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Employee Incentive Plans, Short Term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
EVA measurement period |  |  | 1 year |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | $ 3.9 | $ 1.9 | $ 11.0 | $ 6.4
Fabricated Products |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | 2.6 | 1.3 | 7.6 | 4.7
All Other |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | 1.3 | 0.6 | 3.4 | 1.7
Cost of products sold |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | 1.1 | 0.6 | 3.4 | 2.5
Selling, administrative, research and development, and general |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | $ 2.8 | $ 1.3 | $ 7.6 | $ 3.9

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- Definition EVA measurement period + References No definition available. + Details
Name: | kalu_EvaMeasurementPeriod
Namespace Prefix: | kalu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | kalu_IncentiveCompensationPlanAbstract
Namespace Prefix: | kalu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Short Term Incentive Compensation Expense. + References No definition available. + Details
Name: | kalu_ShortTermIncentiveCompensationExpense
Namespace Prefix: | kalu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration