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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Quarterly Results Of Operations Schedule Of Quarterly Results Of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 495.9 | $ 496.5 | $ 481.7 | $ 405.3 | $ 390.5 | $ 393.1 | $ 387.5 | $ 348.3 | $ 1,879.4 | $ 1,519.4 | $ 1,487.9
Gross margin | 185.3 | 161.5 | 141.2 | 114.0 | 101.4 | 85.7 | 64.7 | 48.4 | 602.0 | 300.2 | 228.4
Operating income | 125.4 | 98.6 | 78.8 | 60.1 | 55.2 | 34.8 | 16.9 | 0.5 | 362.9 | 107.4 | 21.1
Net income (loss) from continuing operations | 162.8 | 62.2 | 163.3 | 23.5 | 24.1 | 13.3 | (2.4) | (14.0) | 411.8 | 21.0 | (149.4)
Amounts attributable to Valhi stockholders: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | 141.1 | 44.2 | 117.0 | 14.4 | 15.5 | 7.3 | (3.2) | (11.5) | 316.7 | 8.1 | (111.9)
Loss from discontinued operations | (1.0) | 1.7 | (108.2) | (1.7) | (6.3) | (4.3) | (5.5) | (7.9) | (109.2) | (24.0) | (21.7)
Net income (loss) attributable to Valhi stockholders | $ 140.1 | $ 45.9 | $ 8.8 | $ 12.7 | $ 9.2 | $ 3.0 | $ (8.7) | $ (19.4) | $ 207.5 | $ (15.9) | $ (133.6)
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 0.41 | $ 0.13 | $ 0.34 | $ 0.04 | $ 0.05 | $ 0.02 | $ (0.01) | $ (0.04) | $ 0.93 | $ 0.02 | $ (0.33)
Loss from discontinued operations |  |  | (0.31) |  | (0.02) | (0.01) | (0.01) | (0.02) | (0.32) | (0.07) | (0.06)
Net income (loss) per share | $ 0.41 | $ 0.13 | $ 0.03 | $ 0.04 | $ 0.03 | $ 0.01 | $ (0.02) | $ (0.06) | $ 0.61 | $ (0.05) | $ (0.39)

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