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Employee Benefits, Net Periodic Benefit Costs and Charges Relating To All Other Employee Benefit Plans(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
VEBAs: |  |
Total net periodic postretirement benefit cost (income) relating to VEBAs | $ 0.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | $ (5.6)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Pre-tax loss on settlement of Union VEBA |  | 0 kalu_PretaxlossonsettlementofUnionVEBA
Deferred compensation plan | (0.4)us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | (0.2)us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Defined contribution plans | (4.0)us-gaap_DefinedContributionPlanCostRecognized | (4.0)us-gaap_DefinedContributionPlanCostRecognized
Multiemployer pension plans | 0.9 us-gaap_MultiemployerPlanPeriodContributions | 0.9 us-gaap_MultiemployerPlanPeriodContributions
Charges Relating To Other Benefit Plans | 5.3 kalu_ChargesRelatingToOtherBenefitPlans | 5.1 kalu_ChargesRelatingToOtherBenefitPlans
Total other employee benefit plans | 498.1 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans | (0.5)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans
Fabricated Products |  |
VEBAs: |  |
Total other employee benefit plans | 4.6 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 4.6 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember
All Other |  |
VEBAs: |  |
Total other employee benefit plans | 493.5 kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | (5.1)kalu_DefinedBenefitPlanNetPeriodicBenefitCostAndChargesRelatingToOtherBenefitPlans / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember
VEBAs |  |
VEBAs: |  |
Service cost | 0 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | 0.6 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Interest cost | 0.7 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | 4.1 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Expected return on plan assets | (1.1)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | (12.8)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Amortization of prior service cost | 0.7 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | 2.8 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Amortization of net actuarial loss (gain) | 0.3 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | (0.3)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Total net periodic postretirement benefit cost (income) relating to VEBAs | 0.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | (5.6)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Pre-tax loss on settlement of Union VEBA | 492.2 kalu_PretaxlossonsettlementofUnionVEBA / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | 0 kalu_PretaxlossonsettlementofUnionVEBA / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember
Total Charges Relating To VEBAs | $ 492.8 kalu_TotalChargesRelatingToVEBAs / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember | $ (5.6)kalu_TotalChargesRelatingToVEBAs / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_VebasMember

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- Definition Charges Relating To Other Benefit Plans + References No definition available. + Details
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- Definition Defined benefit plan net periodic benefit cost and charges relating to other benefit plans. + References No definition available. + Details
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- Definition Pre-tax loss on settlement of Union VEBA + References No definition available. + Details
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- Definition Total Charges Relating To VEBAs + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 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)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 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)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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 (h)(2) -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 (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + 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 actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + 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 (h)(1) -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 -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&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=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450657-114947 + Details
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