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Income Taxes - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2018 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 CAD ($)
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% |
Income tax examination, description |  |  |  |  |  |  |  |  |  |  |  |  |  | Tax authorities may in the future examine 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 will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. |  |  |
Deferred income tax benefit from change in enacted tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 77,100,000 |  |  |
Current income tax expense provisional pursuant to transition tax |  |  | $ 76,200,000 |  |  |  |  |  |  |  |  |  |  | 76,200,000 |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | (205,400,000) | $ (2,200,000) | $ 159,000,000 |
Income taxes | $ 5,100,000 |  | 25,100,000 |  |  | $ 5,100,000 |  |  |  | $ 25,100,000 |  |  |  | 25,100,000 | 5,100,000 |  |
Non-cash income tax benefit related to reversal of reserve for uncertain tax positions |  |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  | (245,800,000) | (26,400,000) | 89,100,000 |
Unrecognized tax benefits impact on effective tax rate |  |  | 13,100,000 |  |  |  |  |  |  | 13,100,000 |  |  |  | 13,100,000 |  |  |
Increase (decrease) in unrecognized tax benefits |  |  | 1,800,000 |  |  |  |  |  |  | 1,800,000 |  |  |  | 1,800,000 |  |  |
Accrued interest and penalties during the period |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | 1,600,000 | $ 1,300,000 |
Accrued interest and penalties end of the period | 5,200,000 |  | 1,500,000 |  |  | 5,200,000 |  |  |  | 1,500,000 |  |  |  | $ 1,500,000 | 5,200,000 |  |
US-Canada APA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current U.S. income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,400,000) |  |
Canada - Germany APA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S.-Canada Advance Pricing Agreement, description |  |  |  |  |  |  |  |  |  |  |  |  |  | During the third quarter of 2017, our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (the “Canada-Germany APA”) effective for tax years 2005 - 2017. Pursuant to the terms of the Canada-Germany APA, the Canadian and German tax authorities agreed to certain prior year changes to taxable income of our Canadian and German subsidiaries. |  |  |
Non-cash income tax benefit related to reversal of reserve for uncertain tax positions |  |  |  | $ 8,100,000 |  |  |  |  |  |  |  |  |  | $ 8,600,000 |  |  |
Canada - Germany APA | Earliest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  |  |  |  |  |  | 2005 |  |  |
Canada - Germany APA | Latest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  |  |  |  |  |  | 2017 |  |  |
Scenario Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  |  |  |
Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  | $ (149,900,000) |  |  |  |  |  |  |  |  |  |  |  |
Effect of Currency Exchange Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,700,000 |  |  |
Transition Tax | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of annual usage limitation on net operating loss carryforward |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Germany | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  | (141,900,000) |  |  |  |  |  |  |  |  |  |  |  |
Belgium | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  | (8,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Germany and Belgian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (186,700,000) |  |  |
Germany and Belgian | Current Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  | (24,100,000) | $ (12,700,000) |  |  |  |  |  |
One Non-U.S. subsidiary | Expected Future Periods Net Operating Loss Utilization | Valuation Allowance of Deferred Tax Assets | Non Cash Deferred Income Tax Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  | (18,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | US-Canada APA | Earliest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2005 |  |
Kronos Worldwide, Inc. | US-Canada APA | Latest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2015 |  |
Kronos Worldwide, Inc. | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance | (173,000,000) |  |  |  | $ (149,900,000) |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Germany | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance | (153,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Belgium | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance | (20,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Germany and Belgian | Current Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  | $ 150,300,000 |  |  |  |  |  |  |  |  | $ (12,700,000) | $ 8,700,000 |  |  | $ (2,200,000) |  |
European Subsidiaries | Transition Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current income tax expense provisional pursuant to transition tax |  |  | 76,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax liability payable period |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |
European Subsidiaries | Transition Tax | Income Tax Payable | Contran |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current income tax expense payable in increments over remainder of eight year period |  |  | 70,100,000 |  |  |  |  |  |  | 70,100,000 |  |  |  | $ 70,100,000 |  |  |
European Subsidiaries | Transition Tax | Income Tax Receivable | Contran |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current income tax expense payable in next fiscal year |  |  | 6,100,000 |  |  |  |  |  |  | 6,100,000 |  |  |  | 6,100,000 |  |  |
European and Canadian Subsidiaries | Undistributed Earnings Previously Considered to be Permanently Reinvested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate provisional non-cash deferred income tax expense (benefit) |  |  | 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kronos Canadian Subsidiary | US-Canada APA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes | $ 2,300,000 |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  | 2,300,000 |  | $ 3
Corporate Tax Purposes | Kronos Worldwide, Inc. | Germany |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 652,000,000 |  |  |  |  |  |  | 652,000,000 |  |  |  | 652,000,000 |  |  |
Corporate Tax Purposes | Kronos Worldwide, Inc. | Belgium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 50,000,000 |  |  |  |  |  |  | 50,000,000 |  |  |  | 50,000,000 |  |  |
Trade Tax Purposes | Kronos Worldwide, Inc. | Germany |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 500,000 |  |  |  |  |  |  | 500,000 |  |  |  | 500,000 |  |  |
Canada Revenue Agency and German Federal Central Tax Office | Germany | Canada - Germany APA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash income tax benefit related to increase in German NOLs |  |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash tax refund |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Direct investment in subsidiary excess carrying amount | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  |  |  |  |  | $ (29,300,000) | $ (29,300,000) | $ (29,300,000) |  |  |  |  | 22,100,000 | $ 6,500,000 |  |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liability |  |  | 157,600,000 |  |  |  |  |  |  | 157,600,000 |  |  |  | 157,600,000 |  |  |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liability |  |  | $ 173,000,000 |  |  |  |  |  |  | $ 173,000,000 |  |  |  | $ 173,000,000 |  |  |

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