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Multiemployer Pension Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Multiemployer Pension Plan Disclosure      
Percentage of employees participating in multiemployer pension plans to total employees 55.00%kalu_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipantsToAllEmployees    
Contributions of the Company $ 4,000,000us-gaap_MultiemployerPlanPeriodContributions $ 3,800,000us-gaap_MultiemployerPlanPeriodContributions $ 3,900,000us-gaap_MultiemployerPlanPeriodContributions
Company's contributions to the multiemployer plans is less than   5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersContributions  
USW Plan      
Multiemployer Pension Plan Disclosure      
Employer Identification Number 236648508    
Pension Protection Act Zone Status   Green [1] Green [1]
FIP/RP Status Pending/Implemented in 2013 No [2]    
Contributions of the Company 3,100,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember		 [3] 2,900,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember		 [3] 3,000,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember		 [3]
Surcharge Imposed in 2014 No    
Expiration Date of Collective-Bargaining Agreement, First Sep. 30, 2015    
Expiration Date of Collective-Bargaining Agreement, Last Nov. 30, 2017    
Number of collective-bargaining agreements 3kalu_NumberOfCollectiveBargainingAgreements
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember		    
USW Plan | Newark, Ohio and Spokane (Trentwood), Washington Facilities      
Multiemployer Pension Plan Disclosure      
Percentage of employees covered by bargaining agreement 86.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipants
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember
/ kalu_ProductionFacilitiesAxis
= kalu_NewarkOhioAndSpokaneWashingtonFacilitiesMember		    
USW Plan | Newark, Ohio and Spokane (Trentwood), Washington Facilities | Starting July 2010 Until July 2015      
Multiemployer Pension Plan Disclosure      
Monthly contributions per hour worked by each bargaining unit employee 1.25kalu_MonthlyContributionsPerHourWorkedByEachBargainingUnitEmployee
/ kalu_DatePeriodAxis
= kalu_StartingJulyTwoThousandTenUntilJulyTwoThousandFifteenMember
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember
/ kalu_ProductionFacilitiesAxis
= kalu_NewarkOhioAndSpokaneWashingtonFacilitiesMember		    
USW Plan | Newark, Ohio and Spokane (Trentwood), Washington Facilities | Starting July 2015      
Multiemployer Pension Plan Disclosure      
Monthly contributions per hour worked by each bargaining unit employee 1.50kalu_MonthlyContributionsPerHourWorkedByEachBargainingUnitEmployee
/ kalu_DatePeriodAxis
= kalu_StartingJulyTwoThousandFifteenMember
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember
/ kalu_ProductionFacilitiesAxis
= kalu_NewarkOhioAndSpokaneWashingtonFacilitiesMember		    
USW Plan | Newark, Ohio and Spokane (Trentwood), Washington Facilities | Ending in July Two Thousand Nineteen [Member] [Domain]      
Multiemployer Pension Plan Disclosure      
Monthly contributions per hour worked by each bargaining unit employee 1.75kalu_MonthlyContributionsPerHourWorkedByEachBargainingUnitEmployee
/ kalu_DatePeriodAxis
= kalu_StartinginJuly2019MemberDomain
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember
/ kalu_ProductionFacilitiesAxis
= kalu_NewarkOhioAndSpokaneWashingtonFacilitiesMember		    
USW Plan | Richmond (Bellwood), Virginia Facility      
Multiemployer Pension Plan Disclosure      
Percentage of employees covered by bargaining agreement 9.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipants
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember
/ kalu_ProductionFacilitiesAxis
= kalu_BellwoodVirginiaFacilityMember		    
USW Plan | Florence, Alabama Facility      
Multiemployer Pension Plan Disclosure      
Percentage of employees covered by bargaining agreement 5.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfEmployersParticipants
/ us-gaap_MultiemployerPlanNameAxis
= kalu_UswaPlanMember
/ kalu_ProductionFacilitiesAxis
= kalu_FlorenceAlabamaFacilityMember		    
Other Funds      
Multiemployer Pension Plan Disclosure      
Contributions of the Company 900,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember		 [4] 900,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember		 [4] 900,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember		 [4]
Multiemployer Pension Plans | Minimum      
Multiemployer Pension Plan Disclosure      
Estimated annual contribution to pension and other postretirement benefit plans 3,000,000kalu_EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans
/ kalu_PensionAndOtherPostretirementBenefitPlanTypeAxis
= kalu_MultiemployerPensionPlansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Multiemployer Pension Plans | Maximum      
Multiemployer Pension Plan Disclosure      
Estimated annual contribution to pension and other postretirement benefit plans $ 5,000,000kalu_EstimatedAnnualContributionToPensionAndOtherPostretirementBenefitPlans
/ kalu_PensionAndOtherPostretirementBenefitPlanTypeAxis
= kalu_MultiemployerPensionPlansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
[1] The most recent Pension Protection Act zone status available in 2014 and 2013 for the Steelworkers Pension Trust is for the plan's year-end at December 31, 2013 and December 31, 2012, respectively. The zone status is based on information that the Company received from the plan and is certified by the plan's actuary. Among other factors, plans in the green zone are at least 80 percent funded.
[2] The “FIP/RP Status Pending/Implemented” column indicates if a Financial Improvement Plan (FIP) or a Rehabilitation Plan (RP) is either pending or has been implemented for the plan under the Pension Protection Act.
[3] The Company is party to three USW collective-bargaining agreements that require contributions to the Steelworkers Pension Trust. As of December 31, 2014, USW collective bargaining agreements covering employees at the Newark, Ohio ("Newark") and Spokane, Washington ("Trentwood") facilities covers 86% of the Company's USW-represented employees and expires in September 2015. In January 2015, the Company and the USW entered into a new five-year labor agreement relating to these facilities, effective October 1, 2015 through September 30, 2020. The Company's monthly contributions per hour worked by each bargaining unit employee at the Newark and Trentwood facilities are (in whole dollars) $1.25 and will increase to (in whole dollars) $1.50 in July 2015 and $1.75 in 2019. The union contracts covering employees at the Richmond (Bellwood), Virginia facility and Florence, Alabama facility cover 9% and 5% of the Company's USW-represented employees, respectively, and expire in November 2017 and March 2017, respectively.
[4] Other Funds consists of plans that are not individually significant.