995200100 - Statement - CONSOLIDATED BALANCE SHEETS
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995200200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS
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995200300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
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995200500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS
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99940203 - Disclosure - Business and geographic segments - Segment Operating Performance (Details)
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99940303 - Disclosure - Business combinations, dispositions and related transactions - Components of Net Distributions from LPC (Details)
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99940304 - Disclosure - Business combinations, dispositions and related transactions - Summary of Financial Information (Details)
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99940305 - Disclosure - Business combinations - Assets acquired and liabilities assumed (Details)
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99940401 - Disclosure - Accounts and other receivables, net - Components of Accounts and Other Receivables (Details)
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99940501 - Disclosure - Inventories, net (Details)
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99940701 - Disclosure - Other assets - Components (Details)
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99940702 - Disclosure - Other assets - Schedule of Maturities of Operating Lease Liabilities (Details)
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99940901 - Disclosure - Long-term debt (Details)
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99940908 - Disclosure - Long-Term Debt - Aggregate Maturities of Long-Term Debt (Details)
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99941001 - Disclosure - Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details)
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99941103 - Disclosure - Defined contribution and defined benefit retirement plans - Schedule of Funded Status (Details)
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99941104 - Disclosure - Defined benefit pension plans - Components of Net Periodic Defined Benefit Pension Benefit Cost (Details)
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99941108 - Disclosure - Defined contribution and defined benefit retirement plans - Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Details)
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99941301 - Disclosure - Other income, net - Schedule of Components of Other Income (Details)
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99941401 - Disclosure - Income taxes - Components of Comprehensive Provision for Income Taxes Allocation (Details)
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99941402 - Disclosure - Income taxes - Effective Income Tax Rate Reconciliation (Details)
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99941403 - Disclosure - Income taxes - Component of Income Taxes Expenses (Details)
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99941404 - Disclosure - Income taxes - Comprehensive Provision for Income Tax (Details)
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99941405 - Disclosure - Income taxes - Components of Net Deferred Tax Asset (Liability) (Details)
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99941408 - Disclosure - Income taxes - Net tax payments (Details)
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99941802 - Disclosure - Commitments and contingencies - Changes in Accrued Environmental Remediation and Related Costs (Details)
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995200090 - Document - Document and Entity Information
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995200400 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
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995200405 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
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995210201 - Disclosure - Business and geographic segments
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995210401 - Disclosure - Accounts and other receivables, net
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995210501 - Disclosure - Inventories, net
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995210901 - Disclosure - Long-term debt
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995211001 - Disclosure - Accounts payable and accrued liabilities
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995211301 - Disclosure - Other income, net
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995211401 - Disclosure - Income taxes
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995211501 - Disclosure - Noncontrolling interest in subsidiaries
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995211801 - Disclosure - Commitments and contingencies
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995212001 - Disclosure - Restructuring costs
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995212101 - Disclosure - Recent accounting pronouncements
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99920102 - Disclosure - Summary of significant accounting policies (Policies)
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99930203 - Disclosure - Business and geographic segments (Tables)
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99930303 - Disclosure - Business combinations, dispositions and related transactions (Tables)
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99930403 - Disclosure - Accounts and other receivables, net (Tables)
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99930503 - Disclosure - Inventories, net (Tables)
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99930703 - Disclosure - Other assets (Tables)
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99930903 - Disclosure - Long-term debt (Tables)
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99931003 - Disclosure - Accounts payable and accrued liabilities (Tables)
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99931103 - Disclosure - Defined contribution and defined benefit retirement plans (Tables)
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99931303 - Disclosure - Other income, net (Tables)
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99931403 - Disclosure - Income taxes (Tables)
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99931503 - Disclosure - Noncontrolling interest in subsidiaries (Tables)
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99931603 - Disclosure - Valhi stockholders' equity (Tables)
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99931803 - Disclosure - Commitments and contingencies (Tables)
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99932003 - Disclosure - Restructuring costs (Tables)
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99940101 - Disclosure - Organization and basis of presentation - Additional Information (Details)
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99940102 - Disclosure - Summary of significant accounting policies - Computation of Depreciation of Property and Equipment (Details)
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99940103 - Disclosure - Summary of significant accounting policies - Revenue Recognition Period (Details)
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40103 - Disclosure - Summary of significant accounting policies - Revenue Recognition Period Default (Details)
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99940201 - Disclosure - Business and geographic segments - Holding Percentage of Subsidiaries (Details)
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99940202 - Disclosure - Business and geographic segments - Additional Information (Details)
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99940204 - Disclosure - Business and geographic segments - Depreciation and Amortization (Details)
