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Employee Incentive Plans, Short term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | $ 8.4 | $ 6.8 | $ 6.0
Fabricated Products |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 5.9 | 4.8 | 4.7
All Other |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 2.5 | 2.0 | 1.3
Cost of products sold |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 3.2 | 2.9 | 2.8
Selling, administrative, research and development and general |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | $ 5.2 | $ 3.9 | $ 3.2

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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