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Investment in TiO2 Manufacturing Joint Venture and Other Assets - Investment in TiO2 Manufacturing Joint Venture and Other Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Other assets: |  |
Land held for development | $ 126.6 | $ 138.1
Restricted cash equivalents | 9.9 | 2.6
IBNR receivables | 6.8 | 7.1
Other | 26.6 | 16.9
Total | $ 169.9 | $ 164.7

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