Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Contran \| Intercorporate Services Agreements Fees
Related Party Transaction [Line Items]
Related party transaction	$ 41.2	$ 41.0	$ 41.3
Contran \| Combined Information Technology Data Recovery Program
Related Party Transaction [Line Items]
Related party transaction	0.3	0.3	0.3
Contran \| Pledge Fee Received
Related Party Transaction [Line Items]
Revenue and other income from related party transactions	1.2	1.5	1.4
Contran \| Kronos \| Sublease Agreement
Related Party Transaction [Line Items]
Payment for sublease rent and related ancillary services	$ 0.5	0.4	0.4
Contran \| Kronos \| 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	$ 9.2	10.4	14.2
Contran and Other Affiliates
Related Party Transaction [Line Items]
Related party transaction cash paid for insurance premium	25.2	27.1	23.1
LPC
Related Party Transaction [Line Items]
Purchase of Ti02 from LPC	225.6	188.6	167.8
Sales of feedstock ore to LPC	$ 106.9	$ 85.4	$ 84.2

Balance held at close of period in number of shares.

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