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Fair Value Measurements, Fair Value of Non financial Assets and Liabilities (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Asset Retirement Obligation, Roll Forward |  |  |  |  |
Beginning balance | $ 4,400,000 us-gaap_AssetRetirementObligation |  | $ 4,100,000 us-gaap_AssetRetirementObligation |  | $ 4,000,000 us-gaap_AssetRetirementObligation
Liabilities settled during the period | 0 us-gaap_AssetRetirementObligationLiabilitiesSettled |  | (200,000)us-gaap_AssetRetirementObligationLiabilitiesSettled |  | (500,000)us-gaap_AssetRetirementObligationLiabilitiesSettled
Accretion expense | 400,000 us-gaap_AssetRetirementObligationAccretionExpense |  | 400,000 us-gaap_AssetRetirementObligationAccretionExpense |  | 300,000 us-gaap_AssetRetirementObligationAccretionExpense
Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure | 0 kalu_AssetRetirementObligationAdjustmentToAccretionExpenseFromRevisionOfEstimate | [1] | 100,000 kalu_AssetRetirementObligationAdjustmentToAccretionExpenseFromRevisionOfEstimate | [1] | 300,000 kalu_AssetRetirementObligationAdjustmentToAccretionExpenseFromRevisionOfEstimate
Ending balance | 4,800,000 us-gaap_AssetRetirementObligation |  | 4,400,000 us-gaap_AssetRetirementObligation |  | 4,100,000 us-gaap_AssetRetirementObligation
(Decrease)/increase in basic earnings per share resulting from adjustment |  |  |  |  | $ 0.02 kalu_IncreaseDecreaseInBasicEarningsPerShareResultingFromAdjustment
(Decrease)/increase in diluted earnings per share resulting from adjustment |  |  | $ 0.02 kalu_IncreaseDecreaseInDilutedEarningsPerShareResultingFromAdjustment |  |
Weighted-average credit-adjusted risk-free rate | 8.60%kalu_WeightedAverageCreditAdjustedRiskFreeRate |  |  |  |
Midwest Premium Swap Contracts Beginning Curve Value | 0.236 kalu_MidwestPremiumSwapContractsBeginningCurveValue |  |  |  |
Midwest Premium Swap Contracts Ending Curve Value | $ 0.205 kalu_MidwestPremiumSwapContractsEndingCurveValue |  |  |  |
[1] | The adjustments in 2013 did not have a material impact on the basic and diluted net income per share for 2013. The adjustment in 2012 decreased both basic and diluted net income per share for 2012 by approximately $0.02 per share.

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- Definition Asset Retirement Obligation, Adjustment To Accretion Expense from Revision Of Estimate + References No definition available. + Details
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- Definition Increase (decrease) in basic earnings per share resulting from adjustment + References No definition available. + Details
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- Definition Midwest Premium Swap Contracts Beginning Curve Value + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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