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Employee Incentive Plan (Compensation Schedule) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
ENLK Restricted Units | Restricted Stock Units (RSUs)
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Paid for Tax Withholding for Share Based Compensation 16,471
Number of Units  
Non-vested, beginning of period (Units) 0
Assumed in Business Combination 371,225
Granted (Units) 701,119
Vested (39,833)
Forfeited (Units) (13,196)
Non-vested, end of period (Units) 1,019,315
Weighted Average Grant-Date Fair Value  
Non-vested, beginning of period $ 0.00
Assumed in Business Combination, price $ 30.51
Granted $ 31.65
Vested $ 30.63
Forfeited $ 31.83
Non-vested, end of period $ 31.27
Aggregate intrinsic value, end of period (in thousands) $ 31.0
ENLC Restricted Units
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Paid for Tax Withholding for Share Based Compensation 24,727
Number of Units  
Non-vested, beginning of period (Units) 0
Assumed in Business Combination 435,674
Granted (Units) 626,341
Vested (59,553)
Forfeited (Units) (11,859)
Non-vested, end of period (Units) 990,603
Weighted Average Grant-Date Fair Value  
Non-vested, beginning of period $ 0.00
Assumed in Business Combination, price $ 37.60
Granted $ 36.59
Vested $ 37.56
Forfeited $ 36.54
Non-vested, end of period $ 36.97
Aggregate intrinsic value, end of period (in thousands) $ 40.9