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Valhi stockholders' equity: - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | $ 950.5 |  |
Other comprehensive income (loss) | (13.7) | $ (1.6) | $ 47.4
Plan settlement | 0.2 | 4.3 | 0.2
Balance at end of period | 1,036.1 | 950.5 |
Marketable Securities |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | 1.7 | 1.6 | 1.7
Other comprehensive income (loss) |  | 0.1 | (0.1)
Balance at end of period | 1.7 | 1.7 | 1.6
Currency Translation |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | (88.8) | (91.5) | (72.2)
Other comprehensive income (loss) | (22.9) | 2.7 | (19.3)
Balance at end of period | (111.7) | (88.8) | (91.5)
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 | (58.8) | (55.0) | (120.9)
Other comprehensive income (loss) | 2.1 | 1.9 | 7.3
Net actuarial gain (loss) arising during the year | 7.1 | (10.0) | 58.4
Balance at end of period | (49.4) | (58.8) | (55.0)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | 0.4 | 1.0 | 0.1
Other comprehensive income (loss) | (0.3) | (0.7) | (0.5)
Net actuarial gain (loss) arising during the year | 0.1 | 0.1 | 1.4
Balance at end of period | 0.2 | 0.4 | 1.0
Total Accumulated Other Comprehensive Loss |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |
Balance at beginning of period | (145.5) | (143.9) | (191.3)
Balance at end of period | $ (159.2) | $ (145.5) | $ (143.9)

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