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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod    
Cash received from stock option exercises $ 0.3us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions $ 0.7us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions $ 0.1us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Tax deductions for all share-based compensation 7.0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 5.0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions  
Excess tax benefit on share-based compensation (0.5)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet [1] (0.7)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet [1] (0.6)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet [1]
Weighted average fair value of options granted   $ 18.60bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageOfOptionsGranted $ 18.20bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageOfOptionsGranted
Number of shares authorized 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax deductions for all share-based compensation 0.1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0.1us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Weighted average fair value of options granted   $ 35.24bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageOfOptionsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 32.50bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageOfOptionsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Intrinsic value of options exercised 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
1.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Fair value of shares vested 25.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
20.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
18.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Compensation cost related to nonvested options not yet recognized 1.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
4.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Weighted average recognition period 1 year 2 months 12 days 1 year 10 months 24 days  
Nonvested Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Restricted Stock and Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of shares vested 8.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
6.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
7.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
Compensation cost related to nonvested options not yet recognized 14.7us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
   
Weighted average recognition period 1 year 10 months 27 days    
Nonvested stock and restricted stock units 321,000bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAndRestrictedStockUnitsNumber
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
   
Weighted average grant price, per share expected to vested in next year $ 29.90bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedYearOneWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
   
Fair value of shares expected to vested in next year $ 9.6bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodYearOneTotalFairValue
/ us-gaap_AwardTypeAxis
= bgc_RestrictedStockAndRestrictedStockUnitsRsusMember
   
2005 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares to be granted 5,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= bgc_StockIncentivePlan2005Member
   
Shares reserved for future grants 1,800,000bgc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForFutureGrants
/ us-gaap_PlanNameAxis
= bgc_StockIncentivePlan2005Member
   
2005 Plan [Member] | Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Expiration period 10 years    
2000 Plan [Member] | Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Expiration period 10 years    
1997 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 4,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bgc_StockInsentivePlan1997Member
   
1997 Plan [Member] | Nonvested Stock [Member] | From Second to Sixth Anniversary of Date of Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 6 years    
1997 Plan [Member] | Nonvested Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 3 years    
1997 Plan [Member] | Nonvested Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 5 years    
[1] Cash inflows (outflows) recognized as financing and operating activities in the Company’s consolidated statement of cash flows