Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Subsidiaries (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 391.5	$ 358.1
Basic Management, Inc.
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	33.7
Landwell
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	27.8
Kronos Worldwide, Inc.
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	241.9	267.0
NL
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	74.5	77.8
CompX
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 13.6	$ 13.3