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Noncontrolling Interest in Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2020
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, |  |  | September 30, |
| 2019 |  |  | 2020 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 216.6 |  |  | $ | 213.5 |
NL Industries |  | 65.8 |  |  |  | 66.5 |
CompX International |  | 22.7 |  |  |  | 23.3 |
BMI |  | 20.1 |  |  |  | 20.8 |
LandWell |  | 14.9 |  |  |  | 16.1 |
Total | $ | 340.1 |  |  | $ | 340.2 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
| Nine months ended September 30, |
| 2019 |  |  | 2020 |
| (In millions) |
Noncontrolling interest in net income of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | 15.1 |  |  | $ | 10.2 |
NL Industries |  | 3.3 |  |  |  | 1.8 |
CompX International |  | 1.7 |  |  |  | 1.1 |
BMI |  | 2.1 |  |  |  | 4.4 |
LandWell |  | 3.1 |  |  |  | 4.9 |
Total | $ | 25.3 |  |  | $ | 22.4 |

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