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Noncontrolling Interest in Subsidiaries (Tables) | 6 Months Ended
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Jun. 30, 2022
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | June 30,
​ |  | 2021 |  | 2022
​ |  | (In millions)
Noncontrolling interest in net assets: |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 226.6 | ​ | $ | 230.0
NL Industries | ​ |  | 75.7 | ​ |  | 81.7
CompX International | ​ |  | 22.5 | ​ |  | 22.9
BMI | ​ |  | 8.3 | ​ |  | 3.5
LandWell | ​ |  | (4.2) | ​ |  | (2.9)
Total | ​ | $ | 328.9 | ​ | $ | 335.2
Schedule of Noncontrolling Interest in Net Income of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2021 |  | 2022
​ | ​ | (In millions)
Noncontrolling interest in net income (loss) of subsidiaries: |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 8.8 | ​ | $ | 19.8
NL Industries | ​ |  | 4.4 | ​ |  | 8.3
CompX International | ​ |  | 1.2 | ​ |  | 1.5
BMI | ​ |  | 1.6 | ​ |  | (1.9)
LandWell | ​ |  | 2.6 | ​ |  | 4.7
Total | ​ | $ | 18.6 | ​ | $ | 32.4

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