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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 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 |  |  |  |  |  |  |  | $ 77.1
Provision for income taxes includes non-cash deferred income tax expense |  |  |  |  | $ 7.1 |  |  |
Business interest income, adjusted taxable income |  |  |  |  | 30.00% |  |  |
Increase (decrease) in unrecognized tax benefits | $ (1.8) |  |  |  | $ (1.8) |  |  |
Germany-Canada APA |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Non-cash income tax benefit |  |  |  |  | 1.4 |  |  |
ASC 740 | Discontinued Operations |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes includes non-cash deferred income tax expense |  |  |  |  | 5.1 |  |  |
ASC 740 | Continuing Operations |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Provision for income taxes includes non-cash deferred income tax expense |  |  |  |  | $ 2.0 |  |  |
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 |  |  |  |  |  | $ (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 |  |  |  |  |
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 | 3.1 |  |  |  |  |  |  |
European Subsidiaries | Transition Tax | Contran |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Income taxes payable noncurrent | 64.0 |  |  |  | $ 64.0 |  |  |
Income taxes payable current | 3.0 |  |  |  | 3.0 |  |  |
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 | $ 67.0 |  |  |  | 67.0 |  |  |
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 |  | 2.3 |  |  |
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 |  |  |  |  | $ 7.5 |  | $ 39.5 |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. | Maximum |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Deferred income tax liability |  |  | $ 173.0 |  |  | $ 173.0 |  | $ 173.0

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