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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 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 |
| March 31, |
| 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 |
Other comprehensive loss - unrealized losses arising during the period |  | - |  |  |  | - |
Balance at end of period | $ | 1.7 |  |  | $ | 1.8 |
Currency translation adjustment: |  |  |  |  |  |  |
Balance at beginning of period | $ | (76.8 | ) |  | $ | (67.4 | )
Other comprehensive income (loss) |  | (27.6 | ) |  |  | 1.3 |
Balance at end of period | $ | (104.4 | ) |  | $ | (66.1 | )
Defined benefit pension plans: |  |  |  |  |  |  |
Balance at beginning of period | $ | (146.6 | ) |  | $ | (154.1 | )
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost |  | 2.3 |  |  |  | 2.5 |
Balance at end of period | $ | (144.3 | ) |  | $ | (151.6 | )
OPEB plans: |  |  |  |  |  |  |
Balance at beginning of period | $ | 1.0 |  |  | $ | .3 |
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost |  | (.2 | ) |  |  | (.2 | )
Balance at end of period | $ | .8 |  |  | $ | .1 |
Total accumulated other comprehensive loss: |  |  |  |  |  |  |
Balance at beginning of period | $ | (220.7 | ) |  | $ | (219.4 | )
Other comprehensive income (loss) |  | (25.5 | ) |  |  | 3.6 |
Balance at end of period | $ | (246.2 | ) |  | $ | (215.8 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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