Other Income, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disclosure Other Income Net Additional Information Detail [Line Items]
Infrastructure reimbursement	$ 6.2	$ 19.1
Kronos Worldwide, Inc.
Disclosure Other Income Net Additional Information Detail [Line Items]
Gain on insurance settlement related to property damage claim		1.5
City Of Henderson
Disclosure Other Income Net Additional Information Detail [Line Items]
Infrastructure reimbursement	$ 6.2	$ 19.1