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Valhi stockholders equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Common Stock Outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Shares of common stock
​ |  | Issued |  | Treasury |  | Outstanding
​ | ​ | (In millions)
Balance at December 31, 2021, 2022 and 2023 |  | 29.6 |  | (1.1) |  | 28.5
Accumulated Other Comprehensive Loss (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |
Balance at beginning of year | ​ | $ | 1.8 | ​ | $ | 1.7 | ​ | $ | 1.6
Other comprehensive income: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Unrealized gain (loss) arising during the year | ​ |  | (.1) | ​ |  | (.1) | ​ |  | .1
Balance at end of year | ​ | $ | 1.7 | ​ | $ | 1.6 | ​ | $ | 1.7
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (67.4) | ​ | $ | (72.2) | ​ | $ | (91.5)
Other comprehensive income (loss) arising during the year | ​ |  | (4.8) | ​ |  | (19.3) | ​ |  | 2.7
Balance at end of year | ​ | $ | (72.2) | ​ | $ | (91.5) | ​ | $ | (88.8)
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (154.1) | ​ | $ | (120.9) | ​ | $ | (55.0)
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 10.7 | ​ |  | 7.3 | ​ |  | 1.9
Net actuarial gain (loss) arising during the year | ​ |  | 22.5 | ​ |  | 58.4 | ​ |  | (10.0)
Plan settlement | ​ |  | — | ​ |  | .2 | ​ |  | 4.3
Balance at end of year | ​ | $ | (120.9) | ​ | $ | (55.0) | ​ | $ | (58.8)
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | .3 | ​ | $ | .1 | ​ | $ | 1.0
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.3) | ​ |  | (.5) | ​ |  | (.7)
Net actuarial gain arising during the year | ​ |  | .1 | ​ |  | 1.4 | ​ |  | .1
Balance at end of year | ​ | $ | .1 | ​ | $ | 1.0 | ​ | $ | .4
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (219.4) | ​ | $ | (191.3) | ​ | $ | (143.9)
Other comprehensive income (loss) | ​ |  | 28.1 | ​ |  | 47.4 | ​ |  | (1.6)
Balance at end of year | ​ | $ | (191.3) | ​ | $ | (143.9) | ​ | $ | (145.5)

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