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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 6.0 | $ (1.6) | $ 4.3 | $ (31.7)
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 3.8 | (30.2)
NL Industries |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 1.0 | (3.1)
CompX International |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 1.0 | 1.0
BMI |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | (1.2) | 0.4
LandWell |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | $ (0.3) | $ 0.2

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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 + Details
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