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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - Kronos - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |
Net sales | $ 1,731.1 | $ 1,661.9 | $ 1,729.0
Cost of sales | 1,344.9 | 1,099.7 | 1,159.3
Income from operations | 145.8 | 330.1 | 347.8
Income tax expense (benefit) | 34.0 | 88.8 | (48.8)
Net income | $ 87.1 | $ 205.0 | $ 354.5

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