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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss) attributable to Valhi stockholders for the three and six months ended June 30, 2017 and 2018 are presented in the table below.
| Three months ended June 30, |  |  | Six months ended June 30, |
| 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |
| (In millions) |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax and noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 1.7 |  |  | $ | 1.6 |  |  | $ | 1.7 |  |  | $ | 1.7 |
Other comprehensive loss – unrealized losses arising during the period |  | — |  |  |  | — |  |  |  | — |  |  |  | (.1 | )
Balance at end of period | $ | 1.7 |  |  | $ | 1.6 |  |  | $ | 1.7 |  |  | $ | 1.6 |
Interest rate swap: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (.8 | ) |  | $ | — |  |  | $ | (1.2 | ) |  | $ | — |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses arising during the year |  | (.5 | ) |  |  | — |  |  |  | (.5 | ) |  |  | — |
Less reclassification adjustment for amounts included in interest expense |  | .2 |  |  |  | — |  |  |  | .6 |  |  |  | — |
Balance at end of period | $ | (1.1 | ) |  | $ | — |  |  | $ | (1.1 | ) |  | $ | — |
Currency translation adjustment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (83.1 | ) |  | $ | (46.9 | ) |  | $ | (88.5 | ) |  | $ | (54.1 | )
Other comprehensive income (loss) |  | 9.3 |  |  |  | (16.7 | ) |  |  | 14.7 |  |  |  | (9.5 | )
Balance at end of period | $ | (73.8 | ) |  | $ | (63.6 | ) |  | $ | (73.8 | ) |  | $ | (63.6 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (135.0 | ) |  | $ | (127.1 | ) |  | $ | (137.0 | ) |  | $ | (129.0 | )
Other comprehensive income— amortization of prior service cost and net losses included in net periodic pension cost |  | .6 |  |  |  | 1.9 |  |  |  | 2.6 |  |  |  | 3.8 |
Balance at end of period | $ | (134.4 | ) |  | $ | (125.2 | ) |  | $ | (134.4 | ) |  | $ | (125.2 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 2.9 |  |  | $ | 2.2 |  |  | $ | 3.1 |  |  | $ | 2.4 |
Other comprehensive loss – amortization of prior service credit |  | (.2 | ) |  |  | (.2 | ) |  |  | (.4 | ) |  |  | (.4 | )
Balance at end of period | $ | 2.7 |  |  | $ | 2.0 |  |  | $ | 2.7 |  |  | $ | 2.0 |
Total accumulated other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (214.3 | ) |  | $ | (170.2 | ) |  | $ | (221.9 | ) |  | $ | (179.0 | )
Other comprehensive income (loss) |  | 9.4 |  |  |  | (15.0 | ) |  |  | 17.0 |  |  |  | (6.2 | )
Balance at end of period | $ | (204.9 | ) |  | $ | (185.2 | ) |  | $ | (204.9 | ) |  | $ | (185.2 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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