Investment in TiO2 Manufacturing Joint Venture and Other Assets - Investment in TiO2 Manufacturing Joint Venture and Other Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Other assets:
Land held for development	$ 157.2	$ 165.1
Waste disposal site operating permits, net	48.1	53.2
Restricted cash	19.6	13.9
IBNR receivables	7.0	6.8
Capital lease deposit	6.2	6.2
Intangible assets	5.1	5.1
Other	11.8	27.5
Total	255.0	277.8
Capitalized Operating Permits
Other assets:
Waste disposal site operating permits, net	$ 48.1	$ 53.2

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