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Income Taxes - Additional Information (Detail) CAD in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CAD
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  | 35.00% | 35.00% | 35.00% |
Equity ownership percentage |  | 50.00% |  |  |  | 50.00% |  |  |
Non-cash income tax benefit recognized related to completion of audit |  |  |  |  | $ 3.2 |  |  |  |
Unrecognized tax benefits impact on effective tax rate | $ 29.2 | $ 23.4 |  |  |  | $ 23.4 | $ 24.2 | $ 29.2 |
Increase (decrease) in unrecognized tax benefits |  | 6.6 |  |  |  | 6.6 |  |  |
Accrued interest and penalties during the period |  |  |  |  |  | 1.3 | 1.2 | 1.3 |
Accrued interest and penalties end of the period |  | 4.2 |  |  |  | 4.2 | 4.1 |  |
Deferred income taxes |  |  |  |  |  | 85.7 | 10.0 | $ (114.8) |
U.S. Income Tax Audit |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Non-cash income tax benefit recognized related to completion of audit |  |  |  |  |  |  | 3.1 |  |
Kronos Worldwide, Inc. | Bank Of Montreal |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit collateralized | CAD |  |  |  |  |  |  |  |  | CAD 7.9
Kronos Worldwide, Inc. | Direct investment in subsidiary excess carrying amount |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Deferred income taxes |  | 29.3 | $ 29.3 | $ 29.3 |  |  |  |  |
Canada | Canadian Income Tax Audit |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Non-cash income tax benefit recognized related to completion of audit |  |  |  |  |  |  | $ 3.0 |  |
Germany | Kronos Worldwide, Inc. | Corporate Tax Purposes |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 683.0 |  |  |  | 683.0 |  |  |
Germany | Kronos Worldwide, Inc. | Trade Tax Purposes |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 96.0 |  |  |  | 96.0 |  |  |
Belgium | Kronos Worldwide, Inc. | Corporate Tax Purposes |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 86.0 |  |  |  | 86.0 |  |  |
Germany and Belgian | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Deferred income tax asset valuation allowance |  | $ 159.0 | $ 8.7 | $ 150.3 |  | 159.0 |  |  |
Increase in deferred income tax valuation allowance |  |  |  |  |  | $ 9.8 |  |  |
BMI |  |  |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Equity ownership percentage | 32.00% |  |  |  |  |  |  | 32.00% | 32.00%
Parent company ownership interest | 63.00% |  |  |  |  |  |  | 63.00% | 63.00%
Incremental tax (benefit) on earnings of non-U.S. and non-tax group companies | $ (11.1) |  |  |  |  |  |  |  |

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