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v3.23.1

Valhi Stockholder's Equity (Tables) | 3 Months Ended
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Mar. 31, 2023
Equity [Abstract] |
Accumulated Other Comprehensive Loss (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
​

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