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Business and Geographic Segments - Segment Operating Performance (Detail) (USD $) In Millions, 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
Segment Reporting Information [Line Items]
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
Cost of sales									1,459.8us-gaap_CostOfGoodsSold		1,729.4us-gaap_CostOfGoodsSold		1,512.1us-gaap_CostOfGoodsSold
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
Equity in earnings of investee											0.5us-gaap_IncomeLossFromEquityMethodInvestments		(0.2)us-gaap_IncomeLossFromEquityMethodInvestments
Securities earnings									26.9us-gaap_InvestmentIncomeNet		26.6us-gaap_InvestmentIncomeNet		50.2us-gaap_InvestmentIncomeNet
Insurance recoveries									10.4us-gaap_InsuranceRecoveries		9.4us-gaap_InsuranceRecoveries		3.3us-gaap_InsuranceRecoveries
Litigation settlement gain													14.7us-gaap_GainLossRelatedToLitigationSettlement
Gain on sale of excess property													3.2us-gaap_GainLossOnSaleOfProperties
Goodwill impairment													(6.4)us-gaap_GoodwillImpairmentLoss
Gain on bargain purchase and remeasurement of our existing investment in acquiree											54.6vhi_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainAndBusinessCombinationBargainPurchaseGainRecognized
General expenses, net									(38.8)us-gaap_OtherGeneralExpense		(105.3)us-gaap_OtherGeneralExpense		(45.3)us-gaap_OtherGeneralExpense
Loss on prepayment of debt, net											(8.9)us-gaap_GainsLossesOnExtinguishmentOfDebt		(7.2)us-gaap_GainsLossesOnExtinguishmentOfDebt
Interest expense									(56.7)us-gaap_InterestExpense		(56.1)us-gaap_InterestExpense		(56.3)us-gaap_InterestExpense
Income (loss) from continuing operations before income taxes									112.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		(217.9)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		301.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Depreciation and amortization									78.4us-gaap_DepreciationAndAmortization		74.5us-gaap_DepreciationAndAmortization		69.4us-gaap_DepreciationAndAmortization
Capital expenditures									72.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		74.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		98.8us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Operating Segment | Chemicals
Segment Reporting Information [Line Items]
Net sales									1,651.9us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		1,732.4us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		1,976.3us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember
Cost of sales									1,304.6us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		1,622.6us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		1,418.2us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember
Gross margin									347.3us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		109.8us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		558.1us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember
Operating income (loss)									156.8us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		(125.4)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		366.8us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember
Depreciation and amortization									51.9us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		52.8us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		50.4us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember
Capital expenditures									61.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		67.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember		74.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ChemicalsMember
Operating Segment | Component Products
Segment Reporting Information [Line Items]
Net sales									103.9us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		92.0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		83.2us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember
Cost of sales									71.6us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		64.5us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		58.9us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember
Gross margin									32.3us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		27.5us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		24.3us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember
Operating income (loss)									13.6us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		9.3us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember		5.4us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember
Depreciation and amortization									3.5us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember	[1]	3.3us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember	[1]	5.8us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember	[1]
Capital expenditures									2.8us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember	[1]	3.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember	[1]	4.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_ComponentProductsMember	[1]
Operating Segment | Waste Management
Segment Reporting Information [Line Items]
Net sales									66.5us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		39.2us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		27.8us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember
Cost of sales									49.7us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		42.3us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		35.0us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember
Gross margin									16.8us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		(3.1)us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		(7.2)us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember
Operating income (loss)									(2.2)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		(22.6)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		(26.8)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember
Depreciation and amortization									20.3us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		18.4us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		13.2us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember
Capital expenditures									4.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		3.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember		19.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_WasteManagementMember
Operating Segment | Real Estate Management And Development
Segment Reporting Information [Line Items]
Net sales									40.3us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_RealEstateManagementAndDevelopmentMember
Cost of sales									33.9us-gaap_CostOfGoodsSold / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_RealEstateManagementAndDevelopmentMember
Gross margin									6.4us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_RealEstateManagementAndDevelopmentMember
Operating income (loss)									2.0us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_RealEstateManagementAndDevelopmentMember
Depreciation and amortization									2.7us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_RealEstateManagementAndDevelopmentMember
Capital expenditures									4.0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = vhi_RealEstateManagementAndDevelopmentMember
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Capital expenditures									$ 0.1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
[1] Includes discontinued operations for 2012, see Note 3.

X

- Definition

Total costs related to goods produced and sold during the reporting period.

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- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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The aggregate gain recognized consisting of: (1) In a business combination achieved in stages, the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination; and (2) In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), the amount of gain recognized by the entity.

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