Affiliate Transactions Affiliate Transactions (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		7 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended							9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 07, 2014	Dec. 31, 2013	Sep. 30, 2014 Northridge Assets [Member]	Sep. 30, 2014 Northridge Assets [Member]	Sep. 30, 2013 Devon Energy Corporation [Member]	Sep. 30, 2014 Devon Energy Corporation [Member]	Sep. 30, 2013 Devon Energy Corporation [Member]	Sep. 30, 2014 Affiliated Entity [Member]	Sep. 30, 2014 Sales Revenue, Net [Member]	Sep. 30, 2014 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Sep. 30, 2014 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Discontinued Operations [Member]	Sep. 30, 2014 Discontinued Operations [Member]	Sep. 30, 2013 Discontinued Operations [Member]	Sep. 30, 2013 Discontinued Operations [Member] Devon Energy Corporation [Member]	Sep. 30, 2014 Discontinued Operations [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Discontinued Operations [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Discontinued Operations [Member] Affiliated Entity [Member]	Sep. 30, 2014 Discontinued Operations [Member] Affiliated Entity [Member]	Sep. 30, 2013 Discontinued Operations [Member] Affiliated Entity [Member]	Sep. 30, 2013 Continuing Operations [Member] Devon Energy Corporation [Member]	Sep. 30, 2014 Continuing Operations [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Continuing Operations [Member] Devon Energy Corporation [Member]	Sep. 30, 2013 Continuing Operations [Member] Affiliated Entity [Member]	Sep. 30, 2014 Continuing Operations [Member] Affiliated Entity [Member]	Sep. 30, 2013 Continuing Operations [Member] Affiliated Entity [Member]	Sep. 30, 2014 Bridgeport [Member]	Sep. 30, 2014 Oklahoma City [Member]	Sep. 30, 2014 Cresson [Member]	Sep. 30, 2014 Gulf Coast Fractionators	Mar. 07, 2014 Gulf Coast Fractionators	Sep. 30, 2014 EnLink Midstream Holdings, LP [Member]
Related Party Transaction [Line Items]
Revenues	$ (647,700,000)	$ (46,800,000)	$ (1,635,200,000)	$ (136,100,000)								$ (435,600,000)												$ (20,800,000)	$ (10,400,000)	$ (68,100,000)				$ (531,400,000)	$ (436,400,000)	$ (1,557,000,000)
Operating Expenses																								7,800,000	5,000,000	25,400,000				417,500,000	340,000,000	1,229,600,000
Net Cash Provided by (Used in) Financing Activities			262,800,000	(117,700,000)																				(400,000)	0	(5,600,000)
Net Related Party transactions																								(13,400,000)	(5,400,000)	(48,300,000)				(113,900,000)	(96,400,000)	(327,400,000)
Business Acquisition, Percentage of Voting Interests Acquired					50.00%
Gross Profit	187,200,000	106,900,000	517,900,000	297,500,000			6,500,000	22,300,000
Equity Method Investment, Ownership Percentage																																				38.75%	38.75%
Capital Expenditures	207,400,000	37,100,000	493,500,000	172,600,000																				(100,000)	600,000	5,300,000				44,700,000	16,200,000	201,300,000
Other Expenses																								(73,500,000)	400,000	(54,600,000)				(50,800,000)	53,000,000	8,400,000
Total Third-Party Transactions																								(73,600,000)	1,000,000	(49,300,000)				(6,100,000)	69,200,000	209,700,000
Net distributions from (to) related party		(207,000,000)	(95,000,000)	(215,300,000)														(87,000,000)	(4,400,000)	(97,600,000)				(87,000,000)	(44,300,000)	(97,600,000)	(120,000,000)	(27,200,000)	(117,700,000)	(120,000,000)	(50,700,000)	(117,700,000)
Net distributions from (to) related party, non-cash																					0	(39,900,000)	0							0	(23,500,000)	0
Business Acquisition, Date of Acquisition Agreement																																						Mar. 07, 2014
Concentration Risk, Percentage													10.00%	24.10%	91.90%	34.80%	92.00%
Due from Affiliate, Current	113,200,000		113,200,000
Related party payables	3,800,000		3,800,000			0
Cost of Share-based Compensation	5,800,000	3,500,000	15,600,000	10,100,000					3,500,000	2,800,000	10,100,000
Pension and Other Postretirement Benefit Expense									2,200,000	1,600,000	6,100,000
Operating Leases, Rent Expense																																	$ 174,000	$ 31,000	$ 66,000