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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Changes in accumulated other comprehensive loss attributable to Valhi stockholders for the three and nine months ended September 30, 2016 and 2017 are presented in the table below.
| Three months ended September 30, |  |  | Nine months ended September 30, |
| 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |
| (In millions) |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax and noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 1.7 |  |  | $ | 1.7 |  |  | $ | 1.6 |  |  | $ | 1.7 |
Other comprehensive income– unrealized gains arising during the period |  | — |  |  |  | — |  |  |  | .1 |  |  |  | — |
Balance at end of period | $ | 1.7 |  |  | $ | 1.7 |  |  | $ | 1.7 |  |  | $ | 1.7 |
Interest rate swap: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (3.5 | ) |  | $ | (1.1 | ) |  | $ | (1.3 | ) |  | $ | (1.2 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) arising during the year |  | .1 |  |  |  | (.7 | ) |  |  | (2.7 | ) |  |  | (1.2 | )
Less reclassification adjustment for amounts included in interest expense |  | .4 |  |  |  | 1.8 |  |  |  | 1.0 |  |  |  | 2.4 |
Balance at end of period | $ | (3.0 | ) |  | $ | — |  |  | $ | (3.0 | ) |  | $ | — |
Currency translation adjustment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (72.4 | ) |  | $ | (73.8 | ) |  | $ | (78.1 | ) |  | $ | (88.5 | )
Other comprehensive income |  | 5.4 |  |  |  | 19.3 |  |  |  | 11.1 |  |  |  | 34.0 |
Balance at end of period | $ | (67.0 | ) |  | $ | (54.5 | ) |  | $ | (67.0 | ) |  | $ | (54.5 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (119.3 | ) |  | $ | (134.4 | ) |  | $ | (123.0 | ) |  | $ | (137.0 | )
Other comprehensive income— amortization of prior service cost and net losses included in net periodic pension cost |  | 1.9 |  |  |  | 1.8 |  |  |  | 5.6 |  |  |  | 4.4 |
Balance at end of period | $ | (117.4 | ) |  | $ | (132.6 | ) |  | $ | (117.4 | ) |  | $ | (132.6 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 3.3 |  |  | $ | 2.7 |  |  | $ | 3.8 |  |  | $ | 3.1 |
Other comprehensive loss – amortization of prior service credit |  | (.3 | ) |  |  | (.2 | ) |  |  | (.8 | ) |  |  | (.6 | )
Balance at end of period | $ | 3.0 |  |  | $ | 2.5 |  |  | $ | 3.0 |  |  | $ | 2.5 |
Total accumulated other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (190.2 | ) |  | $ | (204.9 | ) |  | $ | (197.0 | ) |  | $ | (221.9 | )
Other comprehensive income |  | 7.5 |  |  |  | 22.0 |  |  |  | 14.3 |  |  |  | 39.0 |
Balance at end of period | $ | (182.7 | ) |  | $ | (182.9 | ) |  | $ | (182.7 | ) |  | $ | (182.9 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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