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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
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Quarterly Results Of Operations Schedule Of Quarterly Results Of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 388.7 | $ 455.2 | $ 510.2 | $ 466.0 | $ 495.9 | $ 496.5 | $ 481.7 | $ 405.3 | $ 1,820.1 | $ 1,879.4 | $ 1,519.4
Gross margin | 107.2 | 132.7 | 184.0 | 185.3 | 185.3 | 161.5 | 141.2 | 114.0 | 609.2 | 612.9 | 307.9
Operating income | 52.7 | 69.2 | 130.0 | 118.8 | 130.0 | 103.1 | 83.1 | 64.1 | 370.7 | 380.3 | 119.2
Net income (loss) from continuing operations | 28.4 | 148.3 | 20.0 | 70.2 | 162.8 | 62.2 | 163.3 | 23.5 | 266.9 | 411.8 | 21.0
Amounts attributable to Valhi stockholders: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 22.3 | 142.8 | 11.3 | 51.7 | 141.1 | 44.2 | 117.0 | 14.4 | 228.1 | 316.7 | 8.1
Income (loss) from discontinued operations | (4.6) | 0.7 | 0.4 | 37.6 | (1.0) | 1.7 | (108.2) | (1.7) | 34.1 | (109.2) | (24.0)
Net income (loss) attributable to Valhi stockholders | $ 17.7 | $ 143.5 | $ 11.7 | $ 89.3 | $ 140.1 | $ 45.9 | $ 8.8 | $ 12.7 | $ 262.2 | $ 207.5 | $ (15.9)
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 0.07 | $ 0.42 | $ 0.03 | $ 0.15 | $ 0.41 | $ 0.13 | $ 0.34 | $ 0.04 | $ 0.67 | $ 0.93 | $ 0.02
Loss from discontinued operations | (0.01) |  |  | 0.11 |  |  | (0.31) |  | 0.10 | (0.32) | (0.07)
Net income (loss) per share | $ 0.06 | $ 0.42 | $ 0.03 | $ 0.26 | $ 0.41 | $ 0.13 | $ 0.03 | $ 0.04 | $ 0.77 | $ 0.61 | $ (0.05)

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