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Segment Information, Textuals (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information |  |  |
Unrealized gains (losses) on derivatives | $ (4.5)us-gaap_UnrealizedGainLossOnDerivatives | $ 2.9 us-gaap_UnrealizedGainLossOnDerivatives |
VEBA net periodic pension benefit income | (0.6)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | 5.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |
Fabricated Products |  |  |
Segment Reporting Information |  |  |
Unrealized gains (losses) on derivatives | (4.5)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 2.0 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 |  |
Customer Concentration Risk | Largest Customer | Sales Revenue, Net | Fabricated Products |  |  |
Segment Reporting Information |  |  |
Concentration Risk, Percentage | 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 | 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 |
Customer Concentration Risk | Largest Customer | Accounts Receivable |  |  |
Segment Reporting Information |  |  |
Concentration Risk, Percentage | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = kalu_LargestCustomerMember
Customer Concentration Risk | Second Largest Customer | Sales Revenue, Net | 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 |  |
Customer Concentration Risk | Second Largest Customer | Accounts Receivable |  |  |
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
VEBAs |  |  |
Segment Reporting Information |  |  |
VEBA net periodic pension benefit income | $ (0.6)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | $ 5.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember |

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- Definition Number of Production Facilities. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + 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=56944662&loc=d3e3602-108585 + Details
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