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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2023
Equity [Abstract] |
Stockholders' Equity | Note 15 – Stockholders’ equity: 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,
​ |  | 2022 |  | 2023
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |
Marketable securities: |  | ​ |  |  | ​ | ​
Balance at beginning of period | ​ | $ | 1.7 | ​ | $ | 1.6
Other comprehensive income: | ​ |  |  | ​ |  |
Unrealized gain arising during the period | ​ |  | — | ​ |  | —
Balance at end of period | ​ | $ | 1.7 | ​ | $ | 1.6
Currency translation: | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (72.2) | ​ | $ | (91.5)
Other comprehensive gain (loss) arising during the period | ​ |  | 4.2 | ​ |  | (4.5)
Balance at end of period | ​ | $ | (68.0) | ​ | $ | (96.0)
Defined benefit pension plans: | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (120.9) | ​ | $ | (55.0)
Other comprehensive income: | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 1.8 | ​ |  | .6
Balance at end of period | ​ | $ | (119.1) | ​ | $ | (54.4)
OPEB plans: | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .1 | ​ | $ | 1.0
Other comprehensive income: | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.1) | ​ |  | (.2)
Balance at end of period | ​ | $ | — | ​ | $ | .8
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (191.3) | ​ | $ | (143.9)
Other comprehensive income (loss) | ​ |  | 5.9 | ​ |  | (4.1)
Balance at end of period | ​ | $ | (185.4) | ​ | $ | (148.0)
​ Other – During the first quarter of 2022, Kronos acquired 73,881 shares of its common stock in market transactions for an aggregate purchase price of $1.1 million. During the first quarter of 2023, Kronos acquired 159,796 shares of its common stock in market transactions for an aggregate purchase price of $1.4 million. At March 31, 2023, approximately 1.2 million shares were available for repurchase under Kronos’ stock repurchase program.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI https://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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