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Valhi stockholder's equity - Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Marketable securities, Balance at beginning of year | $ 6.4 | $ 14.6 | $ 9.0
Balance at beginning of year | (23.3) | 21.2 | (3.2)
Marketable securities, Unrealized gain (loss) arising during the year | 4.1 | (8.2) | 5.6
Other comprehensive income (loss) | (18.7) | (44.5) | 4.6
Common stock sale | (8.4) |  |
Marketable securities, Balance at end of year | 2.1 | 6.4 | 14.6
Currency translation, Balance at beginning of year | 37.5 | 59.2 | 50.3
Currency translation, Arising during the year | 23.0 | (21.7) | (0.1)
Currency translation, Common stock sale | (7.2) |  |
Currency translation, Balance at end of year | 53.3 | 37.5 | 59.2
Balance at end of year | (42.0) | (23.3) | 21.2
Pension Plan Defined Benefit [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | (72.6) | (59.8) |
Balance at beginning of year | (72.6) | (59.8) | (66.1)
Amortization of prior service cost and net losses included in net periodic pension cost | 6.1 | 4.0 | 4.2
Net actuarial loss arising during year | (35.0) | (16.8) | (6.5)
Plan amendment |  |  | (2.0)
Balance at end of year | (101.5) | (72.6) | (59.8)
OPEB [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Balance at beginning of year | 5.4 | 7.2 | 3.6
Amortization of prior service cost and net losses included in net periodic pension cost | (1.0) | (0.5) | (0.4)
Net actuarial loss arising during year | (0.3) | (1.3) | (1.3)
Plan amendment |  |  | 5.1
Balance at end of year | 4.1 | 5.4 | 7.2
Kronos Worldwide, Inc. [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Common stock sale |  |  | 19.8
Currency translation, Common stock sale |  |  | 9.0
Kronos Worldwide, Inc. [Member] | Pension Plan Defined Benefit [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Common stock sale |  |  | 10.6
Kronos Worldwide, Inc. [Member] | OPEB [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Common stock sale |  |  | $ 0.2

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