v3.19.3
Document and Entity Information
Nov. 19, 2019
Cover [Abstract]  
Entity Registrant Name KAISER ALUMINUM CORP
Amendment Flag false
Entity Central Index Key 0000811596
Document Type 8-K
Document Period End Date Nov. 19, 2019
Entity Incorporation State Country Code DE
Entity File Number 1-09447
Entity Tax Identification Number 94-3030279
Entity Address, Address Line One 27422 Portola Parkway
Entity Address, Address Line Two Suite 200
Entity Address, City or Town Foothill Ranch
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92610-2831
City Area Code (949)
Local Phone Number 614-1740
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol KALU
Security Exchange Name NASDAQ
Entity Emerging Growth Company false