Long-term Debt (Phantom) (Details) (USD $) In Millions, unless otherwise specified
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3 Months Ended |
12 Months Ended |
Mar. 31, 2015
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Dec. 31, 2014
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Debt Instrument [Line Items] |
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Line of Credit Facility, Interest Rate During Period |
0.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod |
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Line of Credit [Member] |
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Debt Instrument [Line Items] |
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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 |
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Debt Instrument [Line Items] |
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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 |
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Debt Instrument [Line Items] |
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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 |
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Debt Instrument [Line Items] |
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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 |
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Debt Instrument [Line Items] |
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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 |
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Debt Instrument [Line Items] |
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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 |