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Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) (Kronos Worldwide, Inc.) In Millions, unless otherwise specified |  |  | 1 Months Ended | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jul. 31, 2013 Revolving North American Credit Facility USD ($) | Jun. 30, 2013 Revolving North American Credit Facility USD ($) | Jun. 30, 2013 Bank Of Montreal CAD | Jun. 30, 2013 Economic Development Agency Credit Facility Canada USD ($) | Jun. 30, 2013 Economic Development Agency Credit Facility Canada CAD | Jun. 30, 2013 European Line of Credit USD ($) | Jun. 30, 2013 European Line of Credit EUR (€)
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Percentage of average interest rate |  |  |  |  |  |  |  | 2.03% | 2.03%
Outstanding borrowings under this credit facility | $ 26.1 | $ 13.2 |  | $ 0 |  |  |  | $ 0 |
Percentage of average interest rate, during period |  |  |  |  |  |  |  | 2.02% | 2.02%
Amount available for Borrowing |  |  |  | 119.5 |  |  |  | 130.5 |
Revolving credit facility, borrowings |  |  | 50.0 | 0 |  |  |  |  |
Repayments of Lines of Credit |  |  |  | 0 |  |  |  |  |
Aggregate letter of credit outstanding amount |  |  |  |  | 7.5 |  |  |  |
Issuance of letter of credit |  |  |  |  | 10.0 |  |  |  |
Outstanding borrowings under this credit facility |  |  |  |  |  | 1.8 | 1.8 | 12.8 | 10.0
Imputed interest on borrowings |  |  |  |  |  | $ 0.5 | 0.5 |  |

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