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Valhi stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2024
Stockholders' equity |
Schedule of Common Stock Outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Shares of common stock
​ |  | Issued |  | Treasury |  | Outstanding
​ | ​ | (In millions)
Balance at December 31, 2022, 2023 and 2024 |  | 29.6 |  | (1.1) |  | 28.5
Schedule of changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2022 |  | 2023 |  | 2024
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |
Balance at beginning of year | ​ | $ | 1.7 | ​ | $ | 1.6 | ​ | $ | 1.7
Other comprehensive income: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Unrealized gain (loss) arising during the year | ​ |  | (.1) | ​ |  | .1 | ​ |  | —
Balance at end of year | ​ | $ | 1.6 | ​ | $ | 1.7 | ​ | $ | 1.7
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (72.2) | ​ | $ | (91.5) | ​ | $ | (88.8)
Other comprehensive income (loss) arising during the year | ​ |  | (19.3) | ​ |  | 2.7 | ​ |  | (22.9)
Balance at end of year | ​ | $ | (91.5) | ​ | $ | (88.8) | ​ | $ | (111.7)
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (120.9) | ​ | $ | (55.0) | ​ | $ | (58.8)
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 7.3 | ​ |  | 1.9 | ​ |  | 2.1
Net actuarial gain (loss) arising during the year | ​ |  | 58.4 | ​ |  | (10.0) | ​ |  | 7.1
Plan settlement | ​ |  | .2 | ​ |  | 4.3 | ​ |  | .2
Balance at end of year | ​ | $ | (55.0) | ​ | $ | (58.8) | ​ | $ | (49.4)
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | .1 | ​ | $ | 1.0 | ​ | $ | .4
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.5) | ​ |  | (.7) | ​ |  | (.3)
Net actuarial gain arising during the year | ​ |  | 1.4 | ​ |  | .1 | ​ |  | .1
Balance at end of year | ​ | $ | 1.0 | ​ | $ | .4 | ​ | $ | .2
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (191.3) | ​ | $ | (143.9) | ​ | $ | (145.5)
Other comprehensive income (loss) | ​ |  | 47.4 | ​ |  | (1.6) | ​ |  | (13.7)
Balance at end of year | ​ | $ | (143.9) | ​ | $ | (145.5) | ​ | $ | (159.2)

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