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Related Party Transactions - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contran | Intercorporate Services Agreements Fees
Related Party Transaction [Line Items]
Related party transaction	$ 43.9	$ 39.6	$ 40.0
Contran | Combined Information Technology Data Recovery Program
Related Party Transaction [Line Items]
Related party transaction	0.2	0.3	0.3
Contran | Pledge Fee Received
Related Party Transaction [Line Items]
Revenue and other income from related party transactions	1.9	3.1	2.8
Contran | Tremont | Deferred Payment | Present Value
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure	9.9
Contran | Tremont | Deferred Payment | Face Value
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure	11.1
Contran | Tremont | Promissory Notes
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure	2.0
Contran | Kronos Worldwide, Inc. | Sublease Agreement
Related Party Transaction [Line Items]
Payment for sublease rent and related ancillary services	$ 0.1
Contran | Kronos Worldwide, Inc. | Stock Pledged as Collateral
Related Party Transaction [Line Items]
Stock pledged as collateral	25.0
Contran | Revolving Credit Facility
Related Party Transaction [Line Items]
Interest on borrowings and unused commitment fees under credit facilities	$ 19.9	18.9	14.6
Contran and Other Affiliates
Related Party Transaction [Line Items]
Related party transaction cash received for insurance premium	0.7	5.4	5.9
LPC
Related Party Transaction [Line Items]
Purchase of Ti02 from LPC	176.2	165.9	157.5
Sales of feedstock ore to LPC	$ 84.1	$ 66.9	$ 79.4

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