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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Quarterly Results Of Operations Schedule Of Quarterly Results Of Operations [Abstract]
Net sales	$ 432.0us-gaap_SalesRevenueNet	$ 476.5us-gaap_SalesRevenueNet	$ 491.7us-gaap_SalesRevenueNet	$ 462.4us-gaap_SalesRevenueNet	$ 400.1us-gaap_SalesRevenueNet	$ 448.2us-gaap_SalesRevenueNet	$ 516.1us-gaap_SalesRevenueNet	$ 499.2us-gaap_SalesRevenueNet	$ 1,862.6us-gaap_SalesRevenueNet	$ 1,863.6us-gaap_SalesRevenueNet	$ 2,087.3us-gaap_SalesRevenueNet
Gross margin	97.0us-gaap_GrossProfit	115.8us-gaap_GrossProfit	104.2us-gaap_GrossProfit	85.8us-gaap_GrossProfit	55.5us-gaap_GrossProfit	48.6us-gaap_GrossProfit	17.2us-gaap_GrossProfit	12.9us-gaap_GrossProfit	402.8us-gaap_GrossProfit	134.2us-gaap_GrossProfit	575.2us-gaap_GrossProfit
Operating income (loss)	40.5us-gaap_OperatingIncomeLoss	60.2us-gaap_OperatingIncomeLoss	46.7us-gaap_OperatingIncomeLoss	22.8us-gaap_OperatingIncomeLoss	(4.2)us-gaap_OperatingIncomeLoss	(42.5)us-gaap_OperatingIncomeLoss	(46.8)us-gaap_OperatingIncomeLoss	(45.2)us-gaap_OperatingIncomeLoss	170.2us-gaap_OperatingIncomeLoss	(138.7)us-gaap_OperatingIncomeLoss	345.4us-gaap_OperatingIncomeLoss
Net income (loss)	13.7us-gaap_ProfitLoss	37.5us-gaap_ProfitLoss	23.7us-gaap_ProfitLoss	4.6us-gaap_ProfitLoss	10.8us-gaap_ProfitLoss	(40.9)us-gaap_ProfitLoss	(48.6)us-gaap_ProfitLoss	(48.2)us-gaap_ProfitLoss	79.5us-gaap_ProfitLoss	(126.9)us-gaap_ProfitLoss	222.1us-gaap_ProfitLoss
Amounts attributable to Valhi stockholders:
Net income (loss) attributable to Valhi stockholders	$ 8.8us-gaap_NetIncomeLoss	$ 28.7us-gaap_NetIncomeLoss	$ 15.5us-gaap_NetIncomeLoss	$ 0.8us-gaap_NetIncomeLoss	$ 15.7us-gaap_NetIncomeLoss	$ (34.2)us-gaap_NetIncomeLoss	$ (39.7)us-gaap_NetIncomeLoss	$ (39.8)us-gaap_NetIncomeLoss	$ 53.8us-gaap_NetIncomeLoss	$ (98.0)us-gaap_NetIncomeLoss	$ 159.8us-gaap_NetIncomeLoss
Net income (loss) per share	$ 0.03us-gaap_EarningsPerShareBasicAndDiluted	$ 0.08us-gaap_EarningsPerShareBasicAndDiluted	$ 0.05us-gaap_EarningsPerShareBasicAndDiluted		$ 0.05us-gaap_EarningsPerShareBasicAndDiluted	$ (0.10)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.12)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.12)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.16us-gaap_EarningsPerShareBasicAndDiluted	$ (0.29)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.47us-gaap_EarningsPerShareBasicAndDiluted

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