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Long-term Debt (Phantom) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Line of Credit Facility, Interest Rate During Period 0.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod  
Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Interest Rate During Period 1.60%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
1.90%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2.7% Senior Notes due 2019    
Debt Instrument [Line Items]    
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
Debt Instrument, Unamortized Discount (Premium), Net (0.5)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A2.7SeniorNotesdue2019Member
(0.5)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A2.7SeniorNotesdue2019Member
7.125% Senior Notes due 2022    
Debt Instrument [Line Items]    
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
Debt Instrument, Unamortized Discount (Premium), Net 21.1us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A7.125SeniorNotesdue2022Member
21.9us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A7.125SeniorNotesdue2022Member
4.4% Senior Notes due 2024    
Debt Instrument [Line Items]    
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
Debt Instrument, Unamortized Discount (Premium), Net 3.1us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A4.4SeniorNotesdue2024Member
3.2us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A4.4SeniorNotesdue2024Member
5.6% Senior Notes due 2044    
Debt Instrument [Line Items]    
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
Debt Instrument, Unamortized Discount (Premium), Net (0.3)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.6SeniorNotesdue2044Member
(0.3)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.6SeniorNotesdue2044Member
5.05% Senior Notes due 2045    
Debt Instrument [Line Items]    
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
Debt Instrument, Unamortized Discount (Premium), Net (1.6)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.05SeniorNotesdue2045Member
(1.7)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= enlc_A5.05SeniorNotesdue2045Member