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v2.4.1.9

Employee Incentive Plans, Short Term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Compensation charges associated with STI Plans |  |
Costs recorded in connection with STI plans | $ 3.3 kalu_ShortTermIncentiveCompensationExpense | $ 2.4 kalu_ShortTermIncentiveCompensationExpense
Fabricated Products |  |
Compensation charges associated with STI Plans |  |
Costs recorded in connection with STI plans | 2.4 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember | 1.9 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_FabricatedProductsMember
All Other |  |
Compensation charges associated with STI Plans |  |
Costs recorded in connection with STI plans | 0.9 kalu_ShortTermIncentiveCompensationExpense / us-gaap_StatementBusinessSegmentsAxis = kalu_AllOtherMember | 0.5 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 | 0.8 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 1.1 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, general, administrative, research and development |  |
Compensation charges associated with STI Plans |  |
Costs recorded in connection with STI plans | $ 2.5 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpensesMember | $ 1.3 kalu_ShortTermIncentiveCompensationExpense / us-gaap_IncomeStatementLocationAxis = kalu_SellingAdministrativeResearchAndDevelopmentAndGeneralExpensesMember

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- Details
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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_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: |