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Derivative Financial Instruments and Related Hedging Programs, Offsetting of Derivative Instruments by Counterparty (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Assets | $ 85.7 us-gaap_DerivativeFairValueOfDerivativeAsset |  | $ 81.8 us-gaap_DerivativeFairValueOfDerivativeAsset |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeAssetFairValueGrossLiability |  | 0 us-gaap_DerivativeAssetFairValueGrossLiability |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 85.7 us-gaap_DerivativeAssets |  | 81.8 us-gaap_DerivativeAssets |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |  | 1.2 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 us-gaap_DerivativeCollateralRightToReclaimCash |  | 0 us-gaap_DerivativeCollateralRightToReclaimCash |
Net Amount | 84.9 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral |  | 80.6 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Liabilities | (96.8)us-gaap_DerivativeFairValueOfDerivativeLiability |  | (86.1)us-gaap_DerivativeFairValueOfDerivativeLiability |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset |  | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (96.8)us-gaap_DerivativeLiabilities |  | (86.1)us-gaap_DerivativeLiabilities |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (0.8)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral |  | (1.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 us-gaap_DerivativeCollateralObligationToReturnCash |  | 0 us-gaap_DerivativeCollateralObligationToReturnCash |
Net Amount | (96.0)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral |  | (84.9)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral |
Counterparty (with Netting Agreements) |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Assets | 0.9 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 1.0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 0.9 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 1.0 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 0.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Net Amount | 0.1 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 0.2 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Liabilities | (8.0)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | (1.6)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (8.0)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | (1.6)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (0.8)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | (0.8)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Net Amount | (7.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |  | (0.8)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember |
Counterparty (without Netting Agreements) |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Assets | 84.8 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1] | 80.4 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1]
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |  | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 84.8 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1] | 80.4 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |  | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |  | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |
Net Amount | 84.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [2] | 80.4 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Liabilities | (85.0)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1] | (83.2)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1]
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |  | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (85.0)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1] | (83.2)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |  | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |  | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember |
Net Amount | (85.0)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [2] | (83.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | [1]
Counterparty (with partial Netting Agreements) |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Assets |  |  | 0.4 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Offset in the Consolidated Balance Sheets |  |  | 0 us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Net Amounts of Assets Presented in the Consolidated Balance Sheets |  |  | 0.4 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments |  |  | 0.4 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received |  |  | 0 us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Net Amount |  |  | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract] |  |  |  |
Gross Amounts of Recognized Liabilities | (3.8)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |  | (1.3)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |  | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets | (3.8)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |  | (1.3)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |  | (0.4)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |  | 0 us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Net Amount | $ (3.8)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |  | $ (0.9)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
[1] | Such amounts include the fair value of the Bifurcated Conversion Feature and Option Assets at December 31, 2013 (see Note 11).
[2] | Such amounts include the fair value of the Bifurcated Conversion Feature and Option Assets at December 31, 2014 (see Note 11).

X
- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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