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Income Taxes - Additional Information (Detail) CAD in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2017 CAD
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  | 35.00% |  | 35.00% |  |  |  |  | 35.00% | 35.00% |  |
Estimated reversal of deferred income tax asset valuation allowance |  | $ 11.7 |  |  |  |  |  |  | $ 11.7 |  |  |
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 matters will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. As a result of ongoing audits in certain jurisdictions, in 2008 Kronos filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany. These requests have been under review with the respective tax authorities since 2008 and prior to 2016, it was uncertain whether an agreement would be reached between the tax authorities and whether we would agree to execute and finalize such agreements. |  |  |
Income taxes | $ 5.1 | 22.9 |  |  |  |  |  |  | $ 22.9 |  | $ 5.1 |
Increase (decrease) in unrecognized tax benefits |  | (8.0) |  |  |  |  |  |  | $ (8.0) |  |  |
US-Canada APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current U.S. income tax benefit |  |  |  | $ (5.6) |  |  |  |  |  |  |  |
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 |  | 8.1 |  |  |  |  |  |  |  |  |  |
Earliest Tax Year | Canada - Germany APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  | 2005 |  |  |
Latest Tax Year | Canada - Germany APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  |  |  |  |  |  | 2017 |  |  |
Germany | Canada - Germany APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash income tax benefit related to increase in German NOLs |  | 2.6 |  |  |  |  |  |  |  |  |  |
Cash tax refund |  | 0.6 |  |  |  |  |  |  |  |  |  |
Germany and Belgium |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  | $ (170.4) |  |  |
Kronos Worldwide, Inc. | Earliest Tax Year | US-Canada APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  | 2005 |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Latest Tax Year | US-Canada APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective tax year |  |  |  | 2015 |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Direct investment in subsidiary excess carrying amount |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes expense (benefit) |  |  |  |  | $ (29.3) | $ (29.3) | $ (29.3) |  | 49.3 | $ 9.1 | 6.5 |
Kronos Worldwide, Inc. | Germany | Corporate Tax Purposes |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 638.0 |  |  |  |  |  |  |  |  |  | 638.0 |
Kronos Worldwide, Inc. | Germany | Trade Tax Purposes |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 71.0 |  |  |  |  |  |  |  |  |  | 71.0 |
Kronos Worldwide, Inc. | Belgium | Corporate Tax Purposes |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 93.0 |  |  |  |  |  |  |  |  |  | 93.0 |
Kronos Canadian Subsidiary | US-Canada APA |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  | 2.3 |  |  |  |  |  |  | 2.3 |  |  | CAD 3
Current Periods Net Operating Loss Utilization | Germany and Belgium |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  | (7.8) |  |  |  |  |  | $ (12.7) |  |  |  |
Current Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. | Germany and Belgium |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  | $ (7.8) |  |  |  |  |  |  |  |  | $ (2.2) |
Deferred income taxes expense (benefit) |  |  |  |  |  |  |  | $ (12.7) |  |  |  |
Expected Future Periods Net Operating Loss Utilization |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  | $ (149.9) |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Germany |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  | (141.9) |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Belgium |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  | (8.0) |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance | (173.0) |  | $ (149.9) |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. | Germany |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance | (153.0) |  |  |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. | Belgium |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance | $ (20.0) |  |  |  |  |  |  |  |  |  |  |
Effect of Currency Exchange Rates |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  | $ 9.0 |  |  |

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