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Income Tax Matters, Tax Uncertainties (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other, settlements from tax audit |  |  |  |
Cash tax benefit from settlement of tax audit | $ 7.9 us-gaap_IncomeTaxReconciliationTaxSettlements |  |  |
Cash received from settlement of tax audit | 1.8 us-gaap_ProceedsFromIncomeTaxRefunds | 6.1 us-gaap_ProceedsFromIncomeTaxRefunds |  |
Cash tax benefit from advance pricing agreement | 0 us-gaap_IncomeTaxReconciliationOtherAdjustments | 2.9 us-gaap_IncomeTaxReconciliationOtherAdjustments |  | 0 us-gaap_IncomeTaxReconciliationOtherAdjustments
Reconciliation of changes in the gross unrecognized tax benefits: |  |  |  |
Gross unrecognized tax benefits at beginning of period | 3.8 us-gaap_UnrecognizedTaxBenefits | 15.7 us-gaap_UnrecognizedTaxBenefits |  | 13.7 us-gaap_UnrecognizedTaxBenefits
Gross increases for tax positions of prior years | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 1.3 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross decreases for tax positions of prior years | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (7.6)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |  | (0.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Gross increases for tax positions of current years | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  | 0.4 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Gross decrease for tax positions relating to lapse of a statute of limitation | (1.4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (3.3)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |  | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Foreign currency translation | (0.2)kalu_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation | (1.0)kalu_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation |  | 0.4 kalu_UnrecognizedTaxBenefitsIncreaseDecreaseResultingfromForeignCurrencyTranslation
Gross unrecognized tax benefits at end of period | 2.2 us-gaap_UnrecognizedTaxBenefits | 3.8 us-gaap_UnrecognizedTaxBenefits |  | 15.7 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate if recognized | 1.1 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2.7 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Unrecognized tax benefits, income tax penalties and interest accrued: |  |  |  |
Accrued interest and penalties on unrecognized tax benefits | 1.4 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 2.3 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Accrued interest and penalties on unrecognized tax benefits, current | 0 kalu_AccruedInterestAndPenaltyOnUnrecognizedTaxBenefitsCurrent |  |  |
(Decrease) increase in interest and penalty | (0.9)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | (5.2)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |  | 0.9 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which increased (decreased) Other comprehensive income (loss) | 0.4 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | 0.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | [1] | (0.2)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
FIN 48 |  |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued: |  |  |  |
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which increased (decreased) Other comprehensive income (loss) | 0.3 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = us-gaap_FIN48Member | 0.7 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = us-gaap_FIN48Member |  | (0.5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = us-gaap_FIN48Member
Canada Revenue Agency |  |  |  |
Other, settlements from tax audit |  |  |  |
Cash tax benefit from advance pricing agreement |  | $ 2.6 us-gaap_IncomeTaxReconciliationOtherAdjustments / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_CanadaRevenueAgencyMember |  |
[1] | The presentation of other comprehensive income in the table above has been revised from the prior year presentation to reflect separate amounts for actuarial gains and losses and prior service costs related to plan amendments. The 2013 balances were adjusted to reflect this reclassification. The impacts to the prospective amortization of Prior service cost and Accumulated net actuarial (losses) gains were not material.

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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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