Investment in TiO2 Manufacturing Joint Venture - Components of Net Cash Distributions from (Contributions to) LPC (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Net distributions (contributions)	$ 3.1	$ (10.5)	$ 3.8
Louisiana pigment company, L.P
Schedule of Equity Method Investments [Line Items]
Distributions from LPC	52.8	58.3	28.5
Contributions to LPC	(49.7)	(68.8)	(24.7)
Net distributions (contributions)	$ 3.1	$ (10.5)	$ 3.8