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Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 362.4	$ 342.3
Kronos Worldwide, Inc.
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	217.5	204.9
NL Industries
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	74.1	71.1
CompX International
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	18.2	17.8
BMI
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	27.5	26.0
LandWell
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 25.1	$ 22.5

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(22))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(24))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- References

No definition available.

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- Details

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- Details

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- Details

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- Details

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- Details

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