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Income Tax Matters, Effective Tax Rate Reconciliation (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation between income tax provision and statutory income tax provision: |  |  |  |  |  |
Amount of federal income tax provision based on the statutory rate | $ (37.5)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | $ (50.1)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | $ (48.9)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
Decrease in federal valuation allowances | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | 0.1 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | 0.1 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |
Non-deductible compensation expense | (0.1)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost |  | (0.3)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost |  | (0.4)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost |
Non-deductible expense | (0.3)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther |  | (0.9)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther |  | (0.3)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther |
State income taxes, net of federal benefit | 0 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | [1] | (4.4)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | [1] | (3.8)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | [1]
Decrease in state tax rates | 1.6 kalu_Changeinstatetaxrates |  |  |  |  |
Foreign income tax (expense) benefit | 0.3 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | 0 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | (0.5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |
Expiration of statute of limitations | 2.3 kalu_Incometaxreconciliationlapseofstatuteoflimitations |  | 4.6 kalu_Incometaxreconciliationlapseofstatuteoflimitations |  | 0 kalu_Incometaxreconciliationlapseofstatuteoflimitations |
Settlement with taxing authorities | 0 us-gaap_IncomeTaxReconciliationTaxSettlementsForeign |  | 4.4 us-gaap_IncomeTaxReconciliationTaxSettlementsForeign |  | 0 us-gaap_IncomeTaxReconciliationTaxSettlementsForeign |
Advance pricing agreement | 0 us-gaap_IncomeTaxReconciliationOtherAdjustments |  | 2.9 us-gaap_IncomeTaxReconciliationOtherAdjustments |  | 0 us-gaap_IncomeTaxReconciliationOtherAdjustments |
Competent Authority settlement | 0 us-gaap_IncomeTaxReconciliationTaxSettlementsOther |  | 5.3 us-gaap_IncomeTaxReconciliationTaxSettlementsOther |  | 0 us-gaap_IncomeTaxReconciliationTaxSettlementsOther |
Income tax provision | (35.3)us-gaap_IncomeTaxExpenseBenefit |  | (38.4)us-gaap_IncomeTaxExpenseBenefit |  | (53.8)us-gaap_IncomeTaxExpenseBenefit |
Valuation Allowance |  |  |  |  |  |
Current State and Local Tax Expense (Benefit) | 2.3 kalu_Stateincometaxprovisionbenefitbeforeratereconciliationadjustments | [1] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Current | 86.4 us-gaap_DeferredTaxAssetsNetCurrent |  | 36.7 us-gaap_DeferredTaxAssetsNetCurrent |  |  |
Increase (Decrease) in valuation allowance | 0.7 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  | (1.2)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  | 0.1 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Unused state net operating losses |  |  |  |  |  |
Valuation Allowance |  |  |  |  |  |
Increase (Decrease) in valuation allowance |  |  | $ (1.2)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = kalu_UnusedStateNetOperatingLossMember |  |  |
[1] | State income taxes were $2.3 in 2014, but were offset by a $1.6 decrease due to lower tax rates in various states and a $0.7 decrease in the valuation allowance relating to certain state net operating losses. State income taxes of $4.4 in 2013 included a $1.2 increase in the valuation allowance relating to certain unused state net operating losses expected to expire.

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31928-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31958-109318 + 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 increase (decrease) in the valuation allowance for deferred tax assets. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + 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 foreign income tax expense (benefit). + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + 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 nondeductible expenses. + 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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