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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 95.1 | $ 12.9 | $ (37.5)
Kronos Worldwide, Inc. |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 69.3 | 8.3 | (34.3)
NL Industries |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 19.7 | 2.6 | (4.0)
CompX International |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 1.7 | 1.4 | 1.2
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 3.2 | (0.4) | 0.1
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 1.2 | $ 1.0 | $ (0.5)

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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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