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Multiemployer Pension Plans (Details) (USD $) | 12 Months Ended
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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 | $ 4,000,000 us-gaap_MultiemployerPlanPeriodContributions |  | $ 3,800,000 us-gaap_MultiemployerPlanPeriodContributions |  | $ 3,900,000 us-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 | 3,100,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = kalu_UswaPlanMember | [3] | 2,900,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = kalu_UswaPlanMember | [3] | 3,000,000 us-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 | 3 kalu_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 | 1.25 kalu_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 | 1.50 kalu_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 | 1.75 kalu_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 | 900,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember | [4] | 900,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember | [4] | 900,000 us-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 | 3,000,000 kalu_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 | $ 5,000,000 kalu_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.

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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=35742057&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=35742057&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=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". 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 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire first in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. 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 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire last in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. 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 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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