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Inventories, Net - Inventories, Net (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Raw materials $ 79.4us-gaap_InventoryRawMaterialsNetOfReserves $ 70.2us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 43.2us-gaap_InventoryWorkInProcessNetOfReserves 24.7us-gaap_InventoryWorkInProcessNetOfReserves
Finished products 256.4us-gaap_InventoryFinishedGoodsNetOfReserves 266.3us-gaap_InventoryFinishedGoodsNetOfReserves
Supplies 64.0us-gaap_InventorySuppliesNetOfReserves 69.4us-gaap_InventorySuppliesNetOfReserves
Total 443.0us-gaap_InventoryNet 430.6us-gaap_InventoryNet
Chemicals    
Inventory [Line Items]    
Raw materials 76.0us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ChemicalsMember
66.6us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ChemicalsMember
Work in process 32.9us-gaap_InventoryWorkInProcessNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ChemicalsMember
18.0us-gaap_InventoryWorkInProcessNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ChemicalsMember
Finished products 253.2us-gaap_InventoryFinishedGoodsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ChemicalsMember
263.3us-gaap_InventoryFinishedGoodsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ChemicalsMember
Component Products    
Inventory [Line Items]    
Raw materials 3.4us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ComponentProductsMember
3.6us-gaap_InventoryRawMaterialsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ComponentProductsMember
Work in process 10.3us-gaap_InventoryWorkInProcessNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ComponentProductsMember
6.7us-gaap_InventoryWorkInProcessNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ComponentProductsMember
Finished products $ 3.2us-gaap_InventoryFinishedGoodsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ComponentProductsMember
$ 3.0us-gaap_InventoryFinishedGoodsNetOfReserves
/ us-gaap_StatementBusinessSegmentsAxis
= vhi_ComponentProductsMember