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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Quarterly Results Of Operations Schedule Of Quarterly Results Of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 516.8 | $ 458.6 | $ 415.0 | $ 459.3 | $ 414.1 | $ 475.2 | $ 528.6 | $ 479.6 | $ 1,849.7 | $ 1,897.5 | $ 1,820.1
Gross margin | 118.7 | 89.7 | 104.0 | 99.7 | 91.2 | 98.4 | 123.2 | 121.8 | 412.1 | 434.6 | 609.2
Operating income | 46.9 | 28.9 | 39.3 | 71.0 | 25.0 | 41.4 | 65.9 | 60.4 | 186.1 | 192.7 | 370.7
Net income from continuing operations | 31.6 | 19.4 | (4.2) | 37.9 | 14.4 | 17.2 | 18.2 | 28.4 | 84.7 | 78.2 | 266.9
Amounts attributable to Valhi stockholders: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | 20.2 | 15.4 | (9.1) | 24.4 |  |  |  |  | 50.9 | 49.2 | 228.1
Income from discontinued operations | 4.3 |  |  |  |  |  |  |  | 4.3 |  | 34.1
Net income attributable to Valhi stockholders | $ 24.5 | $ 15.4 | $ (9.1) | $ 24.4 | $ 10.8 | $ 13.1 | $ 7.1 | $ 18.2 | $ 55.2 | $ 49.2 | $ 262.2
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 0.71 | $ 0.54 | $ (0.32) | $ 0.86 |  |  |  |  | $ 1.79 | $ 1.73 | $ 8.00
Income from discontinued operations | 0.15 |  |  |  |  |  |  |  | 0.15 |  | 1.20
Net income per basic and diluted share | $ 0.86 | $ 0.54 | $ (0.32) | $ 0.86 | $ 0.38 | $ 0.46 | $ 0.25 | $ 0.64 | $ 1.94 | $ 1.73 | $ 9.20

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