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Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 297.7 | $ 243.5
Kronos Worldwide, Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 178.8 | 134.5
NL Industries |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 53.0 | 44.3
CompX International |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 17.0 | 16.4
BMI |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 24.8 | 24.6
LandWell |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 24.1 | $ 23.7

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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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