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Noncontrolling interest in subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2021
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2021
​ |  | (In millions)
Noncontrolling interest in net assets: |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 212.3 | ​ | $ | 226.6
NL Industries | ​ |  | 67.1 | ​ |  | 75.7
CompX International | ​ |  | 23.5 | ​ |  | 22.5
BMI | ​ |  | 14.7 | ​ |  | 8.3
LandWell | ​ |  | 6.8 | ​ |  | (4.2)
Total | ​ | $ | 324.4 | ​ | $ | 328.9
Schedule of Noncontrolling Interest in Net Income of Subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In millions)
Noncontrolling interest in net income of subsidiaries: |  | ​ |  |  | ​ |  |  | ​ |
Kronos Worldwide | ​ | $ | 16.9 | ​ | $ | 12.1 | ​ | $ | 22.0
NL Industries | ​ |  | 4.4 | ​ |  | 2.5 | ​ |  | 8.7
CompX International | ​ |  | 2.2 | ​ |  | 1.4 | ​ |  | 2.2
BMI | ​ |  | 2.2 | ​ |  | 7.6 | ​ |  | 14.7
LandWell | ​ |  | 3.3 | ​ |  | 10.2 | ​ |  | 22.9
Total | ​ | $ | 29.0 | ​ | $ | 33.8 | ​ | $ | 70.5

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