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Document and Entity Information
May 05, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 05, 2021
Entity Registrant Name Kronos Worldwide, Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 1-31763
Entity Tax Identification Number 76-0294959
Entity Address, Address Line One 5430 LBJ Freeway
Entity Address, Address Line Two Suite 1700
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75240-2620
City Area Code 972
Local Phone Number 233-1700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001257640
Title of 12(b) Security Common Stock
Trading Symbol KRO
Security Exchange Name NYSE