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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 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 | $ 5.9 |  |  |
Business interest income, adjusted taxable income | 30.00% |  |  |
Increase (decrease) in unrecognized tax benefits | $ (1.8) |  |  |
Transition Tax | Maximum |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Percentage of annual usage limitation on net operating loss carryforward | 80.00% |  |  |
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 |  |  | $ (5.0) |
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 | Income Tax Payable | Contran |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Current income tax expense payable in increments over remainder of eight year period |  | $ 70.1 |  | 70.1
European Subsidiaries | Transition Tax | Income Tax Receivable | Contran |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Current income tax expense payable in next fiscal year |  | 6.1 |  | 6.1
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 | $ 0.8 | 5.3 |  |
Corporate Tax Purposes | Kronos Worldwide, Inc. | Germany |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards |  | 652.0 |  | 652.0
Corporate Tax Purposes | Kronos Worldwide, Inc. | Belgium |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards |  | 50.0 |  | 50.0
Trade Tax Purposes | Kronos Worldwide, Inc. | Germany |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards |  | 0.5 |  | 0.5
Direct Investment in Subsidiary | Kronos Worldwide, Inc. |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Deferred income tax liability |  | 157.6 |  | 157.6
Deferred income taxes expense | $ 3.6 |  | $ 10.0 |
Direct Investment in Subsidiary | Kronos Worldwide, Inc. | Maximum |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Deferred income tax liability |  | $ 173.0 |  | $ 173.0

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