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Employee Incentive Plans, Short Term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Compensation charges associated with STI Plans |  |
Total costs recorded in connection with STI plans | $ 3.9 | $ 2.2
Fabricated Products |  |
Compensation charges associated with STI Plans |  |
Total costs recorded in connection with STI plans | 2.7 | 1.7
All Other |  |
Compensation charges associated with STI Plans |  |
Total costs recorded in connection with STI plans | 1.2 | 0.5
Cost of products sold |  |
Compensation charges associated with STI Plans |  |
Total costs recorded in connection with STI plans | 1.2 | 1.1
Selling, administrative, research and development, and general |  |
Compensation charges associated with STI Plans |  |
Total costs recorded in connection with STI plans | $ 2.7 | $ 1.1

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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