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Statement of Consolidated Stockholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Financial Position [Abstract] |  |  |
Common Stock, Dividends, Per Share, Declared | $ 1.4 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.2 us-gaap_CommonStockDividendsPerShareDeclared | $ 1 us-gaap_CommonStockDividendsPerShareDeclared
Tax effect on common stock sold by Union VEBA or on which restriction was lifted | $ 0 kalu_TaxEffectOnCommonStockSoldByUnionVebaOrOnWhichRestrictionWasLifted | $ 0 kalu_TaxEffectOnCommonStockSoldByUnionVebaOrOnWhichRestrictionWasLifted | $ 41.3 kalu_TaxEffectOnCommonStockSoldByUnionVebaOrOnWhichRestrictionWasLifted

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- Definition Tax effect on common stock sold by Union VEBA or on which restriction was lifted + References No definition available. + 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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- Details
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