Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts payable:
Accounts payable	$ 136.2	$ 133.2
Current accrued liabilities:
Employee benefits	34.6	36.1
Accrued sales discounts and rebates	23.0	16.7
Deferred income	19.8	36.9
Accrued litigation settlement		35.0
Environmental costs	10.2	9.1	7.6
Reserve for uncertain tax positions		3.1
Other	40.4	51.3
Total	128.0	188.2
Noncurrent accrued liabilities:
Reserve for uncertain tax positions	34.1	49.8
Asset retirement obligations	27.2	25.6
Deferred income	18.9	1.3
Employee benefits	8.1	12.2
Insurance claims and expenses	9.5	9.5
Deferred payment obligation	8.5	8.2
Other	6.4	3.6
Total	112.7	110.2
Basic Management Inc And Landwell
Accounts payable:
Accounts payable	7.0	5.6
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	121.4	124.0
CompX
Accounts payable:
Accounts payable	3.9	1.5
WCS
Accounts payable:
Accounts payable	1.4	0.4
Other
Accounts payable:
Accounts payable	$ 2.5	$ 1.7