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Employee Incentive Plans, Short Term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
EVA measurement period | 1 year |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | $ 14.4 | $ 8.4 | $ 6.8
Fabricated Products |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 9.9 | 5.9 | 4.8
All Other |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 4.5 | 2.5 | 2.0
Cost of products sold, excluding depreciation and amortization and other items |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 4.3 | 3.2 | 2.9
Selling, administrative, research and development, and general |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | $ 10.1 | $ 5.2 | $ 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