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Employee Benefits, Defined Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
VEBAs |
VEBA Postretirement Medical Obligations |
Cash flow in determining VEBA obligation | $ 20.0
VEBAs | Maximum |
VEBA Postretirement Medical Obligations |
Administrative expenses of the VEBAs obligation | 0.3
Union VEBA |
VEBA Postretirement Medical Obligations |
Number of trustees | 4
Percent allocation of total contribution between VEBAs | 85.50%
Union VEBA | Company Appointed |
VEBA Postretirement Medical Obligations |
Number of trustees | 2
Salaried VEBA |
VEBA Postretirement Medical Obligations |
Percent allocation of total contribution between VEBAs | 14.50%
Variable cash contribution | VEBAs |
VEBA Postretirement Medical Obligations |
Annual VEBA contribution paid | 20.0
Variable cash contribution | VEBAs | Maximum |
VEBA Postretirement Medical Obligations |
Variable cash contribution obligation to VEBAs | $ 20.0
Variable cash contribution | VEBAs | Annual Cash Flows up to $20 Million |
VEBA Postretirement Medical Obligations |
Postretirement medical plan contribution obligation percentage | 10.00%
Variable cash contribution | VEBAs | Annual Cash Flows in Excess of $20 Million |
VEBA Postretirement Medical Obligations |
Postretirement medical plan contribution obligation percentage | 20.00%

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- Definition Administrative Expense Obligation + References No definition available. + Details
Name: | kalu_AdministrativeExpenseObligation
Namespace Prefix: | kalu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Annual VEBA contribution paid + References No definition available. + Details
Name: | kalu_AnnualVebaContributionPaid
Namespace Prefix: | kalu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cash flow in determining VEBA obligation + References No definition available. + Details
Name: | kalu_CashFlowInDetermingVebaObligation
Namespace Prefix: | kalu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of Trustees. + References No definition available. + Details
Name: | kalu_NumberOfTrustees
Namespace Prefix: | kalu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Percent allocation of total contribution between VEBAs + References No definition available. + Details
Name: | kalu_PercentAllocationOfTotalContributionBetweenVebas
Namespace Prefix: | kalu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Postretirement medical plan contribution obligation. + References No definition available. + Details
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Namespace Prefix: | kalu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Postretirement Medical Plan Contribution Obligation Percentage. + References No definition available. + Details
Name: | kalu_PostretirementMedicalPlanContributionObligationPercentage
Namespace Prefix: | kalu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration