Investment in TiO2 Manufacturing Joint Venture - Summary of Income Statements of LPC (Detail) - Louisiana Pigment Company, L.P. - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues and other income:
Total revenues and other income	$ 332.9	$ 315.8	$ 315.4
Cost and expenses:
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
Kronos
Revenues and other income:
Total revenues and other income	165.9	157.5	157.5
Venator Investments
Revenues and other income:
Total revenues and other income	$ 167.0	$ 158.3	$ 157.9