Investment in TiO2 Manufacturing Joint Venture and Other Assets - Schedule of Maturities of Operating Lease Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Gross amounts due each year:
2024	$ 4.6
2025	3.6
2026	3.3
2027	2.2
2028	2.0
2029 and thereafter	17.0
Total remaining lease payments	32.7
Less imputed interest	10.2
Total lease obligations	22.5
Less current obligations	$ 3.9	$ 3.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Operating lease liabilities	$ 18.6	$ 17.4
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities