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Noncontrolling Interest in Subsidiaries (Tables) | 6 Months Ended
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Jun. 30, 2017
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, 2016 |  |  | June 30, 2017 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 134.5 |  |  | $ | 178.8 |
NL Industries |  | 44.3 |  |  |  | 53.0 |
CompX International |  | 16.4 |  |  |  | 17.0 |
BMI |  | 24.6 |  |  |  | 24.8 |
LandWell |  | 23.7 |  |  |  | 24.1 |
Total | $ | 243.5 |  |  | $ | 297.7 |
Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries |
| Six months ended June 30, |
| 2016 |  |  | 2017 |
| (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | (.5 | ) |  | $ | 45.6 |
NL Industries |  | (.2 | ) |  |  | 8.4 |
CompX International |  | .6 |  |  |  | .9 |
BMI |  | (1.3 | ) |  |  | .2 |
LandWell |  | (.3 | ) |  |  | .3 |
Total | $ | (1.7 | ) |  | $ | 55.4 |

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