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Noncontrolling Interest in Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2017
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |  |
Kronos Worldwide |  | $ | 134.5 |  |  | $ | 204.9 |
NL Industries |  |  | 44.3 |  |  |  | 71.1 |
CompX International |  |  | 16.4 |  |  |  | 17.8 |
BMI |  |  | 24.6 |  |  |  | 26.0 |
LandWell |  |  | 23.7 |  |  |  | 22.5 |
Total |  | $ | 243.5 |  |  | $ | 342.3 |
Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries |
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide |  | $ | (34.3 | ) |  | $ | 8.3 |  |  | $ | 69.3 |
NL Industries |  |  | (4.0 | ) |  |  | 2.6 |  |  |  | 19.7 |
CompX International |  |  | 1.2 |  |  |  | 1.4 |  |  |  | 1.7 |
BMI |  |  | .1 |  |  |  | (.4 | ) |  |  | 3.2 |
LandWell |  |  | (.5 | ) |  |  | 1.0 |  |  |  | 1.2 |
Total |  | $ | (37.5 | ) |  | $ | 12.9 |  |  | $ | 95.1 |

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