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Other assets - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease expense |  |  |  |  |  |  | $ 5.2 | $ 5.6 | $ 5.5 |
Operating lease, right-of-use asset | $ 2.8 |  | $ 4.6 |  | $ 6.6 |  | $ 2.8 | $ 4.6 | 6.6 |
Weighted average remaining lease term | 14 years |  | 14 years |  |  |  | 14 years | 14 years |  |
Weighted average discount rate associated with leases | 6.00% |  | 5.00% |  |  |  | 6.00% | 5.00% |  |
Operating lease not yet commenced, description |  |  |  |  |  |  | At December 31, 2024, we have no significant lease commitments that have not yet commenced. |  |  |
Infrastructure reimbursement |  |  |  |  |  |  | $ 31.7 | $ 25.5 | 16.0 |
Additional term for redevelopment plan |  |  |  |  |  |  |  |  |  | 15 years
Operating lease liability | $ 20.6 |  |  |  |  |  | $ 20.6 |  |  |
City of Henderson Redevelopment Agency | Tax Increment Reimbursement, Quarter Three |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Infrastructure reimbursement |  | $ 14.2 |  | $ 4.8 |  | $ 10.0 |  |  |  |
City of Henderson Redevelopment Agency | Tax Increment Reimbursement, Quarter Four |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Infrastructure reimbursement | 16.1 |  | $ 20.4 |  | $ 5.2 |  |  |  |  |
City Of Henderson |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  | 6.00% |  |  |
OPA | City of Henderson Redevelopment Agency |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Tax increment reimbursement percentage |  |  |  |  |  |  | 75.00% |  |  |
OPA | City of Henderson Redevelopment Agency | OtherIncome |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Infrastructure reimbursement |  |  |  |  |  |  | $ 30.3 | $ 25.2 | $ 15.2 |
OPA | Maximum | City of Henderson Redevelopment Agency |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Reimbursement revenue | 209.0 |  |  |  |  |  | 209.0 |  |  |
Leverkusen TiO2 production facility | Chemicals |  |  |  |  |  |  |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease liability | $ 6.8 |  |  |  |  |  | $ 6.8 |  |  |

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