Investment in TiO2 Manufacturing Joint Venture and Other Assets - Summary of Financial Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Information [Line Items]
Current assets	$ 1,408.8	$ 1,262.2
Property and equipment, net	563.5	588.7	$ 516.0
Total assets	2,709.6	2,907.5	2,443.2
Other liabilities, primarily current	33.6	33.6
Total liabilities and equity	2,709.6	2,907.5
Net sales	1,889.3	1,904.6	1,558.4
Cost of sales	1,210.9	1,266.5	1,211.5
General and administrative	310.0	262.6	232.6
Total costs and expenses	1,653.1	1,612.8	1,518.8
Net income (loss)	301.0	302.6	(3.0)
LPC
Financial Information [Line Items]
Current assets	87.0	104.1
Property and equipment, net	119.6	116.1
Total assets	206.6	220.2
Other liabilities, primarily current	41.1	44.4
Partners’ equity	165.5	175.8
Total liabilities and equity	206.6	220.2
Net sales	332.9	315.8	315.4
Cost of sales	332.5	315.4	314.9
General and administrative	0.4	0.4	0.5
Total costs and expenses	332.9	315.8	315.4
Net income (loss)	0.0	0.0	0.0
LPC | Kronos Worldwide, Inc.
Financial Information [Line Items]
Net sales	165.9	157.5	157.5
Venator Materials PLC | Tioxide Group | Huntsman P&A Investments LLC
Financial Information [Line Items]
Net sales	$ 167.0	$ 158.3	$ 157.9