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Subsequent Events (Details) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 13, 2015 | Jan. 21, 2015 | Jan. 28, 2015
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Cash dividend declared per common share | $ 1.4 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.2 us-gaap_CommonStockDividendsPerShareDeclared | $ 1 us-gaap_CommonStockDividendsPerShareDeclared |  |  |
Conversion price of note | $ 47.80 us-gaap_DebtInstrumentConvertibleConversionPrice1 |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Cash dividend declared per common share |  |  |  | $ 0.40 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Dividends |  |  |  | $ 7,100,000 us-gaap_Dividends / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Conversion price of note |  |  |  |  | $ 47.70 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Convertible Notes |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount | 20.9186 us-gaap_DebtInstrumentConvertibleConversionRatio1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Principal amount in conversion feature | 1,000 kalu_PrincipalAmountInConversionFeature / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_ConvertibleDebtMember |  |  |  |  |
Convertible Notes | Subsequent Event |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  | 20.9664 us-gaap_DebtInstrumentConvertibleConversionRatio1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_ConvertibleDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Principal amount in conversion feature |  |  |  |  | 1,000 kalu_PrincipalAmountInConversionFeature / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_ConvertibleDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Call Options |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Exercise price of call options | $ 47.80 kalu_ExercisePriceOfCallOption / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_CallOptionMember |  |  |  |  |
Call Options | Subsequent Event |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Exercise price of call options |  |  |  |  | $ 47.70 kalu_ExercisePriceOfCallOption / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_CallOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Warrants |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Exercise price per share of Warrants | $ 60.70 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember | $ 61.08 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember |  |  |  |
Warrants | Subsequent Event |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  | $ 60.57 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Union VEBA | Subsequent Event |  |  |  |  |  |
Subsequent Events (Textuals) [Abstract] |  |  |  |  |  |
Maximum Contribution |  |  |  |  |  | $ 17,100,000 kalu_MaximumContribution / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kalu_UnionVebaMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: 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.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Conversion Rate -URI http://asc.fasb.org/extlink&oid=6509012 + Details
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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