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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments Debt And Equity Securities [Abstract] |
Classification of Marketable Securities |
|  | Fair value |  |  |  |  |  |  |  |  |  |  |  |
|  | measurement |  | Market |  |  | Cost |  |  |  |  |
Marketable security |  | level |  | value |  |  | basis |  |  | Unrealized gain |
|  |  |  | (In millions) |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock |  | 1 |  | $ | 10.6 |  |  | $ | 3.2 |  |  | $ | 7.4 |
NL and CompX common stocks |  | 1 |  |  | .1 |  |  |  | .1 |  |  |  | - |
Total |  |  |  | $ | 10.7 |  |  | $ | 3.3 |  |  | $ | 7.4 |
March 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock |  | 1 |  | $ | 10.4 |  |  | $ | 3.2 |  |  | $ | 7.2 |
NL and CompX common stocks |  | 1 |  |  | .1 |  |  |  | .1 |  |  |  | - |
Total |  |  |  | $ | 10.5 |  |  | $ | 3.3 |  |  | $ | 7.2 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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