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Accumulated other comprehensive loss (Tables) | 3 Months Ended
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Mar. 31, 2013
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Schedule of Changes in Accumulated Other Comprehensive Income | Changes in accumulated other comprehensive loss attributable to Valhi stockholders for the three months ended March 31, 2012 and 2013 are presented in the table below, net of related deferred income taxes.
|  | Three months ended March 31, |
|  | 2012 |  |  | 2013 |
|  | (In millions) |
Accumulated other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 6.4 |  |  | $ | 2.1 |
Other comprehensive loss – unrealized losses during the year |  |  | (5.2 | ) |  |  | (.2 | )
Balance at end of period |  | $ | 1.2 |  |  | $ | 1.9 |
Currency translation adjustment: |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 37.5 |  |  | $ | 53.3 |
Other comprehensive income (loss) |  |  | 14.1 |  |  |  | (21.5 | )
Balance at end of period |  | $ | 51.6 |  |  | $ | 31.8 |
Defined benefit pension plans: |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | (72.6 | ) |  | $ | (101.5 | )
Other comprehensive income – amortization of prior service cost and net losses included in net periodic pension cost |  |  | 1.5 |  |  |  | 2.1 |
Balance at end of period |  | $ | (71.1 | ) |  | $ | (99.4 | )
OPEB plans: |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 5.4 |  |  | $ | 4.1 |
Other comprehensive loss – amortization of prior service credit |  |  | (.3 | ) |  |  | (.3 | )
Balance at end of period |  | $ | 5.1 |  |  | $ | 3.8 |
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (23.3 | ) |  | $ | (42.0 | )
Other comprehensive income (loss) |  |  | 10.1 |  |  |  | (19.9 | )
Balance at end of period |  | $ | (13.2 | ) |  | $ | (61.9 | )

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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=20435746&loc=SL7669686-108580 + Details
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