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99940205 - Disclosure - Business and geographic segments - Net Sales by Point of Origin and Point of Destination (Details)
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99940206 - Disclosure - Business and geographic segments - Net Property and Equipment by Segment (Details)
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99940301 - Disclosure - Business combinations, dispositions and related transactions - Acquisition of Remaining Joint Venture Interest in LPC (Details)
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99940302 - Disclosure - Business combinations, dispositions and related transactions - Additional Information (Details)
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99940602 - Disclosure - Marketable Securities - Schedule of Marketable Securities and Fair Value Measurements (Detail)
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99940703 - Disclosure - Other assets - Additional Information (Details)
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99940801 - Disclosure - Goodwill - Changes in Carrying Amount of Goodwill (Details)
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99940802 - Disclosure - Goodwill - Additional Information (Details)
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99940902 - Disclosure - Long-term debt - Valhi Contran Credit Facility - Additional Information (Details)
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99940903 - Disclosure - Long-term debt - Kronos 9.50 Senior Secured Notes - Additional Information (Details)
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99940904 - Disclosure - Long-term debt - Kronos 3.75 Senior Secured Notes - Additional Information (Details)
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99940905 - Disclosure - Long-term debt - Subordinated, Unsecured Term Loan from Contran (Details)
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99940906 - Disclosure - Long-term debt - Revolving Credit Facility - Additional Information (Details)
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99940907 - Disclosure - Long-Term Debt - Notes Payable Land well - Additional Information (Details)
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99941101 - Disclosure - Defined contribution and defined benefit retirement plans - Additional Information (Details)
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99941102 - Disclosure - Defined contribution and defined benefit retirement plans - Schedule of Defined Benefit Plan Expected Future Payments (Details)
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99941105 - Disclosure - Defined contribution and defined benefit retirement plans - Schedule of Plans for which Accumulated Benefit Obligations Exceeds Plan Assets (Details)
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99941106 - Disclosure - Defined contribution and defined benefit retirement plans - Summary of Actuarial Assumptions Used to Benefit Obligations (Details)
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99941107 - Disclosure - Defined contribution and defined benefit retirement plans - Summary of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Credit) (Details)
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99941109 - Disclosure - Defined contribution and defined benefit retirement plans - Composition of Pension Plan Assets (Details)
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99941110 - Disclosure - Defined contribution and defined benefit retirement plans- Schedule of Rollforward of Change in Fair Value of Level 3 Assets (Details)
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99941201 - Disclosure - Disaggregation of sales - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Details)
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99941202 - Disclosure - Disaggregation of sales - Schedule of Disaggregates of Net Sales of our Component Products and Real Estate Management and Development Segments (Detail)
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99941302 - Disclosure - Other income, net - Additional Information (Details)
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99941406 - Disclosure - Income taxes - Additional Information (Details)
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99941407 - Disclosure - Income taxes - Changes in Uncertain Tax Positions (Details)
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99941501 - Disclosure - Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Details)
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99941502 - Disclosure - Noncontrolling interest in subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Details)
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99941601 - Disclosure - Valhi Stockholders' Equity - Schedule of Common Stock Outstanding (Details)
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99941602 - Disclosure - Valhi Stockholders' Equity - Additional Information (Details)
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99941603 - Disclosure - Valhi Stockholders' equity - Accumulated Other Comprehensive Loss (Details)
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99941701 - Disclosure - Related party transactions - Additional Information (Details)
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99941702 - Disclosure - Related party transactions - Receivables from and Payables to Affiliates (Details)
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99941801 - Disclosure - Commitments and contingencies - Lead Pigment Litigation-NL and Environmental Matters and Litigation - Additional Information (Details)
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99941803 - Disclosure - Commitments and contingencies - Other Litigation and Other Matters - Additional Information (Details)
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99941901 - Disclosure - Fair value measurements and financial instruments - Financial Instruments not Carried at Fair Value (Details)
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99941902 - Disclosure - Fair value measurements and financial instruments - Financial instruments recorded on a fair value (Details)
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99942001 - Disclosure - Restructuring costs (Details)
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995200105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)
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995210101 - Disclosure - Summary of significant accounting policies
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995210301 - Disclosure - Business combinations, dispositions and related transactions
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995210701 - Disclosure - Other assets
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995210801 - Disclosure - Goodwill
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995211101 - Disclosure - Defined contribution and defined benefit retirement plans
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995211201 - Disclosure - Disaggregation of sales
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995211601 - Disclosure - Valhi stockholders' equity
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995211701 - Disclosure - Related party transactions
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995211901 - Disclosure - Fair value measurements and financial instruments
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99930103 - Disclosure - Summary of Significant Accounting Policies (Tables)
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99930803 - Disclosure - Goodwill (Tables)
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99931203 - Disclosure - Disaggregation of Sales (Tables)
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99931703 - Disclosure - Related party transactions (Tables)
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99931903 - Disclosure - Fair value measurements and financial instruments (Tables)
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99900 - Disclosure - Standard And Custom Axis Domain Defaults
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