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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Noncontrolling interest in net income of subsidiaries: |  |
Noncontrolling interest in net income of subsidiaries | $ 18.5 | $ 9.1
Kronos Worldwide, Inc. |  |
Noncontrolling interest in net income of subsidiaries: |  |
Noncontrolling interest in net income of subsidiaries | 13.8 | 7.2
NL Industries |  |
Noncontrolling interest in net income of subsidiaries: |  |
Noncontrolling interest in net income of subsidiaries | 2.4 | 1.4
CompX International |  |
Noncontrolling interest in net income of subsidiaries: |  |
Noncontrolling interest in net income of subsidiaries | 0.5 | 0.4
BMI |  |
Noncontrolling interest in net income of subsidiaries: |  |
Noncontrolling interest in net income of subsidiaries | 0.6 |
LandWell |  |
Noncontrolling interest in net income of subsidiaries: |  |
Noncontrolling interest in net income of subsidiaries | $ 1.2 | $ 0.1

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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=84234705&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=84161450&loc=SL4573702-111684 + Details
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