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Summary of Significant Accounting Policies - Summarizes of Total Deferred Implementation Costs and Accumulated Amortization Related to Hosted Cloud Computing Software (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2023
Hosting Arrangement, Service Contract [Abstract] |
Amortization period | 9 years

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- Definition Hosting arrangement, service contract, implementation cost, amortization period. + References No definition available. + Details
Name: | kalu_HostingArrangementServiceContractImplementationCostAmortizationPeriod
Namespace Prefix: | kalu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_HostingArrangementServiceContractAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration