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Noncontrolling Interest in subsidiaries - Noncontrolling Interest in Subsidiaries (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 358.1	$ 335.8
Kronos Worldwide, Inc. [Member]
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	267.0	240.2
NL [Member]
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	77.8	84.6
CompX [Member]
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 13.3	$ 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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