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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% |
Deferred income tax benefit from change in enacted tax rate |  | $ (59.7) |  |  |  |  |  |  | $ (59.7) |  | $ 77.1
Adjustment of deferred income tax expense from change in enacted tax rate |  |  |  |  |  |  |  |  |  |  | 59.7
Current income tax expense provisional pursuant to transition tax |  | 2.1 |  |  |  |  |  |  | 2.1 |  |
Income tax expense (benefit) |  | (91.4) |  |  | $ 14.7 |  |  |  | (33.2) | $ (67.5) |
Provision for income taxes includes non-cash deferred income tax expense |  |  |  |  |  |  |  |  | $ 3.0 |  |
Business interest income, adjusted taxable income |  |  |  |  |  |  |  |  | 30.00% |  |
Effective state income tax rate |  | $ (3.4) |  |  |  |  |  |  | $ (3.4) |  |
Effective income tax rate |  | 38.00% |  |  |  |  |  |  | 38.90% |  |
Germany-Canada APA |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
U.S.-Canada Advance Pricing Agreement, description |  |  |  |  |  |  |  |  | During the third quarter of 2017, Kronos’ 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. |  |
Income tax expense (benefit) related to increase (decrease) in reserve for uncertain tax positions |  |  |  |  | 8.1 |  |  |  |  |  |
Increase (decrease) in unrecognized tax benefits |  | $ (1.8) |  |  |  |  |  |  | $ (1.8) |  |
Non-cash income tax benefit |  | 1.4 |  |  |  |  |  |  |  |  |
Earliest Tax Year | Germany-Canada APA |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  | 2005 |  |
Latest Tax Year | Germany-Canada APA |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  | 2017 |  |
Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  | $ (149.9) |  |  |
Effect of Currency Exchange Rates |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  |  | 13.7
Transition Tax | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of annual usage limitation on net operating loss carryforward |  |  |  |  |  |  |  |  | 80.00% |  |
Belgium | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  | (8.0) |  |  |
Germany and Belgian |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  |  | (186.7)
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 |  |  |  |  | (7.8) |  | $ (24.1) | (12.7) |  |  |
Germany | Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in non-cash deferred income tax asset valuation allowance |  |  |  |  |  |  |  | (141.9) |  |  |
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 |  |  |  |  |  | $ (7.7) |  | $ (12.7) |  |  |
European Subsidiaries | Transition Tax |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current income tax expense provisional pursuant to transition tax |  |  |  | $ 76.2 |  |  |  |  |  |  |
Income tax liability payable period |  |  |  | 8 years |  |  |  |  |  |  |
Income tax expense (benefit) |  | 2.1 |  |  |  |  |  |  |  |  |
Income tax liability payable period |  |  |  |  |  |  |  |  | 8 years |  |
Aggregate transition tax installments payments made |  | 10.6 |  |  |  |  |  |  | $ 10.6 |  |
Payable to affiliate |  | 63.5 |  |  |  |  |  |  | 63.5 |  |
European Subsidiaries | Transition Tax | 2017 Tax Year [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current income tax expense paid | $ 6.1 |  |  |  |  |  |  |  |  |  |
European Subsidiaries | Transition Tax | 2018 Tax Year [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current income tax expense paid |  | 4.5 | $ 4.5 |  |  |  |  |  |  |  |
European Subsidiaries | Transition Tax | Contran |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income taxes payable noncurrent |  | 57.8 |  |  |  |  |  |  | 57.8 |  |
Income taxes payable current |  | 5.7 |  |  |  |  |  |  | 5.7 |  |
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 |  | 63.5 |  |  |  |  |  |  | 63.5 |  |
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 |  |  |  | $ 5.3 |  |  |  |  | 3.2 |  |
Corporate Tax Purposes | Kronos Worldwide, Inc. | Germany |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 652.0 |  |  | 652.0 |  |  |  | 652.0
Corporate Tax Purposes | Kronos Worldwide, Inc. | Belgium |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 50.0 |  |  | 50.0 |  |  |  | 50.0
Trade Tax Purposes | Kronos Worldwide, Inc. | Germany |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 0.5 |  |  | 0.5 |  |  |  | 0.5
Direct Investment in Subsidiary | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liability |  |  |  | 157.6 |  |  | 157.6 |  |  |  | 157.6
Deferred income taxes expense |  | $ 113.0 |  |  |  |  |  |  | $ 19.2 | $ 49.3 |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liability |  |  |  | $ 155.4 |  |  | $ 155.4 |  |  |  | $ 155.4
Canada Revenue Agency and German Federal Central Tax Office | Germany | Germany-Canada APA |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash income tax benefit related to increase in German NOLs |  |  |  |  | 2.6 |  |  |  |  |  |
Cash tax refund |  |  |  |  | $ 0.6 |  |  |  |  |  |

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