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Valhi Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders Equity Note [Abstract] |
Schedule of Common Stock Outstanding |
|  | Shares of common stock |
|  | Issued |  |  | Treasury |  |  | Outstanding |
|  | (In millions) |
Balance at December 31, 2015, 2016 and 2017 |  |  | 355.3 |  |  |  | (13.2 | ) |  |  | 342.0 |
Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) attributable to Valhi stockholders comprises changes in equity as presented in the table below.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 1.7 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain arising during the year |  |  | — |  |  |  | .1 |  |  |  | — |
Balance at end of year |  | $ | 1.6 |  |  | $ | 1.7 |  |  | $ | 1.7 |
Interest rate swap: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | — |  |  | $ | (1.3 | ) |  | $ | (1.2 | )
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses during the year |  |  | (1.7 | ) |  |  | (1.2 | ) |  |  | (1.2 | )
Less reclassification adjustments for amounts included in interest expense |  |  | .4 |  |  |  | 1.3 |  |  |  | 2.4 |
Balance at end of year |  | $ | (1.3 | ) |  | $ | (1.2 | ) |  | $ | — |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | (22.6 | ) |  | $ | (78.1 | ) |  | $ | (88.5 | )
Other comprehensive gain (loss) arising during the year |  |  | (55.5 | ) |  |  | (10.4 | ) |  |  | 34.4 |
Balance at end of year |  | $ | (78.1 | ) |  | $ | (88.5 | ) |  | $ | (54.1 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | (132.0 | ) |  | $ | (123.0 | ) |  | $ | (137.0 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net (gains) losses included in net periodic pension cost |  |  | 6.7 |  |  |  | 5.7 |  |  |  | 6.4 |
Net actuarial gain (loss) arising during the year |  |  | 2.3 |  |  |  | (19.7 | ) |  |  | 1.6 |
Balance at end of year |  | $ | (123.0 | ) |  | $ | (137.0 | ) |  | $ | (129.0 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 4.4 |  |  | $ | 3.8 |  |  | $ | 3.1 |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost |  |  | (1.0 | ) |  |  | (1.0 | ) |  |  | (.8 | )
Net actuarial gain arising during the year |  |  | .4 |  |  |  | .3 |  |  |  | .1 |
Balance at end of year |  | $ | 3.8 |  |  | $ | 3.1 |  |  | $ | 2.4 |
Total accumulated other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | (148.6 | ) |  | $ | (197.0 | ) |  | $ | (221.9 | )
Other comprehensive income (loss) |  |  | (48.4 | ) |  |  | (24.9 | ) |  |  | 42.9 |
Balance at end of year |  | $ | (197.0 | ) |  | $ | (221.9 | ) |  | $ | (179.0 | )

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