5 us-gaap_AssetImpairmentCharges |  | 0 us-gaap_AssetImpairmentCharges |  | 4.4 us-gaap_AssetImpairmentCharges |
Unrealized gains (losses) on derivatives | (6.8)us-gaap_UnrealizedGainLossOnDerivatives |  | 3.9 us-gaap_UnrealizedGainLossOnDerivatives |  | 16.0 us-gaap_UnrealizedGainLossOnDerivatives |
Non-cash defined benefit net periodic benefit income | (23.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | (22.0)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | (11.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |
Fabricated Products |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Environmental expense | 1.2 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 4.0 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 1.1 us-gaap_AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
Asset impairment charge | 1.5 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  |  |  | 4.4 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
Unrealized gains (losses) on derivatives | (10.4)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 0.7 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 15.2 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
United States |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Number of production facilities | 11 kalu_NumberOfProductionFacilities / us-gaap_StatementGeographicalAxis = country_US |  |  |  |  |
Canada |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Number of production facilities | 1 kalu_NumberOfProductionFacilities / us-gaap_StatementGeographicalAxis = country_CA |  |  |  |  |
VEBAs | All Other |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Non-cash defined benefit net periodic benefit income | $ (23.7)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | [1] | $ (22.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | [1] | $ (11.9)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | [1]
Customer Concentration Risk | Net sales | Largest Customer | Fabricated Products |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Concentration risk, percentage | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
Customer Concentration Risk | Net sales | Second Largest Customer | Fabricated Products |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Concentration risk, percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_SecondLargestCustomerMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_SecondLargestCustomerMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  |  |
Customer Concentration Risk | Trade Receivables | Largest Customer |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Concentration risk, percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember |  | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember |  |  |
Customer Concentration Risk | Trade Receivables | Second Largest Customer |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |
Concentration risk, percentage | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_SecondLargestCustomerMember |  | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_SecondLargestCustomerMember |  |  |
[1] | Included within the Statements of Consolidated Income as Net periodic pension benefit income relating to VEBAs.

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- Definition Increase (decrease) in the accrual for environmental loss contingencies during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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