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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Detail) - Kronos - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Schedule Of Equity Method Investments [Line Items] |  |
Current assets | $ 690.5 | $ 710.8
Property and equipment, net | 446.6 | 429.5
Investment in TiO2 joint venture | 79.8 | 82.9
Other noncurrent assets | 24.6 | 19.5
Total assets | 1,241.5 | 1,242.7
Current liabilities | 206.5 | 201.7
Long-term debt | 336.0 | 337.2
Accrued pension and postretirement benefits | 210.3 | 209.4
Other noncurrent liabilities | 33.8 | 32.5
Stockholders' equity | 454.9 | 461.9
Total liabilities and stockholders' equity | $ 1,241.5 | $ 1,242.7

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