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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - Kronos - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]    
Current assets $ 1,201.4 $ 1,062.5
Property and equipment, net 486.4 506.4
Investment in TiO2 joint venture 81.3 86.5
Other noncurrent assets 129.0 169.0
Total assets 1,898.1 1,824.4
Current liabilities 233.4 231.5
Long-term debt 455.1 473.8
Accrued pension and postretirement benefits 262.9 254.2
Other noncurrent liabilities 106.9 110.6
Stockholders' equity 839.8 754.3
Total liabilities and stockholders' equity $ 1,898.1 $ 1,824.4