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Employee Incentive Plans, Short Term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | $ 3.2 | $ 2.3 | $ 7.1 | $ 4.5
Fabricated Products |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | 2.3 | 1.7 | 5.0 | 3.4
All Other |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | 0.9 | 0.6 | 2.1 | 1.1
Cost of products sold |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | 1.1 | 0.8 | 2.3 | 1.9
Selling, administrative, research and development, and general |  |  |  |
Compensation charges associated with STI Plans |  |  |  |
Total costs recorded in connection with STI plans | $ 2.1 | $ 1.5 | $ 4.8 | $ 2.6

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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