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Noncontrolling Interest in subsidiaries - Noncontrolling Interest in Subsidiaries (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Noncontrolling Interest In Subsidiaries
Noncontrolling interest in subsidiaries	$ 367.5	$ 335.8
Kronos [Member]
Noncontrolling Interest In Subsidiaries
Noncontrolling interest in subsidiaries	277.5	240.2
NL Industries Inc [Member]
Noncontrolling Interest In Subsidiaries
Noncontrolling interest in subsidiaries	78.6	84.6
CompX [Member]
Noncontrolling Interest In Subsidiaries
Noncontrolling interest in subsidiaries	$ 11.4	$ 11.0

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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