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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Short-term Investments and Financial Instruments Carried at Fair Value | The following table summarizes the valuation of our short-term investments and financial instruments by the ASC Topic 820 categories as of December 31, 2019 and 2020:
| Fair Value Measurements |
| Total |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |
| (In millions) |
Asset (liability) |  |  |  |  |  |  |  |  |  |  |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
Current | $ | 2.1 |  |  | $ | - |  |  | $ | 2.1 |
Noncurrent |  | 6.2 |  |  |  | 1.3 |  |  |  | 4.9 |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
Current | $ | 4.4 |  |  | $ | - |  |  | $ | 4.4 |
Noncurrent |  | 2.9 |  |  |  | .2 |  |  |  | 2.7 |
Financial Instruments not Carried at Fair Value | The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2019 and 2020:
| December 31, 2019 |  |  | December 31, 2020 |
| Carrying amount |  |  | Fair value |  |  | Carrying amount |  |  | Fair value |
| (In millions) |
Cash, cash equivalents and restricted cash equivalents | $ | 583.8 |  |  | $ | 583.8 |  |  | $ | 570.3 |  |  | $ | 570.3 |
Deferred payment obligation |  | 9.9 |  |  |  | 9.9 |  |  |  | 1.3 |  |  |  | 1.3 |
Long-term debt (excluding capitalized leases): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kronos Senior Notes |  | 442.6 |  |  |  | 457.0 |  |  |  | 485.7 |  |  |  | 499.9 |
Valhi credit facility with Contran |  | 313.0 |  |  |  | 313.0 |  |  |  | 270.7 |  |  |  | 270.7 |
Tremont promissory note payable |  | 2.0 |  |  |  | 2.0 |  |  |  | - |  |  |  | - |
BMI bank note payable |  | 17.2 |  |  |  | 17.9 |  |  |  | 16.3 |  |  |  | 16.9 |
LandWell note payable to the City of Henderson |  | 1.6 |  |  |  | 1.6 |  |  |  | - |  |  |  | - |
LandWell bank note payable |  | 15.0 |  |  |  | 15.0 |  |  |  | 14.2 |  |  |  | 14.2 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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