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Noncontrolling Interest in Subsidiaries (Tables) | 3 Months Ended
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Mar. 31, 2021
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, |  |  | March 31, |
| 2020 |  |  | 2021 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 212.3 |  |  | $ | 213.2 |
NL Industries |  | 67.1 |  |  |  | 69.3 |
CompX International |  | 23.5 |  |  |  | 22.0 |
BMI |  | 14.7 |  |  |  | 15.7 |
LandWell |  | 6.8 |  |  |  | 8.8 |
Total | $ | 324.4 |  |  | $ | 329.0 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
| Three months ended March 31, |
| 2020 |  |  | 2021 |
| (In millions) |
Noncontrolling interest in net income of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | 5.2 |  |  | $ | 3.8 |
NL Industries |  | .3 |  |  |  | 2.3 |
CompX International |  | .6 |  |  |  | .6 |
BMI |  | 2.8 |  |  |  | 1.1 |
LandWell |  | 4.6 |  |  |  | 1.9 |
Total | $ | 13.5 |  |  | $ | 9.7 |

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