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Derivative Financial Instruments and Related Hedging Programs, Offsetting of Derivative Instruments by Counterparty (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | $ 95.1 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 85.7 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 | 95.1 us-gaap_DerivativeAssets | 85.7 us-gaap_DerivativeAssets
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0.2 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 0.8 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 | 94.9 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 84.9 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (110.7)us-gaap_DerivativeFairValueOfDerivativeLiability | (96.8)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 | (110.7)us-gaap_DerivativeLiabilities | (96.8)us-gaap_DerivativeLiabilities
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (0.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | (0.8)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 | (110.5)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral | (96.0)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Counterparty (with Netting Agreements) |  |
Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | 0.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember | 0.9 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 | 0.1 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember | 0.9 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0.1 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 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember | 0.1 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (8.4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember | (8.0)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 | (8.4)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember | (8.0)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (0.1)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 | (8.3)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember | (7.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithNettingAgreementsMember
Counterparty (without Netting Agreements) |  |
Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | 94.9 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | 84.8 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember
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 | 94.9 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | 84.8 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember
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 | 94.9 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | 84.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember
Derivative Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (96.9)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | (85.0)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember
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 | (96.9)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | (85.0)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember
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 | (96.9)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember | (85.0)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithoutNettingAgreementsMember
Counterparty (with partial Netting Agreements) |  |
Derivative Assets and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Assets | 0.1 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 | 0.1 us-gaap_DerivativeAssets / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember |
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | 0.1 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 Liabilities and Collateral Held by Counterparty |  |
Gross Amounts of Recognized Liabilities | (5.4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember | (3.8)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 | (5.4)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember | (3.8)us-gaap_DerivativeLiabilities / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments | (0.1)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember | 0 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 | $ (5.3)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember | $ (3.8)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_CounterpartyNameAxis = kalu_CounterpartyWithPartialNettingAgreementsMember

X
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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=49121117&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=49121117&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=51824906&loc=SL20225862-175312 Reference 5: 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=51825145&loc=SL20226008-175313 Reference 6: 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 + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&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 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 + Details
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