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Noncontrolling Interest in Subsidiaries (Tables) | 3 Months Ended
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Mar. 31, 2017
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, 2016 |  |  | March 31, 2017 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 134.5 |  |  | $ | 140.7 |
NL Industries |  | 44.3 |  |  |  | 45.9 |
CompX International |  | 16.4 |  |  |  | 16.7 |
BMI |  | 24.6 |  |  |  | 24.7 |
LandWell |  | 23.7 |  |  |  | 23.8 |
Total | $ | 243.5 |  |  | $ | 251.8 |
Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries |
| Three months ended March 31, |
| 2016 |  |  | 2017 |
| (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | (.8 | ) |  | $ | 7.2 |
NL Industries |  | (.4 | ) |  |  | 1.4 |
CompX International |  | .3 |  |  |  | .4 |
BMI |  | (1.4 | ) |  |  | — |
LandWell |  | (.2 | ) |  |  | .1 |
Total | $ | (2.5 | ) |  | $ | 9.1 |

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