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Other Income, Net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Income and Expenses [Abstract] |  |  |  |  |  |
Interest income | $ 1.0 us-gaap_InvestmentIncomeInterest |  | $ 0.4 us-gaap_InvestmentIncomeInterest |  | $ 0.4 us-gaap_InvestmentIncomeInterest |
Unrealized gains on financial derivatives | 3.6 kalu_UnrealizedGainLossOnFinancialDerivatives | [1] | 3.2 kalu_UnrealizedGainLossOnFinancialDerivatives | [1] | 0.8 kalu_UnrealizedGainLossOnFinancialDerivatives | [1]
Realized gains on investments | 1.0 us-gaap_RealizedInvestmentGainsLosses |  | 1.4 us-gaap_RealizedInvestmentGainsLosses |  | 0.5 us-gaap_RealizedInvestmentGainsLosses |
Distribution from third party trust | 0 kalu_Sharesreturnedfromdistributionofbankruptcytrustvalue |  | 0.6 kalu_Sharesreturnedfromdistributionofbankruptcytrustvalue | [2] | 0 kalu_Sharesreturnedfromdistributionofbankruptcytrustvalue |
Insurance settlement | 0 us-gaap_OtherNonoperatingGainsLosses |  | 0 us-gaap_OtherNonoperatingGainsLosses |  | 0.4 us-gaap_OtherNonoperatingGainsLosses |
All other, net | 1.1 us-gaap_OtherNonoperatingIncome |  | 0 us-gaap_OtherNonoperatingIncome |  | 0.7 us-gaap_OtherNonoperatingIncome |
Other income, net | $ 6.7 us-gaap_OtherNonoperatingIncomeExpense |  | $ 5.6 us-gaap_OtherNonoperatingIncomeExpense |  | $ 2.8 us-gaap_OtherNonoperatingIncomeExpense |
[1] | See “Derivative Financial Instruments” in Note 1 for a discussion of accounting policy for such instruments.
[2] | See Note 12 for discussion of the distribution.

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- Definition Unrealized Gain (Loss) on Financial Derivatives + References No definition available. + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Other aggregate amounts of gains or losses resulting from nonoperating activities (for example, interest and dividend revenue, property, plant and equipment impairment loss, and so forth.) not otherwise defined. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7,9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 + Details
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