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Fair Value Measurement (Details Textuals) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding $ 709.0us-gaap_LineOfCredit  
Long-term Debt 2,493.7us-gaap_LongTermDebt 2,022.5us-gaap_LongTermDebt
Partnership [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding 709.0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_PartnershipMember		 237.0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_PartnershipMember
2.7% Senior Notes due 2019    
Debt Instrument [Line Items]    
Senior Notes 399.5us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A2.7SeniorNotesdue2019Member		 399.5us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A2.7SeniorNotesdue2019Member
Debt Instrument, Interest Rate, Stated Percentage 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A2.7SeniorNotesdue2019Member		 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A2.7SeniorNotesdue2019Member
4.4% Senior Notes due 2024    
Debt Instrument [Line Items]    
Senior Notes 553.1us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A4.4SeniorNotesdue2024Member		 553.2us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A4.4SeniorNotesdue2024Member
Debt Instrument, Interest Rate, Stated Percentage 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A4.4SeniorNotesdue2024Member		 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A4.4SeniorNotesdue2024Member
5.6% Senior Notes due 2044    
Debt Instrument [Line Items]    
Senior Notes 349.7us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.6SeniorNotesdue2044Member		 349.7us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.6SeniorNotesdue2044Member
Debt Instrument, Interest Rate, Stated Percentage 5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.6SeniorNotesdue2044Member		 5.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.6SeniorNotesdue2044Member
5.05% Senior Notes due 2045    
Debt Instrument [Line Items]    
Senior Notes 298.4us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.05SeniorNotesdue2045Member		 298.3us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.05SeniorNotesdue2045Member
Debt Instrument, Interest Rate, Stated Percentage 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.05SeniorNotesdue2045Member		 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.05SeniorNotesdue2045Member
7.125% Senior Notes due 2022    
Debt Instrument [Line Items]    
Senior Notes $ 183.7us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A7.125SeniorNotesdue2022Member		 $ 184.4us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= enlc_A7.125SeniorNotesdue2022Member
Debt Instrument, Interest Rate, Stated Percentage 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A7.125SeniorNotesdue2022Member		 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= enlc_A7.125SeniorNotesdue2022Member