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Property, Plant and Equipment (Property, Plant and Equipment, Gross) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 1,390.8us-gaap_PropertyPlantAndEquipmentGross $ 1,369.0us-gaap_PropertyPlantAndEquipmentGross
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 15.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
15.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 410.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
397.5us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Buildings and Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P5Y  
Buildings and Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P50Y  
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 654.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
655.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Machinery and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P10Y  
Machinery and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P15Y  
Molds and Dies [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 94.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
95.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ToolsDiesAndMoldsMember
Molds and Dies [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P4Y  
Molds and Dies [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P7Y  
Computer Hardware and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 111.3us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wst_ComputerHardwareAndSoftwareMember
107.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wst_ComputerHardwareAndSoftwareMember
Computer Hardware and Software [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P3Y  
Computer Hardware and Software [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P10Y  
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 104.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 97.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember