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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income – Changes in accumulated other comprehensive income (loss) attributable to Valhi stockholders are presented in the table below.
| Three months ended |  |  | Nine months ended |
| September 30, |  |  | September 30, |
| 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |
| (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 |  |  | $ | 1.7 |
Other comprehensive loss - unrealized losses arising during the period |  | - |  |  |  | - |  |  |  | - |  |  |  | .1 |
Balance at end of period | $ | 1.7 |  |  | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | 1.8 |
Currency translation adjustment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (70.9 | ) |  | $ | (92.4 | ) |  | $ | (75.6 | ) |  | $ | (76.8 | )
Other comprehensive income (loss) |  | (12.6 | ) |  |  | 6.8 |  |  |  | (7.9 | ) |  |  | (8.8 | )
Balance at end of period | $ | (83.5 | ) |  | $ | (85.6 | ) |  | $ | (83.5 | ) |  | $ | (85.6 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (130.6 | ) |  | $ | (142.1 | ) |  | $ | (134.0 | ) |  | $ | (146.6 | )
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost |  | 1.7 |  |  |  | 2.3 |  |  |  | 5.1 |  |  |  | 6.8 |
Balance at end of period | $ | (128.9 | ) |  | $ | (139.8 | ) |  | $ | (128.9 | ) |  | $ | (139.8 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 1.3 |  |  | $ | .7 |  |  | $ | 1.7 |  |  | $ | 1.0 |
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost |  | (.2 | ) |  |  | - |  |  |  | (.6 | ) |  |  | (.3 | )
Balance at end of period | $ | 1.1 |  |  |  | .7 |  |  | $ | 1.1 |  |  | $ | .7 |
Total accumulated other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (198.5 | ) |  | $ | (232.0 | ) |  | $ | (206.2 | ) |  | $ | (220.7 | )
Other comprehensive income (loss) |  | (11.1 | ) |  |  | 9.1 |  |  |  | (3.4 | ) |  |  | (2.2 | )
Balance at end of period | $ | (209.6 | ) |  | $ | (222.9 | ) |  | $ | (209.6 | ) |  | $ | (222.9 | )

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