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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - Kronos - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net sales | $ 356.1 | $ 336.5 | $ 1,030.6 | $ 1,061.8
Cost of sales | 280.6 | 293.3 | 859.2 | 894.7
Income (loss) from operations | 28.0 | (3.2) | 38.2 | 18.6
Income tax expense (benefit) | 0.7 | (7.4) | 3.2 | 147.1
Net income (loss) | $ 22.2 | $ (11.8) | $ 20.1 | $ (153.2)

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