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Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Subsidiaries (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 335.9 | $ 358.1
Kronos Worldwide, Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 239.1 | 267.0
NL |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 83.3 | 77.8
CompX |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 13.5 | $ 13.3

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