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Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Long-term debt |  |
Total debt | $ 811.3 | $ 1,043.1
Less current maturities | 1.6 | 1.6
Total long-term debt | 809.7 | 1,041.5
VALHI, INC. |  |
Long-term debt |  |
Total debt | 314.3 | 534.3
VALHI, INC. | Contran Credit Facility |  |
Long-term debt |  |
Total debt | 314.3 | 284.3
VALHI, INC. | Notes Payable, Other Payables | Snake River |  |
Long-term debt |  |
Total debt |  | 250.0
Kronos Worldwide, Inc. | 3.75% Senior Secured Notes due September 15, 2025 | Kronos International, Inc |  |
Long-term debt |  |
Total debt | 463.0 | 471.1
Tremont | Promissory Note |  |
Long-term debt |  |
Total debt | 10.9 | 13.1
BMI | Bank loan | Western Alliance Bank |  |
Long-term debt |  |
Total debt | 18.0 | 18.8
LandWell | Unsecured Debt |  |
Long-term debt |  |
Total debt | 2.3 | 2.5
Other Subsidiary | Other |  |
Long-term debt |  |
Total debt | 2.8 | 3.3
Subsidiary |  |
Long-term debt |  |
Total debt | $ 497.0 | $ 508.8

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