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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 01, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 1-5467    
Entity Registrant Name VALHI, INC.    
Entity Central Index Key 0000059255    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-0110150    
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    
Title of 12(b) Security Common stock    
Trading Symbol VHI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Documents Incorporated by Reference

The information required by Part III is incorporated by reference from the Registrant’s definitive proxy statement to be filed with the Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this report.

    
Current Fiscal Year End Date --12-31    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Common Stock, Shares Outstanding   28,277,093  
Entity Public Float     $ 58.8
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Dallas, Texas