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Valhi Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders Equity Note [Abstract] |
Schedule of Common Stock Outstanding |
| Shares of common stock |
| Issued |  |  | Treasury |  |  | Outstanding |
| (In millions) |
Balance at December 31, 2018, 2019 and 2020 |  | 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, |
| 2018 |  |  | 2019 |  |  | 2020 |
| (In millions) |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | 1.7 |  |  | $ | 1.7 |  |  | $ | 1.7 |
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Unrealized gain arising during the year |  | - |  |  |  | - |  |  |  | .1 |
Balance at end of year | $ | 1.7 |  |  | $ | 1.7 |  |  | $ | 1.8 |
Currency translation: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (54.1 | ) |  | $ | (75.6 | ) |  | $ | (76.8 | )
Other comprehensive gain (loss) arising during the year |  | (21.5 | ) |  |  | (1.2 | ) |  |  | 9.4 |
Balance at end of year | $ | (75.6 | ) |  | $ | (76.8 | ) |  | $ | (67.4 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (129.0 | ) |  | $ | (134.0 | ) |  | $ | (146.6 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net losses included in net periodic pension cost |  | 7.6 |  |  |  | 7.2 |  |  |  | 9.8 |
Net actuarial loss arising during the year |  | (12.6 | ) |  |  | (19.8 | ) |  |  | (17.3 | )
Balance at end of year | $ | (134.0 | ) |  | $ | (146.6 | ) |  | $ | (154.1 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | 2.4 |  |  | $ | 1.7 |  |  | $ | 1.0 |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost |  | (.8 | ) |  |  | (.8 | ) |  |  | (.8 | )
Net actuarial gain arising during the year |  | .1 |  |  |  | .1 |  |  |  | .1 |
Balance at end of year | $ | 1.7 |  |  | $ | 1.0 |  |  | $ | .3 |
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (179.0 | ) |  | $ | (206.2 | ) |  | $ | (220.7 | )
Other comprehensive income (loss) |  | (27.2 | ) |  |  | (14.5 | ) |  |  | 1.3 |
Balance at end of year | $ | (206.2 | ) |  | $ | (220.7 | ) |  | $ | (219.4 | )

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