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Noncontrolling Interest in Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2020
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, |
| 2019 |  |  | 2020 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 216.6 |  |  | $ | 212.3 |
NL Industries |  | 65.8 |  |  |  | 67.1 |
CompX International |  | 22.7 |  |  |  | 23.5 |
BMI |  | 20.1 |  |  |  | 14.7 |
LandWell |  | 14.9 |  |  |  | 6.8 |
Total | $ | 340.1 |  |  | $ | 324.4 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
| Years ended December 31, |
| 2018 |  |  | 2019 |  |  | 2020 |
| (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide | $ | 39.9 |  |  | $ | 16.9 |  |  | $ | 12.1 |
NL Industries |  | (7.0 | ) |  |  | 4.4 |  |  |  | 2.5 |
CompX International |  | 2.0 |  |  |  | 2.2 |  |  |  | 1.4 |
BMI |  | 1.5 |  |  |  | 2.2 |  |  |  | 7.6 |
LandWell |  | 2.4 |  |  |  | 3.3 |  |  |  | 10.2 |
Total | $ | 38.8 |  |  | $ | 29.0 |  |  | $ | 33.8 |

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