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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total — gross book value $ 1,285.9us-gaap_PropertyPlantAndEquipmentGross $ 1,830.3us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (527.5)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (738.3)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total — net book value 758.4us-gaap_PropertyPlantAndEquipmentNet 1,092.0us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total — gross book value 73.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
120.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total — gross book value 270.3us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_BuildingsAndLeaseholdImprovementsMember
372.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_BuildingsAndLeaseholdImprovementsMember
Machinery, Equipment and Office Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Total — gross book value 905.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_MachineryEquipmentAndOfficeFurnishingsMember
1,290.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bgc_MachineryEquipmentAndOfficeFurnishingsMember
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total — gross book value $ 36.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 46.3us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember