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Income Taxes - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended |  | 9 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2013 Proposed adjustment to certain foreign tax liabilities USD ($) | Sep. 30, 2013 Kronos Worldwide, Inc. Bank Of Montreal CAD | Sep. 30, 2012 France | Sep. 30, 2012 France Chemicals USD ($)
Income Taxes Disclosure [Line Items] |  |  |  |  |  |
Letter of credit collateralized |  |  |  | 7.5 |  |
Potential cash tax liability full amount for the proposed adjustment |  |  | 15.7 |  |  |
Unrecognized tax benefits |  | 4.4 |  |  |  |
Net Incremental tax benefit | 11.1 |  |  |  |  |
Nondeductible surtax on dividend distributions |  |  |  |  | 3.00% |
Distributed dividend |  |  |  |  |  | 1.8
Undistributed earnings |  |  |  |  |  | $ 10.9

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