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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 03, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Total - gross book value $ 1,239.5us-gaap_PropertyPlantAndEquipmentGross $ 1,285.9us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (534.9)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (527.5)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total net book value 704.6us-gaap_PropertyPlantAndEquipmentNet 758.4us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total - gross book value 69.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
73.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total - gross book value 258.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_BuildingsAndLeaseholdImprovementsMember
270.3us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_BuildingsAndLeaseholdImprovementsMember
Machinery, Equipment and Office Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Total - gross book value 880.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_MachineryEquipmentAndOfficeFurnishingsMember
905.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_MachineryEquipmentAndOfficeFurnishingsMember
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total - gross book value $ 31.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 36.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember