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Noncontrolling Interest in Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2014
Noncontrolling Interest [Abstract] |
Noncontrolling Interest in Net Assets of Subsidiaries |
|  | December 31, |
|  | 2013 |  |  | 2014 |
|  | (In millions) |
Noncontrolling interest in net assets: |  |  |  |  |  |  |  |
Kronos Worldwide |  | $ | 241.9 |  |  | $ | 211.0 |
NL Industries |  |  | 74.5 |  |  |  | 54.4 |
CompX International |  |  | 13.6 |  |  |  | 14.4 |
BMI |  |  | 33.7 |  |  |  | 31.7 |
LandWell |  |  | 27.8 |  |  |  | 24.8 |
Total |  | $ | 391.5 |  |  | $ | 336.3 |
Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries |
|  | Years ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
|  | (In millions) |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide |  | $ | 42.6 |  |  | $ | (20.3 | ) |  | $ | 19.2 |
NL Industries |  |  | 15.2 |  |  |  | (9.4 | ) |  |  | 4.8 |
CompX International |  |  | 4.5 |  |  |  | .8 |  |  |  | 1.1 |
BMI |  |  | — |  |  |  | — |  |  |  | .3 |
LandWell |  |  | — |  |  |  | — |  |  |  | .3 |
Total |  | $ | 62.3 |  |  | $ | (28.9 | ) |  | $ | 25.7 |

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