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Investment in TiO2 Manufacturing Joint Venture and Other Assets - Components of Net Distributions from LPC (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary Of Investment Holdings [Line Items] |  |  |
Net distributions | $ 6.5 | $ 10.6 | $ 10.9
LPC |  |  |
Summary Of Investment Holdings [Line Items] |  |  |
Distributions from LPC | 48.2 | 48.0 | 70.7
Contributions to LPC | (41.7) | (37.4) | (59.8)
Net distributions | $ 6.5 | $ 10.6 | $ 10.9

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