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Valhi Stockholders' Equity - Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | $ 958.6 |
Balance at end of period | 946.4 |
Marketable Securities |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | 1.6 | $ 1.7
Balance at end of period | 1.6 | 1.7
Currency Translation |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | (91.5) | (72.2)
Other comprehensive income | (4.5) | 4.2
Balance at end of period | (96.0) | (68.0)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | (55.0) | (120.9)
Other comprehensive income | 0.6 | 1.8
Balance at end of period | (54.4) | (119.1)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | 1.0 | 0.1
Other comprehensive income | (0.2) | (0.1)
Balance at end of period | 0.8 |
Total Accumulated Other Comprehensive Loss |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | (143.9) | (191.3)
Other comprehensive income | (4.1) | 5.9
Balance at end of period | $ (148.0) | $ (185.4)

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