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Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 329.0	$ 324.4
Kronos Worldwide, Inc.
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	213.2	212.3
NL Industries
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	69.3	67.1
CompX International
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	22.0	23.5
BMI
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	15.7	14.7
LandWell
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 8.8	$ 6.8

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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