XML 12 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 19, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 1-09447    
Entity Registrant Name KAISER ALUMINUM CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3030279    
Entity Address, Address Line One 1550 West McEwen Drive    
Entity Address, Address Line Two Suite 500    
Entity Address, City or Town Franklin    
Entity Address, State or Province TN    
Entity Address, Postal Zip Code 37067    
City Area Code 629    
Local Phone Number 252-7040    
Title of 12(b) Security Common stock, par value $0.01 per share    
Trading Symbol KALU    
Security Exchange Name NASDAQ    
Entity Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Document Financial Statement Error Correction [Flag] false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1.1
Entity Common Stock, Shares Outstanding   16,015,791  
Documents Incorporated by Reference

Documents Incorporated by Reference. Certain portions of the registrant’s definitive proxy statement related to the registrant’s 2024 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
ICFR Auditor Attestation Flag true    
Entity Central Index Key 0000811596    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Nashville, Tennessee