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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - Kronos - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]    
Current assets $ 1,230.5 $ 1,062.5
Property and equipment, net 487.4 506.4
Investment in TiO2 joint venture 80.3 86.5
Other noncurrent assets 132.2 169.0
Total assets 1,930.4 1,824.4
Current liabilities 265.4 231.5
Long-term debt 460.9 473.8
Accrued pension and postretirement benefits 253.3 261.9
Other noncurrent liabilities 97.2 102.9
Stockholders' equity 853.6 754.3
Total liabilities and stockholders' equity $ 1,930.4 $ 1,824.4