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Derivative Financial Instruments and Related Hedging Programs, Hedging Discussion (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 29, 2010
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Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |
Aggregate fair value of derivative instruments in a net liability position | $ (11.4)us-gaap_DerivativeNetLiabilityPositionAggregateFairValue |  |
Principal amount of notes | 225.0 us-gaap_DebtInstrumentFaceAmount | 225.0 us-gaap_DebtInstrumentFaceAmount |
Convertible Notes |  |  |
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |
Principal amount of notes |  |  | $ 175.0 us-gaap_DebtInstrumentFaceAmount / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_ConvertibleDebtMember

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959 + Details
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