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Noncontrolling Interest in Subsidiaries (Tables) | 3 Months Ended
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Mar. 31, 2018
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, 2017 |  |  | March 31, 2018 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 204.9 |  |  | $ | 217.5 |
NL Industries |  | 71.1 |  |  |  | 74.1 |
CompX International |  | 17.8 |  |  |  | 18.2 |
BMI |  | 26.0 |  |  |  | 27.5 |
LandWell |  | 22.5 |  |  |  | 25.1 |
Total | $ | 342.3 |  |  | $ | 362.4 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
| Three months ended March 31, |
| 2017 |  |  | 2018 |
| (In millions) |
Noncontrolling interest in net income of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | 7.2 |  |  | $ | 13.8 |
NL Industries |  | 1.4 |  |  |  | 2.4 |
CompX International |  | .4 |  |  |  | .5 |
BMI |  | — |  |  |  | .6 |
LandWell |  | .1 |  |  |  | 1.2 |
Total | $ | 9.1 |  |  | $ | 18.5 |

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