Investment in TiO2 Manufacturing Joint Venture and Other Assets - Investment in TiO2 Manufacturing Joint Venture and Other Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Other assets:
Land held for development	$ 129.2	$ 126.6
Restricted cash and cash equivalents	8.9	9.9
Land contract receivables	9.1
IBNR receivables	6.0	6.8
Note receivables - OPA	1.9
Other	12.7	26.6
Total	$ 167.8	$ 169.9

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