Other income, net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other income, net [Line Items]
Infrastructure reimbursement	$ 31.7	$ 25.5	$ 16.0
Insurance recoveries	1.4	3.0	2.8
Net proceeds	5.6	1.8
Pre-tax gain on sale of land	0.5	1.5
Kronos Worldwide
Other income, net [Line Items]
Insurance recoveries		2.5	2.7
LandWell
Other income, net [Line Items]
Infrastructure reimbursement	1.4	0.3	0.8
NL Industries
Other income, net [Line Items]
Insurance recoveries	$ 1.4	$ 0.5	$ 0.1