Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets	$ 937.9	$ 781.2
Property and equipment, net	534.4	536.3
Investment in TiO2 joint venture	97.8	102.3
Other noncurrent assets	185.9	199.3
Total assets	1,756.0	1,619.1
Current liabilities	274.9	278.0
Long-term debt	346.6	180.4
Accrued pension and postretirement benefits	165.7	171.6
Other noncurrent liabilities	48.2	54.0
Stockholders’ equity	920.6	935.1
Total liabilities and stockholders’ equity	$ 1,756.0	$ 1,619.1