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Derivatives (Details Textuals) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Maximum counterparty loss $ 21.9enlc_MaximumPotentialExposureToCreditLossesGrossExposure
Maximum counterparty loss with netting feature $ 17.4enlc_MaximumPotentialExposureToCreditLossesNetExposure