Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets	$ 943.9	$ 781.2
Property and equipment, net	529.0	536.3
Investment in TiO2 joint venture	88.6	102.3
Other noncurrent assets	171.5	199.3
Total assets	1,733.0	1,619.1
Current liabilities	249.0	278.0
Long-term debt	345.8	180.4
Accrued pension and postretirement benefits	163.4	171.6
Other noncurrent liabilities	43.5	54.0
Stockholders’ equity	931.3	935.1
Total liabilities and stockholders’ equity	$ 1,733.0	$ 1,619.1