Long-Term Debt (Indebtedness Table) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 ENLC Credit Facility [Member]	Jun. 30, 2014 2.7% Senior Notes due 2019 [Member]	Jun. 30, 2014 7.125% Senior Notes due 2022 [Member]		Jun. 30, 2014 4.4% Senior Notes due 2024 [Member]	Jun. 30, 2014 Unsecured Debt [Member]	Jun. 30, 2014 Other Debt Obligations [Member]	Jul. 20, 2014 Senior Unsecured Debt Due 2022 [Member] Subsequent Event [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding			$ 160,000,000	$ 95,000,000						$ 23,200,000
Senior Notes					397,200,000	224,900,000	[1]	446,400,000	346,700,000
Long-term Debt	1,693,800,000									23,600,000
Current portion of long-term debt	(18,500,000)	0									(18,500,000)
Long-term Debt, Excluding Current Maturities	$ 1,675,300,000	$ 0

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