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Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Long-term debt |  |
Total debt | $ 799.4 | $ 794.3
Less current maturities | (3.2) | (4.9)
Total long-term debt | 796.2 | 789.4
VALHI, INC. | Contran Credit Facility |  |
Long-term debt |  |
Total debt | 301.2 | 313.0
Kronos Worldwide, Inc. | 3.75% Senior Secured Notes due September 15, 2025 | Kronos International, Inc |  |
Long-term debt |  |
Total debt | 464.7 | 442.6
Tremont | Promissory Note |  |
Long-term debt |  |
Total debt |  | 2.0
BMI | Bank loan | Western Alliance Bank |  |
Long-term debt |  |
Total debt | 16.3 | 17.2
LandWell | Unsecured Debt |  |
Long-term debt |  |
Total debt |  | 1.6
LandWell | Unsecured Debt | Western Alliance Bank |  |
Long-term debt |  |
Total debt | 14.5 | 15.0
Other Subsidiary | Other |  |
Long-term debt |  |
Total debt | 2.7 | 2.9
Subsidiary |  |
Long-term debt |  |
Total debt | $ 498.2 | $ 481.3

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