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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Classification of Marketable Securities |
|  | Fair value |  |  |  |  |  |  |  |  |  |  |  |
|  | measurement |  | Market |  |  | Cost |  |  | Unrealized |
Marketable security |  | level |  | value |  |  | basis |  |  | gain (loss) |
|  |  |  | (In millions) |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock |  | 1 |  | $ | 2.1 |  |  | $ | 3.2 |  |  | $ | (1.1 | )
NL and CompX common stocks |  | 1 |  |  | .1 |  |  |  | .1 |  |  |  | - |
Total |  |  |  | $ | 2.2 |  |  | $ | 3.3 |  |  | $ | (1.1 | )
September 30, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock |  | 1 |  | $ | 3.3 |  |  | $ | 3.2 |  |  | $ | .1 |
NL and CompX common stocks |  | 1 |  |  | .1 |  |  |  | .1 |  |  |  | - |
Total |  |  |  | $ | 3.4 |  |  | $ | 3.3 |  |  | $ | .1 |

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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 No definition available. + Details
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