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Fair Value Disclosure (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 28, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill impairment charge $ 155.1us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss  
Intangible asset impairment charges 98.8us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill  
Asset impairment charges 158.3us-gaap_AssetImpairmentCharges 14.0us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges  
July 2014 Restructuring Program [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cost incurred to date 117.5us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= bgc_July2014RestructuringProgramMember
     
Venezuela [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset impairment charges 29.3us-gaap_AssetImpairmentCharges
/ us-gaap_StatementGeographicalAxis
= country_VE
     
BRAZIL [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Asset impairment charges 13.1us-gaap_AssetImpairmentCharges
/ us-gaap_StatementGeographicalAxis
= country_BR
     
PDIC [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill impairment charge 155.1us-gaap_GoodwillImpairmentLoss
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
    155.1us-gaap_GoodwillImpairmentLoss
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
Intangible asset impairment charges $ 93.4us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
    $ 93.4us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember