Investment in TiO2 Manufacturing Joint Venture and Other Assets - Summary of Financial Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Information [Line Items]
Current assets	$ 1,673.2	$ 1,453.4
Property and equipment, net	563.6	590.4	$ 563.0
Total assets	3,005.2	2,889.3	2,794.4
Other liabilities, primarily current	57.9	39.4
Total liabilities and equity	3,005.2	2,889.3
Net sales	2,335.4	1,878.1	1,938.4
Cost of sales	1,716.2	1,437.6	1,462.9
General and administrative	311.9	283.6	294.2
Total costs and expenses	2,077.6	1,777.5	1,833.7
Net income	197.7	89.0	78.2
LPC
Financial Information [Line Items]
Current assets	111.7	105.8
Property and equipment, net	142.6	134.1
Total assets	254.3	239.9
Other liabilities, primarily current	47.8	30.6
Partners' equity	206.5	209.3
Total liabilities and equity	254.3	239.9
Net sales	378.2	336.1	353.2
Cost of sales	377.8	335.7	352.8
General and administrative	0.4	0.4	0.4
Total costs and expenses	378.2	336.1	353.2
LPC | Kronos Worldwide, Inc.
Financial Information [Line Items]
Net sales	188.6	167.8	176.2
LPC | Venator Investments LLC
Financial Information [Line Items]
Net sales	$ 189.6	$ 168.3	$ 177.0