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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2021: |  |  |  | ​ |  |  | ​ |  |  | ​ |
Valhi common stock |  | 1 | ​ | $ | 4.1 | ​ | $ | 3.2 | ​ | $ | .9
NL and CompX common stocks |  | 1 | ​ |  | .1 | ​ |  | .1 | ​ |  | -
Total | ​ | ​ | ​ | $ | 4.2 | ​ | $ | 3.3 | ​ | $ | .9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022: | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |
Valhi common stock |  | 1 | ​ | $ | 3.2 | ​ | $ | 3.2 | ​ | $ | -
​

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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 No definition available. + Details
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