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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2022
Equity [Abstract] |
Stockholders' Equity | Note 14 – 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 | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2021 |  | 2022 |  | 2021 |  | 2022
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ | ​
Balance at beginning of period | ​ | $ | 1.8 | ​ | $ | 1.7 | ​ | $ | 1.8 | ​ | $ | 1.7
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Unrealized loss arising during the period | ​ |  | (.1) | ​ |  | — | ​ |  | (.1) | ​ |  | —
Balance at end of period | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.7 | ​ | $ | 1.7
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (66.1) | ​ | $ | (68.0) | ​ | $ | (67.4) | ​ | $ | (72.2)
Other comprehensive gain (loss) arising during the period | ​ |  | 1.3 | ​ |  | (24.1) | ​ |  | 2.6 | ​ |  | (19.9)
Balance at end of period | ​ | $ | (64.8) | ​ | $ | (92.1) | ​ | $ | (64.8) | ​ | $ | (92.1)
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (151.6) | ​ | $ | (119.1) | ​ | $ | (154.1) | ​ | $ | (120.9)
Other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 2.5 | ​ |  | 1.8 | ​ |  | 5.0 | ​ |  | 3.6
Balance at end of period | ​ | $ | (149.1) | ​ | $ | (117.3) | ​ | $ | (149.1) | ​ | $ | (117.3)
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .1 | ​ | $ | — | ​ | $ | .3 | ​ | $ | .1
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | — | ​ |  | (.1) | ​ |  | (.2) | ​ |  | (.2)
Balance at end of period | ​ | $ | .1 | ​ | $ | (.1) | ​ | $ | .1 | ​ | $ | (.1)
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (215.8) | ​ | $ | (185.4) | ​ | $ | (219.4) | ​ | $ | (191.3)
Other comprehensive income (loss) | ​ |  | 3.7 | ​ |  | (22.4) | ​ |  | 7.3 | ​ |  | (16.5)
Balance at end of period | ​ | $ | (212.1) | ​ | $ | (207.8) | ​ | $ | (212.1) | ​ | $ | (207.8)
​ 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. At June 30, 2022, approximately 1.5 million shares were available for repurchase under Kronos’ prior repurchase authorizations. During the second quarter of 2022, CompX acquired 78,900 shares of its Class A common stock for an aggregate amount of approximately $1.7 million. Of these shares, 70,000 shares were purchased in a market transaction, and 8,900 shares were purchased from two affiliates in two separate private transactions that were approved in advance by CompX’s independent directors. During the first quarter of 2021, CompX purchased 50,000 shares of its Class A common stock in a market transaction for approximately $.8 million. At June 30, 2022, .5 million shares were available for purchase under CompX’s prior repurchase authorizations. During the second quarter of 2022, NL purchased 2,000 shares of its common stock from Kronos for a nominal amount in a private transaction that was approved in advance by NL’s independent directors.

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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 http://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 http://asc.fasb.org/extlink&oid=123367319&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 http://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 http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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