Other Income, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disclosure Other Income Net Additional Information Detail [Line Items]
Infrastructure reimbursement	$ 19.1	$ 1.1
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	$ 1.1	$ 19.1