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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
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]    
Gross Amounts of Recognized Assets $ 85.7us-gaap_DerivativeFairValueOfDerivativeAsset $ 81.8us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeAssetFairValueGrossLiability 0us-gaap_DerivativeAssetFairValueGrossLiability
Net Amounts of Assets Presented in the Consolidated Balance Sheets 85.7us-gaap_DerivativeAssets 81.8us-gaap_DerivativeAssets
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments 0.8us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 1.2us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received 0us-gaap_DerivativeCollateralRightToReclaimCash 0us-gaap_DerivativeCollateralRightToReclaimCash
Net Amount 84.9us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 80.6us-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 0us-gaap_DerivativeLiabilityFairValueGrossAsset 0us-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 0us-gaap_DerivativeCollateralObligationToReturnCash 0us-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 0.9us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 1.0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember
Net Amounts of Assets Presented in the Consolidated Balance Sheets 0.9us-gaap_DerivativeAssets
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 1.0us-gaap_DerivativeAssets
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments 0.8us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 0.8us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received 0us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 0us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember
Net Amount 0.1us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 0.2us-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 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 0us-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 0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithNettingAgreementsMember		 0us-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 84.8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 [1] 80.4us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 [1]
Gross Amounts Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember
Net Amounts of Assets Presented in the Consolidated Balance Sheets 84.8us-gaap_DerivativeAssets
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 [1] 80.4us-gaap_DerivativeAssets
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received 0us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 0us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember
Net Amount 84.8us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 [2] 80.4us-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 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 0us-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 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Pledged 0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithoutNettingAgreementsMember		 0us-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   0.4us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember
Gross Amounts Offset in the Consolidated Balance Sheets   0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember
Net Amounts of Assets Presented in the Consolidated Balance Sheets   0.4us-gaap_DerivativeAssets
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Financial Instruments   0.4us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember
Gross Amounts Not Offset in the Consolidated Balance Sheets - Cash Collateral Received   0us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember
Net Amount   0us-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 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember		 0us-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 0us-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 0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_CounterpartyNameAxis
= kalu_CounterpartyWithPartialNettingAgreementsMember		 0us-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).