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Fair Value Measurements and Financial Instruments - Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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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 | $ 464.7 | $ 442.6
Long term debt, fair value | 465.0 | 457.0
VALHI, INC. | Contran Credit Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 301.2 | 313.0
Long term debt, fair value | 301.2 | 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 | 14.5 | 15.0
Long term debt, fair value | 14.5 | 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 | 546.7 | 583.8
Deferred payment obligation | 9.0 | 9.9
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | 546.7 | 583.8
Deferred payment obligation | $ 9.9 | $ 9.9

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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