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Noncontrolling Interest in Subsidiaries (Tables) | 6 Months Ended
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Jun. 30, 2018
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, 2017 |  |  | June 30, 2018 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 204.9 |  |  | $ | 224.2 |
NL Industries |  | 71.1 |  |  |  | 66.0 |
CompX International |  | 17.8 |  |  |  | 18.7 |
BMI |  | 26.0 |  |  |  | 27.6 |
LandWell |  | 22.5 |  |  |  | 25.2 |
Total | $ | 342.3 |  |  | $ | 361.7 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
| Six months ended June 30, |
| 2017 |  |  | 2018 |
| (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | 45.6 |  |  | $ | 29.0 |
NL Industries |  | 8.4 |  |  |  | (4.8 | )
CompX International |  | .9 |  |  |  | 1.1 |
BMI |  | .2 |  |  |  | .7 |
LandWell |  | .3 |  |  |  | 1.2 |
Total | $ | 55.4 |  |  | $ | 27.2 |

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