XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.22.2

Derivatives, Hedging Programs and Other Financial Instruments - Summary of Loss (Gain) Associated with Derivative Contracts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Total of income and expense line items presented in our Statements of Consolidated Loss in which the effects of cash flow hedges are recorded | $ 898.4 | $ 673.3 | $ 1,764.3 | $ 935.8
Cost of Products Sold | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss | 2.4 | (1.1) | 0.8 | (2.5)
Cost of Products Sold | Not Designated as Hedging Instrument | Alloying Metals |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss | (0.5) | (1.5) | (1.1) | (2.6)
(Gain) loss recognized in our Statements of Consolidated Loss Unrealized loss | 2.9 | 0.4 | 1.9 | 0.1
Cash Flow Hedges |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Total of income and expense line items presented in our Statements of Consolidated Loss in which the effects of cash flow hedges are recorded | 898.4 | 673.3 | 1,764.3 | 935.8
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss | 2.9 | (8.7) | (17.0) | (11.4)
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Electricity |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss | (1.1) | (0.7) | (1.4) | (0.7)
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Aluminum |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss | 5.9 | (8.1) | (12.8) | (11.0)
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Alloying Metals |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss |  | 0.2 |  | 0.4
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Natural Gas |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Loss | $ (1.9) | $ (0.1) | $ (2.8) | $ (0.1)

X
- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=kalu_AlloyingMetalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=kalu_AluminumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=kalu_AlloyMetalHedgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=kalu_NaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |