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Related Party Transactions - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contran | Intercorporate Services Agreements Fees |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | $ 41.3 | $ 43.9 | $ 39.6
Contran | Combined Information Technology Data Recovery Program |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 0.3 | 0.2 | 0.3
Contran | Pledge Fee Received |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue and other income from related party transactions | 1.4 | 1.9 | 3.1
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 | $ 0.4 | 0.1 |
Contran | Kronos Worldwide, Inc. | Stock Pledged as Collateral |  |  |
Related Party Transaction [Line Items] |  |  |
Stock pledged as collateral | 21.7 |  |
Contran | Revolving Credit Facility |  |  |
Related Party Transaction [Line Items] |  |  |
Interest on borrowings and unused commitment fees under credit facilities | $ 14.2 | 19.9 | 18.9
Contran and Other Affiliates |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction cash received for insurance premium |  | 0.7 | 5.4
Related party transaction cash paid for insurance premium | 23.1 |  |
LPC |  |  |
Related Party Transaction [Line Items] |  |  |
Purchase of Ti02 from LPC | 167.8 | 176.2 | 165.9
Sales of feedstock ore to LPC | $ 84.2 | $ 84.1 | $ 66.9

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