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Noncontrolling Interest in Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2022
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2022
​ |  | (In millions)
Noncontrolling interest in net assets: |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 226.6 | ​ | $ | 239.3
NL Industries | ​ |  | 75.7 | ​ |  | 79.0
CompX International | ​ |  | 22.5 | ​ |  | 20.6
BMI | ​ |  | 8.3 | ​ |  | 6.9
LandWell | ​ |  | (4.2) | ​ |  | 2.4
Total | ​ | $ | 328.9 | ​ | $ | 348.2
Schedule of Noncontrolling Interest in Net Income of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
​ | ​ | (In millions)
Noncontrolling interest in net income of subsidiaries: |  | ​ |  |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 12.1 | ​ | $ | 22.0 | ​ | $ | 20.0
NL Industries | ​ |  | 2.5 | ​ |  | 8.7 | ​ |  | 5.8
CompX International | ​ |  | 1.4 | ​ |  | 2.2 | ​ |  | 2.6
BMI | ​ |  | 7.6 | ​ |  | 14.7 | ​ |  | 2.8
LandWell | ​ |  | 10.2 | ​ |  | 22.9 | ​ |  | 14.7
Total | ​ | $ | 33.8 | ​ | $ | 70.5 | ​ | $ | 45.9

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