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Valhi Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders Equity Note [Abstract] |
Schedule of Common Stock Outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Shares of common stock
​ |  | Issued |  | Treasury |  | Outstanding
​ | ​ | (In millions)
Balance at December 31, 2019, 2020 and 2021 |  | 29.6 |  | (1.1) |  | 28.5
Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) attributable to Valhi stockholders comprises changes in equity as presented in the table below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |
Balance at beginning of year | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.8
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  | ​
Unrealized gain (loss) arising during the year | ​ |  | — | ​ |  | .1 | ​ |  | (.1)
Balance at end of year | ​ | $ | 1.7 | ​ | $ | 1.8 | ​ | $ | 1.7
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (75.6) | ​ | $ | (76.8) | ​ | $ | (67.4)
Other comprehensive gain (loss) arising during the year | ​ |  | (1.2) | ​ |  | 9.4 | ​ |  | (4.8)
Balance at end of year | ​ | $ | (76.8) | ​ | $ | (67.4) | ​ | $ | (72.2)
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (134.0) | ​ | $ | (146.6) | ​ | $ | (154.1)
Other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 7.2 | ​ |  | 9.8 | ​ |  | 10.7
Net actuarial gain (loss) arising during the year | ​ |  | (19.8) | ​ |  | (17.3) | ​ |  | 22.5
Balance at end of year | ​ | $ | (146.6) | ​ | $ | (154.1) | ​ | $ | (120.9)
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | 1.7 | ​ | $ | 1.0 | ​ | $ | .3
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.8) | ​ |  | (.8) | ​ |  | (.3)
Net actuarial gain arising during the year | ​ |  | .1 | ​ |  | .1 | ​ |  | .1
Balance at end of year | ​ | $ | 1.0 | ​ | $ | .3 | ​ | $ | .1
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of year | ​ | $ | (206.2) | ​ | $ | (220.7) | ​ | $ | (219.4)
Other comprehensive income (loss) | ​ |  | (14.5) | ​ |  | 1.3 | ​ |  | 28.1
Balance at end of year | ​ | $ | (220.7) | ​ | $ | (219.4) | ​ | $ | (191.3)

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