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Earnings Per Share, Other Disclosures (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 30, 2010
Potential dilutive effect of options and Warrants |  |  |  |  |  |  |  |
Options outstanding to purchase common shares |  | 16,645 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber |  | 20,791 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber |  |  |  |
Average exercise price per share |  | $ 80.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  | $ 80.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |
Potential dilutive effect of shares underlying the options |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  |
Dividends |  |  |  |  |  |  |  |
Payment of cash dividends to stockholders |  | $ 25.4 us-gaap_PaymentsOfDividendsCommonStock | [1] | $ 23.0 us-gaap_PaymentsOfDividendsCommonStock | [1] | $ 19.6 us-gaap_PaymentsOfDividendsCommonStock | [1] |
Payment of quarterly cash dividends |  | $ 1.40 us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 1.20 us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 1.00 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Cash dividend returned to the Company | 0.6 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | [1] | 0.6 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | [1] | 0 kalu_Receiptsofcashdividendsfromdistributionofbankruptcytrust | [1] |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |  |  |  |  |
Shares returned from distribution of bankruptcy trust, shares |  |  |  | 9,001 kalu_Sharesreturnedfromdistributionofbankruptcytrustshares |  |  |  |
Repurchase of common shares pursuant to an authorization from the Board, shares |  | 633,230 us-gaap_TreasuryStockSharesAcquired |  | 1,232,077 us-gaap_TreasuryStockSharesAcquired |  | 0 us-gaap_TreasuryStockSharesAcquired |  |
Weighted-average price of repurchases of common shares |  | $ 70.87 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  | $ 64.35 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |
Repurchase of common shares pursuant to an authorization from the Board, value |  | 44.9 us-gaap_TreasuryStockValueAcquiredCostMethod |  | 79.3 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |
Common shares available for additional share repurchase |  | $ 72.8 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  | $ 117.6 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |  |
Warrant Transactions |  |  |  |  |  |  |  |
Potential dilutive effect of options and Warrants |  |  |  |  |  |  |  |
Number of common shares underlying the Warrants outstanding |  | 3,700,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember |  | 3,600,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember |  |  |  | 3,700,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember
Average exercise price of common shares underlying warrants |  | $ 60.70 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember |  | $ 61.08 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |  |  |  |  |
Shares returned from distribution of bankruptcy trust, shares | 9,001 kalu_Sharesreturnedfromdistributionofbankruptcytrustshares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Repurchase of common shares pursuant to an authorization from the Board, shares |  | 633,230 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,232,077 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
[1] | See Note 14 for the supplemental disclosure on non-cash transactions.

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