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Noncontrolling interest in subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2023
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2023
​ |  | (In millions)
Noncontrolling interest in net assets: |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 239.3 | ​ | $ | 209.0
NL Industries | ​ |  | 79.0 | ​ |  | 76.9
CompX International | ​ |  | 20.6 | ​ |  | 22.0
BMI | ​ |  | 6.9 | ​ |  | 11.0
LandWell | ​ |  | 2.4 | ​ |  | 6.8
Total | ​ | $ | 348.2 | ​ | $ | 325.7
Schedule of Noncontrolling interest in net income (loss) of subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2023
​ |  | (In millions)
Noncontrolling interest in net assets: |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 239.3 | ​ | $ | 209.0
NL Industries | ​ |  | 79.0 | ​ |  | 76.9
CompX International | ​ |  | 20.6 | ​ |  | 22.0
BMI | ​ |  | 6.9 | ​ |  | 11.0
LandWell | ​ |  | 2.4 | ​ |  | 6.8
Total | ​ | $ | 348.2 | ​ | $ | 325.7
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | (In millions)
Noncontrolling interest in net income (loss) of subsidiaries: |  | ​ |  |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 22.0 | ​ | $ | 20.0 | ​ | $ | (9.5)
NL Industries | ​ |  | 8.7 | ​ |  | 5.8 | ​ |  | (.4)
CompX International | ​ |  | 2.2 | ​ |  | 2.6 | ​ |  | 2.9
BMI | ​ |  | 14.7 | ​ |  | 2.8 | ​ |  | 8.2
LandWell | ​ |  | 22.9 | ​ |  | 14.7 | ​ |  | 13.8
Total | ​ | $ | 70.5 | ​ | $ | 45.9 | ​ | $ | 15.0
​

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