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Income Tax Matters, Income Before Income Taxes and Tax Provision Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income before income taxes by geographic area |  |  |
Domestic | $ 102.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 138.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 134.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | 5.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 4.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 5.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes | 107.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 143.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 139.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal income tax (expense) benefit |  |  |
Current federal tax (expense) benefit | (1.0)us-gaap_CurrentFederalTaxExpenseBenefit | 1.1 us-gaap_CurrentFederalTaxExpenseBenefit | 0 us-gaap_CurrentFederalTaxExpenseBenefit
Deferred federal income tax (expense) benefit | 6.4 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (49.7)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (113.0)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal benefit (expense) applied to increase (decrease) Additional capital/Other comprehensive income | (41.6)kalu_FederalIncomeTaxProvisionBenefitOther | 1.3 kalu_FederalIncomeTaxProvisionBenefitOther | 67.4 kalu_FederalIncomeTaxProvisionBenefitOther
Federal income tax (expense) benefit | (36.2)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | (47.3)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | (45.6)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Foreign income tax (expense) benefit |  |  |
Current foreign tax (expense) benefit | 1.0 us-gaap_CurrentForeignTaxExpenseBenefit | 16.2 us-gaap_CurrentForeignTaxExpenseBenefit | (2.3)us-gaap_CurrentForeignTaxExpenseBenefit
Deferred foreign income tax (expense) benefit | 0.3 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (0.5)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (0.2)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign benefit (expense) applied to increase (decrease) Additional capital/Other comprehensive income | (0.5)kalu_ForeignIncomeTaxProvisionBenefitOther | (0.1)kalu_ForeignIncomeTaxProvisionBenefitOther | 0.2 kalu_ForeignIncomeTaxProvisionBenefitOther
Foreign income tax (expense) benefit | 0.8 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | 15.6 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | (2.3)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
State income tax (expense) benefit |  |  |
Current state tax (expense) benefit | (0.6)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (0.2)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 0.2 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred state income tax (expense) benefit | 5.1 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (6.7)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (15.3)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State benefit (expense) applied to increase (decrease) additional capital/Other comprehensive income | (4.4)kalu_StateIncomeTaxProvisionBenefitOther | 0.2 kalu_StateIncomeTaxProvisionBenefitOther | 9.2 kalu_StateIncomeTaxProvisionBenefitOther
State income tax (expense) benefit | 0.1 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | (6.7)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | (5.9)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total income tax (expense) benefit |  |  |
Current income tax (expense) benefit | (0.6)us-gaap_CurrentIncomeTaxExpenseBenefit | 17.1 us-gaap_CurrentIncomeTaxExpenseBenefit | (2.1)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax (expense) benefit | 11.8 us-gaap_DeferredIncomeTaxExpenseBenefit | (56.9)us-gaap_DeferredIncomeTaxExpenseBenefit | (128.5)us-gaap_DeferredIncomeTaxExpenseBenefit
Benefit (expense) applied to increase (decrease) Additional capital/Other comprehensive income | (46.5)us-gaap_OtherIncomeTaxExpenseBenefitContinuingOperations | 1.4 us-gaap_OtherIncomeTaxExpenseBenefitContinuingOperations | 76.8 us-gaap_OtherIncomeTaxExpenseBenefitContinuingOperations
Income tax provision | $ (35.3)us-gaap_IncomeTaxExpenseBenefit | $ (38.4)us-gaap_IncomeTaxExpenseBenefit | $ (53.8)us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a)-(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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