Accounts and Other Receivables, Net - Components of Accounts and Other Receivables (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Trade accounts receivable:
VAT and other receivables	$ 35.0	$ 32.7
Refundable income taxes	11.3	15.2
Allowance for doubtful accounts	(1.4)	(1.3)
Total	372.1	303.3
Other
Trade accounts receivable:
Receivable from affiliates: Other	0.9	0.5
Kronos Worldwide, Inc.
Trade accounts receivable:
Accounts receivable	302.1	226.1
CompX
Trade accounts receivable:
Accounts receivable	12.5	8.7
WCS
Trade accounts receivable:
Accounts receivable	10.6	7.2
BMI and LandWell
Trade accounts receivable:
Accounts receivable	1.1
LPC | trade items
Trade accounts receivable:
Receivable from affiliates: LPC - trade items		$ 14.2