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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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs |  |  |
EVA measurement period | 1 year |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | $ 12.7 kalu_ShortTermIncentiveCompensationExpense | $ 15.7 kalu_ShortTermIncentiveCompensationExpense | $ 14.4 kalu_ShortTermIncentiveCompensationExpense
Fabricated Products |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 9.6 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 11.2 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 9.9 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember
All Other |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 3.1 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | 4.5 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | 4.5 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember
Cost of products sold, excluding depreciation and amortization and other items |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | 4.7 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 4.6 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 4.3 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, administrative, research and development and general |  |  |
Compensation charges associated with STI Plans |  |  |
Costs recorded in connection with STI plans | $ 8.0 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpensesMember | $ 11.1 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpensesMember | $ 10.1 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpensesMember

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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

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kalu_AllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=kalu_FabricatedProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |