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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 27, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Income tax examination, description |  |  |  |  | Tax authorities are examining certain of our U.S. and non-U.S. tax returns and have or may propose tax deficiencies, including penalties and interest. Because of the inherent uncertainties involved in settlement initiatives and court and tax proceedings, we cannot guarantee that these tax matters, if any, will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. |  |  |
Income tax expense (benefit) |  |  |  |  | $ 60.1 | $ 15.9 | $ 26.5 |
Business interest income, adjusted taxable income | 30.00% |  |  |  |  |  |  |
Current income taxes expense (benefit) |  |  |  |  | 51.2 | 28.2 | 26.3 |
Deferred income taxes expense (benefit) |  |  |  |  | 8.9 | (12.3) | 0.2 |
Deferred income tax benefit from change in enacted tax rate |  |  |  |  |  | (0.2) | 4.7 |
Deferred income taxes |  |  |  |  | 46.2 | 29.6 |  |
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 |  |  |  |  | 6.6 |  |  |
Increase (decrease) in unrecognized tax benefits |  |  |  |  | 3.5 |  |  |
Accrued interest and penalties during the period |  |  |  |  | 0.7 | 0.8 | 1.3 |
Accrued interest and penalties end of the period |  |  |  |  | 0.9 | 1.3 |  |
Contran |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Income taxes payable current |  |  |  |  | 1.5 | 8.3 |  |
Income taxes payable noncurrent |  |  |  |  | $ 44.5 | 50.4 |  |
Germany |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 3.0 |  |  |  |  |
Current income taxes expense (benefit) |  |  | 1.5 |  |  |  |  |
Deferred income taxes expense (benefit) |  |  | 1.5 |  |  |  |  |
Deferred income tax benefit from change in enacted tax rate |  |  | $ 4.7 |  |  |  |  |
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 |  |  |  |  | $ 50.4 |  |  |
European Subsidiaries | Chemicals | Transition Tax | Contran |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Income taxes payable current |  |  |  |  | 5.9 |  |  |
Income taxes payable noncurrent |  |  |  |  | 44.5 |  |  |
European Subsidiaries | Chemicals | Income Tax Payable | Transition Tax | Contran |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Current income tax expense payable in increments over remainder of eight year period |  |  |  |  | 50.4 |  |  |
Corporate Tax Purposes | Kronos Worldwide, Inc. | Germany | Chemicals |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | 451.0 |  |  |
Corporate Tax Purposes | Kronos Worldwide, Inc. | Belgium | Chemicals |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  | 19.0 |  |  |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  |  |  | 5.0 | $ (2.4) | $ 0.1 |
Deferred income taxes |  |  |  |  | 45.4 |  |  |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. | Maximum |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  | $ 155.4 |  |  |

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