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Goodwill And Other Intangible Assets (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
Jun. 27, 2014
Jan. 24, 2014
Feb. 13, 2013
Feb. 12, 2013
Dec. 31, 2011
Amortization of intangible assets $ 14.0us-gaap_AmortizationOfIntangibleAssets $ 12.5us-gaap_AmortizationOfIntangibleAssets $ 11.5us-gaap_AmortizationOfIntangibleAssets            
Estimated amortization expense - 2015 13.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths                
Estimated amortization expense - 2016 12.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo                
Estimated amortization expense - 2017 10.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree                
Estimated amortization expense - 2018 6.3us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour                
Estimated amortization expense - 2019 5.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive                
Estimated amortization expense, thereafter 15.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive                
Exchange rate, currency translation 6.30us-gaap_ForeignCurrencyExchangeRateTranslation1         6.30us-gaap_ForeignCurrencyExchangeRateTranslation1 6.30us-gaap_ForeignCurrencyExchangeRateTranslation1 4.30us-gaap_ForeignCurrencyExchangeRateTranslation1 4.30us-gaap_ForeignCurrencyExchangeRateTranslation1
Goodwill 26.1us-gaap_Goodwill 184.6us-gaap_Goodwill 187.6us-gaap_Goodwill            
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            
PDIC [Member]                  
Goodwill 154.5us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bgc_PDICMember
               
PDIC [Member]                  
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
         
Venezuela [Member]                  
Maximum percent of profit margin that may be allowed due to price controls 30.00%bgc_MaximumPercentofProfitMarginthatMaybeAllowedduetoPriceControls
/ us-gaap_StatementGeographicalAxis
= country_VE
               
Minimum [Member] | Customer Relationships [Member]                  
Finite lived intangible assets useful life 7 years                
Maximum [Member] | Customer Relationships [Member]                  
Finite lived intangible assets useful life 12 years                
Trade Names [Member]                  
Weighted average useful life of the amortized intangible assets 10 years                
Intangible asset impairment charges 95.2us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
[1]                
Latin America [Member]                  
Accumulated goodwill impairment charge 82.6us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
               
Goodwill 3.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
88.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
91.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
           
Latin America [Member] | PDIC [Member]                  
Goodwill impairment charge 82.9us-gaap_GoodwillImpairmentLoss
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
               
Intangible asset impairment charges       69.1us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
         
Latin America [Member] | Trade Names [Member]                  
Accumulated indefinite-lived asset 68.9us-gaap_IndefiniteLivedTradeNames
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
               
Intangible asset impairment charges 68.9us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
[1]                
Latin America [Member] | Trade Names [Member] | PDIC [Member]                  
Finite-lived intangible assets, remaining amortization period 10 years       10 years        
Africa/Asia Pacific [Member]                  
Accumulated goodwill impairment charge 71.9us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
               
Goodwill 6.1us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
78.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
83.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
           
Africa/Asia Pacific [Member] | PDIC [Member]                  
Goodwill impairment charge 72.2us-gaap_GoodwillImpairmentLoss
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
               
Intangible asset impairment charges       24.3us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_ProductOrServiceAxis
= bgc_PDICMember
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
         
Africa/Asia Pacific [Member] | Trade Names [Member]                  
Accumulated indefinite-lived asset 24.2us-gaap_IndefiniteLivedTradeNames
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
               
Intangible asset impairment charges 24.2us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= bgc_AfricaAsiaPacificMember
[1]                
Africa/Asia Pacific [Member] | Trade Names [Member] | PDIC [Member]                  
Finite-lived intangible assets, remaining amortization period 10 years                
North America [Member]                  
Goodwill 17.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
17.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
13.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
           
North America [Member] | Trade Names [Member]                  
Accumulated indefinite-lived asset 2.1us-gaap_IndefiniteLivedTradeNames
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
               
Intangible asset impairment charges $ 2.1us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_NorthAmericaMember
[1]                
[1] The difference in the goodwill and indefinite-lived asset impairment in the above table and the amounts reported in the Consolidated Statements of Operations and Comprehensive Income (Loss) is due to the difference in the average foreign currency exchange rates for the three months ended March 28, 2014 as compared to the spot rates at March 28, 2014 at the various entities within the reporting unit.