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v2.4.1.9

Earnings Per Share, Textuals (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Potential dilutive effect of options and Warrants |  |  |
Options outstanding to purchase common shares | 16,645 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber |  | 16,645 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Average exercise price per share | $ 80.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  | $ 80.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Trading days warrants are exercisable | 120 days |  |
Add: dilutive effect of warrants | 0 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 471,000 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |
Dividends |  |  |
Cash dividends paid | $ 7,100,000 us-gaap_PaymentsOfDividendsCommonStock | $ 6,400,000 us-gaap_PaymentsOfDividendsCommonStock |
Cash dividends paid per share | $ 0.40 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.35 us-gaap_CommonStockDividendsPerShareCashPaid |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |
Repurchase of common stock | 405,259 us-gaap_TreasuryStockSharesAcquired | 184,400 us-gaap_TreasuryStockSharesAcquired |
Weighted-average price per share of common stock repurchased | $ 74.05 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 69.07 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Repurchase of common stock, total cost | 30,000,000 us-gaap_TreasuryStockValueAcquiredCostMethod | 12,700,000 us-gaap_TreasuryStockValueAcquiredCostMethod |
Common share amount available for additional share repurchase | $ 42,700,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  | $ 72,800,000 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 / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember |  |
Average exercise price of common shares underlying Warrants | $ 60.57 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember |  |
Warrant [Member] |  |  |
Potential dilutive effect of options and Warrants |  |  |
Number of common shares underlying the Warrants outstanding |  | 3,600,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember | 3,600,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember
Average exercise price of common shares underlying Warrants |  | $ 60.98 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / kalu_ConvertibleRelatedTransactionsAxis = us-gaap_WarrantMember |
Warrants [Member] |  |  |
Potential dilutive effect of options and Warrants |  |  |
Add: dilutive effect of warrants |  | 470,735 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_WarrantsMember |

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