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Noncontrolling Interest in Subsidiaries (Tables) | 9 Months Ended
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Sep. 30, 2018
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
| December 31, 2017 |  |  | September 30, 2018 |
| (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |
Kronos Worldwide | $ | 204.9 |  |  | $ | 228.1 |
NL Industries |  | 71.1 |  |  |  | 63.7 |
CompX International |  | 17.8 |  |  |  | 19.2 |
BMI |  | 26.0 |  |  |  | 28.0 |
LandWell |  | 22.5 |  |  |  | 26.0 |
Total | $ | 342.3 |  |  | $ | 365.0 |
Schedule of Noncontrolling Interest in Net Income of Subsidiaries |
| Nine months ended September 30, |
| 2017 |  |  | 2018 |
| (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |
Kronos Worldwide | $ | 60.0 |  |  | $ | 35.3 |
NL Industries |  | 11.4 |  |  |  | (7.4 | )
CompX International |  | 1.2 |  |  |  | 1.6 |
BMI |  | .3 |  |  |  | 1.1 |
LandWell |  | .5 |  |  |  | 2.1 |
Total | $ | 73.4 |  |  | $ | 32.7 |

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