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Valhi Stockholders' Equity - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2019
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Treasury stock, shares | 1,100,000 | 1,100,000 | 1,100,000 |  |  |
Percentage of shares held by majority-owned subsidiary that has to be considered for voting purpose | 100.00% |  |  |  |  |
Director Stock Plan |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Number of shares authorized |  |  |  | 200,000 | 100,000 |
Shares awarded under plan | 6,300 | 9,000 |  |  |  |
Common stock available for future grant | 78,300 |  |  |  |  |
N L Industries Inc |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Treasury stock, shares | 1,200,000 | 1,200,000 |  |  |  |
Unrealized gain (loss) on sale of shares attributable to noncontrolling interest | $ 1.9 | $ (1.7) | $ 1.6 |  |  |
N L Industries Inc | Director Stock Plan |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock available for future grant | 185,750 |  |  |  |  |
Kronos |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Shares available for purchase | 1,017,518 |  |  |  |  |
Treasury stock, shares | 100,000 | 100,000 |  |  |  |
Unrealized gain (loss) on sale of shares attributable to noncontrolling interest | $ 1.9 | $ 1.7 | $ 1.6 |  |  |
Kronos | Director Stock Plan |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock available for future grant | 87,800 |  |  |  |  |
Comp X | Director Stock Plan |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock available for future grant | 119,650 |  |  |  |  |
Common Stock |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Shares available for purchase | 334,000 |  |  |  |  | 833,333

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