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Investment in TiO2 Manufacturing Joint Venture and Other Assets - Other Noncurrent Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Other assets:    
Land held for development $ 125.3 $ 129.2
Operating lease right-of-use assets 29.0  
Restricted cash and cash equivalents 33.0 8.9
Land contract receivables   9.1
IBNR receivables 8.5 6.0
Note receivables - OPA 8.8 1.9
Other 11.9 12.7
Total $ 216.5 $ 167.8