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Employee Benefits, Net Periodic Benefit Costs and Charges Relating To Other Benefit Plans(Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |  |  |
Non-cash net periodic benefit income | $ (23.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | $ (22.0)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | $ (11.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |
Total | (14.4)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans |  | (12.9)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans |  | (3.0)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans |
Fabricated Products |  |  |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |  |  |
Deferred compensation plan | 0.2 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 0.3 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 0.2 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
Defined contribution plans | 7.3 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 7.2 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 6.8 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
Total | 7.8 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | [1] | 8.0 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | [1] | 7.4 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | [1]
All Other |  |  |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |  |  |
Deferred compensation plan | 0.7 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |  | 0.9 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |  | 0.8 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |
Defined contribution plans | 0.8 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |  | 0.7 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |  | 0.7 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |
Total | (22.2)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |  | (20.9)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |  | (10.4)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember |
Canadian pension plan | Fabricated Products |  |  |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |  |  |
Non-cash net periodic benefit income | 0.3 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 0.5 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |  | 0.4 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember |
VEBAs | All Other |  |  |  |  |  |
Net Periodic Benefit Costs and Charges Relating to Other Benefit Plans |  |  |  |  |  |
Non-cash net periodic benefit income | $ (23.7)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | [2] | $ (22.5)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | [2] | $ (11.9)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | [2]
[1] | Substantially all of the Fabricated Products segment’s employee benefits related charges are in Cost of products sold, excluding depreciation and amortization and other items with the remaining balance in Selling, administrative, research and development and general.
[2] | Included within the Statements of Consolidated Income as Net periodic pension benefit income relating to VEBAs.

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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=35743120&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=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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