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Noncontrolling Interest in Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2021
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, |  |  | September 30, |
| 2020 |  |  | 2021 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 212.3 |  |  | $ | 217.2 |
NL Industries |  | 67.1 |  |  |  | 72.3 |
CompX International |  | 23.5 |  |  |  | 22.5 |
BMI |  | 14.7 |  |  |  | 6.8 |
LandWell |  | 6.8 |  |  |  | (5.6 | )
Total | $ | 324.4 |  |  | $ | 313.2 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
|  | Nine months ended September 30, |
|  | 2020 |  |  | 2021 |
|  | (In millions) |
Noncontrolling interest in net income of subsidiaries: |  |  |  |  |  |  |  |
Kronos Worldwide |  | $ | 10.2 |  |  | $ | 15.8 |
NL Industries |  |  | 1.8 |  |  |  | 6.2 |
CompX International |  |  | 1.1 |  |  |  | 1.8 |
BMI |  |  | 4.4 |  |  |  | 4.0 |
LandWell |  |  | 4.9 |  |  |  | 6.3 |
Total |  | $ | 22.4 |  |  | $ | 34.1 |

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