Related Party Transactions - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contran \| Intercorporate Services Agreements Fees
Related Party Transaction [Line Items]
Related party transaction	$ 41.0	$ 41.3	$ 43.9
Contran \| Combined Information Technology Data Recovery Program
Related Party Transaction [Line Items]
Related party transaction	0.3	0.3	0.2
Contran \| Pledge Fee Received
Related Party Transaction [Line Items]
Revenue and other income from related party transactions	1.5	1.4	1.9
Contran \| Kronos Worldwide, Inc. \| Sublease Agreement
Related Party Transaction [Line Items]
Payment for sublease rent and related ancillary services	$ 0.4	0.4	0.1
Contran \| Kronos Worldwide, Inc. \| Stock Pledged as Collateral
Related Party Transaction [Line Items]
Stock pledged as collateral	16.7
Contran \| Contran Credit Facility
Related Party Transaction [Line Items]
Interest on borrowings and unused commitment fees under credit facilities	$ 10.4	14.2	19.9
Contran and Other Affiliates
Related Party Transaction [Line Items]
Related party transaction cash received for insurance premium			0.7
Related party transaction cash paid for insurance premium	27.1	23.1
LPC
Related Party Transaction [Line Items]
Purchase of Ti02 from LPC	188.6	167.8	176.2
Sales of feedstock ore to LPC	$ 85.4	$ 84.2	$ 84.1

Balance held at close of period in number of shares.

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