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Valhi Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | $ 424.4 |  |
Other comprehensive income (loss) | (27.2) | $ 42.9 | $ (24.9)
Balance at end of year | 635.4 | 424.4 |
Marketable Securities |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | 1.7 | 1.7 | 1.6
Other comprehensive income (loss) |  |  | 0.1
Balance at end of year | 1.7 | 1.7 | 1.7
Interest Rate Swap |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year |  | (1.2) | (1.3)
Other comprehensive income (loss) |  | (1.2) | (1.2)
Balance at end of year |  |  | (1.2)
Less reclassification adjustments for amounts included in realized loss and interest expense |  | 2.4 | 1.3
Currency Translation |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (54.1) | (88.5) | (78.1)
Other comprehensive income (loss) | (21.5) | 34.4 | (10.4)
Balance at end of year | (75.6) | (54.1) | (88.5)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (129.0) | (137.0) | (123.0)
Other comprehensive income (loss) | 7.6 | 6.4 | 5.7
Net actuarial gain (loss) arising during the year | (12.6) | 1.6 | (19.7)
Balance at end of year | (134.0) | (129.0) | (137.0)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | 2.4 | 3.1 | 3.8
Other comprehensive income (loss) | (0.8) | (0.8) | (1.0)
Net actuarial gain (loss) arising during the year | 0.1 | 0.1 | 0.3
Balance at end of year | 1.7 | 2.4 | 3.1
Total Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (179.0) | (221.9) | (197.0)
Balance at end of year | $ (206.2) | $ (179.0) | $ (221.9)

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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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