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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 | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ (35.5) | $ 8.2 | $ (30.1) | $ 12.0
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | (27.8) | 9.1
NL |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | (3.3) | 1.6
CompX |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 0.7 | 0.6
BMI |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | $ 0.3 | 0.3
LandWell |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  |  | $ 0.4

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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=35736750&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 -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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