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Income Taxes - Additional Information (Detail) CAD in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 CAD
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  | 35.00% | 35.00% |  |  |  | 35.00% | 35.00% |  |
Reversal of deferred income tax asset valuation |  |  |  |  |  |  |  | $ 163.0 |  |  |
Estimated reversal of deferred income tax asset valuation allowance | $ 20.0 |  | $ 20.0 |  |  |  |  | $ 20.0 |  |  |
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. We believe we have adequate accruals for additional taxes and related interest expense which could ultimately result from tax examinations. We believe the ultimate disposition of tax examinations should not have a material adverse effect on our consolidated financial position, results of operations or liquidity. 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. During 2016, Contran, as the ultimate parent of our U.S. Consolidated income tax group, executed and finalized an Advance Pricing Agreement with the U.S. Internal Revenue Service and our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (collectively, the “U.S.-Canada APA”) effective for tax years 2005 - 2015. |  |  |
Income taxes | 11.5 | $ 5.1 | 11.5 |  |  |  |  | $ 11.5 |  | $ 5.1 |
Increase (decrease) in unrecognized tax benefits | (15.0) |  | (15.0) |  |  |  |  | (15.0) |  |  |
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) | 39.5 | $ 3.4 | $ 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 |  |  |  |  | 2.3 |  |  | CAD 3
Current Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. | Germany and Belgium |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  |  |  |  |  |  |  |  | $ (2.2) |
Deferred income taxes expense (benefit) |  |  | $ (7.7) |  |  |  |  | (12.7) |  |  |
Expected Future Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance | 149.9 | (173.0) |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. | Germany |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance | 141.9 | (153.0) |  |  |  |  |  |  |  |  |
Expected Future Periods Net Operating Loss Utilization | Kronos Worldwide, Inc. | Belgium |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance | $ 8.0 | $ (20.0) |  |  |  |  |  |  |  |  |
Effect of Currency Exchange Rates | Kronos Worldwide, Inc. | Germany and Belgium |  |  |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  |  |  |  |  |  |  | $ 9.5 |  |  |

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