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Long-Term Debt (Schedule of Latin America Credit Facilities) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Outstanding borrowings $ 1,337.4us-gaap_LongTermDebt $ 1,386.9us-gaap_LongTermDebt
Maturities within one year 403.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
Latin America [Member] | Credit Facilities [Member]    
Outstanding borrowings 238.6us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
179.6us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
Undrawn availability 79.6us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
204.4us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
Interest rate — weighted average 6.10%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
4.20%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember
Maturity Date Various Various
Maturities within one year $ 228.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_CreditFacilityAxis
= bgc_CreditFacilitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LatinAmericaMember