Fair Value Measurement (Textual) (Details) (USD $)	Jun. 30, 2014		Mar. 07, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 1,693,800,000
7.125% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Senior Notes	224,900,000	[1]
Debt Instrument, Interest Rate, Stated Percentage	7.125%		7.125%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	160,000,000
ENLC Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	95,000,000
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	23,600,000
Line of Credit Facility, Amount Outstanding	23,200,000
2.7% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Senior Notes	397,200,000
Debt Instrument, Interest Rate, Stated Percentage	2.70%
4.4% Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	446,400,000
Debt Instrument, Interest Rate, Stated Percentage	4.40%
5.6% Senior Notes due 2044 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 346,700,000
Debt Instrument, Interest Rate, Stated Percentage	5.60%

[1] On July 20, 2014, the Partnership redeemed 18.5 million aggregate principal amount of the 2022 Notes.