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Financial Instruments - Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Kronos Worldwide, Inc. | 3.75% Senior Secured Notes due September 15, 2025 | Kronos International, Inc |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | $ 485.7 | $ 442.6
Long term debt, fair value | 499.9 | 457.0
VALHI, INC. | Contran Credit Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 270.7 | 313.0
Long term debt, fair value | 270.7 | 313.0
Tremont | Promissory Note |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount |  | 2.0
Long term debt, fair value |  | 2.0
BMI | Bank note payable | Meadows Term Loan |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 16.3 | 17.2
Long term debt, fair value | 16.9 | 17.9
LandWell | Bank note payable |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 14.2 | 15.0
Long term debt, fair value | 14.2 | 15.0
LandWell | Unsecured Debt |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount |  | 1.6
Long term debt, fair value |  | 1.6
Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | 570.3 | 583.8
Deferred payment obligation | 1.3 | 9.9
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | 570.3 | 583.8
Deferred payment obligation | $ 1.3 | $ 9.9

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