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Valhi stockholders' equity - Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | $ 958.6 |  |
Other comprehensive income (loss) | (1.6) | $ 47.4 | $ 28.1
Plan settlement | 4.3 | 0.2 |
Balance at end of period | 935.8 | 958.6 |
Marketable Securities |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | 1.6 | 1.7 | 1.8
Other comprehensive income (loss) | 0.1 | (0.1) | (0.1)
Balance at end of period | 1.7 | 1.6 | 1.7
Currency Translation |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | (91.5) | (72.2) | (67.4)
Other comprehensive income (loss) | 2.7 | (19.3) | (4.8)
Balance at end of period | (88.8) | (91.5) | (72.2)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | (55.0) | (120.9) | (154.1)
Other comprehensive income (loss) | 1.9 | 7.3 | 10.7
Net actuarial gain (loss) arising during the year | (10.0) | 58.4 | 22.5
Balance at end of period | (58.8) | (55.0) | (120.9)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | 1.0 | 0.1 | 0.3
Other comprehensive income (loss) | (0.7) | (0.5) | (0.3)
Net actuarial gain (loss) arising during the year | 0.1 | 1.4 | 0.1
Balance at end of period | 0.4 | 1.0 | 0.1
Total Accumulated Other Comprehensive Loss |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | (143.9) | (191.3) | (219.4)
Balance at end of period | $ (145.5) | $ (143.9) | $ (191.3)

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