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Income taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 27, 2020 | Mar. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Income tax expense |  |  |  | $ 33.8 | $ 60.1 | $ 15.9 |
Business interest income, adjusted taxable income | 30.00% |  |  | 30.00% |  |  |
Current income taxes expense (benefit) |  |  |  | $ 36.4 | 51.2 | 28.2 |
Deferred income taxes expense (benefit) |  |  |  | (2.6) | 8.9 | (12.3) |
Deferred income tax benefit from change in enacted tax rate |  |  |  |  |  | (0.2) |
Deferred income taxes |  |  |  | 63.5 | 46.2 |  |
CARES act of 2020, Business interest income, adjusted taxable income | 50.00% |  |  |  |  |  |
Cash tax benefit recognized |  | $ 1.0 |  |  |  |  |
Unrecognized tax benefits impact on effective tax rate |  |  |  | 3.5 |  |  |
Increase (decrease) in unrecognized tax benefits |  |  |  | 1.2 |  |  |
Accrued interest and penalties during the period |  |  |  | 0.2 | 0.7 | 0.8 |
Accrued interest and penalties end of the period |  |  |  | 0.1 | 0.9 |  |
Contran |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Income taxes payable current |  |  |  | 5.8 | 1.5 |  |
Income taxes payable noncurrent |  |  |  | $ 33.4 | 44.5 |  |
European Subsidiaries | Chemicals | Transition Tax |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Current income tax expense provisional pursuant to transition tax |  |  | $ 74.1 |  |  |  |
Income tax liability payable period |  |  |  | 8 years |  |  | 8 years
Payable to affiliate |  |  |  | $ 44.5 |  |  |
European Subsidiaries | Chemicals | Transition Tax | Contran |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Income taxes payable current |  |  |  | 11.1 |  |  |
Income taxes payable noncurrent |  |  |  | 33.4 |  |  |
European Subsidiaries | Chemicals | Income Taxes Payables [Member] | Transition Tax | Contran |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Current income tax expense payable in increments over remainder of eight year period |  |  |  | 44.5 |  |  |
Corporate Tax Purposes | Kronos | Germany | Chemicals |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 414.0 |  |  |
Corporate Tax Purposes | Kronos | Belgium | Chemicals |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 13.0 |  |  |
Direct Investment in Subsidiary | Kronos |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  |  | 1.2 | $ (5.0) | $ 2.4 |
Deferred income taxes |  |  |  | 55.0 |  |  |
Direct Investment in Subsidiary | Kronos | Maximum [Member] |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Deferred income taxes |  |  |  | $ 155.4 |  |  |

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