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Fair Value Measurements and Financial Instruments - Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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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 | $ 460.4 | $ 485.7
Long term debt, fair value | 472.4 | 499.9
VALHI, INC. | Contran Credit Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 204.5 | 270.7
Long term debt, fair value | 204.5 | 270.7
BMI | Bank note payable | Meadows Term Loan |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 15.3 | 16.3
Long term debt, fair value | 15.9 | 16.9
LandWell | Bank note payable |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 13.9 | 14.2
Long term debt, fair value | 13.9 | 14.2
Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | 615.2 | 570.3
Deferred payment obligation |  | 1.3
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | $ 615.2 | 570.3
Deferred payment obligation |  | $ 1.3

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