Other income, net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other income, net [Line Items]
Infrastructure reimbursement	$ 34.6	$ 31.7	$ 25.5
Insurance recoveries		1.4	3.0
Kronos Worldwide
Other income, net [Line Items]
Insurance recoveries			2.5
LandWell
Other income, net [Line Items]
Infrastructure reimbursement	0.4	1.4	0.3
NL Industries
Other income, net [Line Items]
Insurance recoveries	$ 0.0	$ 1.4	$ 0.5