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Noncontrolling interest in subsidiaries - Changes in Ownership Interest in Subsidiaries (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Noncontrolling Interest [Line Items] |  |  |  |
Net income attributable to Valhi stockholders | $ 22.9 | $ 71.5 | $ 156.2 | $ 161.9
Transfers from noncontrolling interest - |  |  |  |
Issuance of subsidiaries common stock |  |  |  | 0.4
Net income attributable to Valhi stockholders and change from noncontrolling interest in subsidiaries |  |  | $ 156.2 | $ 162.3

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