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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets, Customer Relationships) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortized intangible assets $ 168.4us-gaap_FiniteLivedIntangibleAssetsGross $ 139.5us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization (99.8)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (85.8)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Foreign currency translation adjustment (4.2)bgc_FiniteLivedIntangibleAssetsForeignCurrencyTranslationAdjustment (1.6)bgc_FiniteLivedIntangibleAssetsForeignCurrencyTranslationAdjustment
Total Amortized intangible assets $ 64.4us-gaap_FiniteLivedIntangibleAssetsNet $ 52.1us-gaap_FiniteLivedIntangibleAssetsNet