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Related party transactions - Additional Information (Detail) € in Millions, shares in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 12, 2024 USD ($) | Feb. 12, 2024 EUR (€) | Feb. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Kronos | Subordinated, unsecured term loan from Contran |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Subordinated, Unsecured Term Loan from Contran | $ 53.7 | € 50.0 |  |  |  |
Contran | Intercorporate Services Agreements Fees |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction |  |  |  | $ 37.8 | $ 41.2 | $ 41.0
Contran | Combined Information Technology Data Recovery Program |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction |  |  |  | 0.4 | 0.3 | 0.3
Contran | Pledge Fee Received |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue and other income from related party transactions |  |  |  | 0.8 | 1.2 | 1.5
Contran | Kronos | Sublease Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Payment for sublease rent and related ancillary services |  |  |  | $ 0.6 | 0.5 | 0.4
Contran | Kronos | Stock Pledged as Collateral |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Stock pledged as collateral | shares |  |  |  | 16.7 |  |
Contran | Contran Credit Facility |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest on borrowings and unused commitment fees under credit facilities |  |  |  | $ 10.3 | 9.2 | 10.4
Contran and Other Affiliates |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction cash paid for insurance premium |  |  |  | 29.3 | 25.2 | 27.1
LPC |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchase of Ti02 from LPC |  |  |  | 231.7 | 225.6 | 188.6
Sales of feedstock ore to LPC |  |  |  | $ 135.1 | $ 106.9 | $ 85.4
Related Party [Member] | Kronos | Subordinated, unsecured term loan from Contran | Contran |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Subordinated, Unsecured Term Loan from Contran |  |  | $ 53.7 |  |  |

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