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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated other comprehensive loss – Changes in accumulated other comprehensive income (loss) attributable to Valhi stockholders are presented in the table below.
| Three months ended |  |  | Six months ended |
| June 30, |  |  | June 30, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
| (In millions) |
Accumulated other comprehensive income (loss), net of tax and noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 1.7 |  |  | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | 1.8 |
Other comprehensive income (loss) - unrealized gains (losses) arising during the period |  | .1 |  |  |  | (.1 | ) |  |  | .1 |  |  |  | (.1 | )
Balance at end of period | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | 1.8 |  |  | $ | 1.7 |
Currency translation adjustment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (104.4 | ) |  | $ | (66.1 | ) |  | $ | (76.8 | ) |  | $ | (67.4 | )
Other comprehensive income (loss) |  | 12.0 |  |  |  | 1.3 |  |  |  | (15.6 | ) |  |  | 2.6 |
Balance at end of period | $ | (92.4 | ) |  | $ | (64.8 | ) |  | $ | (92.4 | ) |  | $ | (64.8 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (144.3 | ) |  | $ | (151.6 | ) |  | $ | (146.6 | ) |  | $ | (154.1 | )
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost |  | 2.2 |  |  |  | 2.5 |  |  |  | 4.5 |  |  |  | 5.0 |
Balance at end of period | $ | (142.1 | ) |  | $ | (149.1 | ) |  | $ | (142.1 | ) |  | $ | (149.1 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | .8 |  |  | $ | .1 |  |  | $ | 1.0 |  |  | $ | .3 |
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost |  | (.1 | ) |  |  | - |  |  |  | (.3 | ) |  |  | (.2 | )
Balance at end of period | $ | .7 |  |  | $ | .1 |  |  | $ | .7 |  |  | $ | .1 |
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (246.2 | ) |  | $ | (215.8 | ) |  | $ | (220.7 | ) |  | $ | (219.4 | )
Other comprehensive income (loss) |  | 14.2 |  |  |  | 3.7 |  |  |  | (11.3 | ) |  |  | 7.3 |
Balance at end of period | $ | (232.0 | ) |  | $ | (212.1 | ) |  | $ | (232.0 | ) |  | $ | (212.1 | )

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