Affiliate Transactions Affiliate Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended		4 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended							6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 07, 2014	Dec. 31, 2013	Jun. 30, 2013 Devon Energy Corporation [Member]	Jun. 30, 2014 Devon Energy Corporation [Member]	Jun. 30, 2013 Devon Energy Corporation [Member]	Jun. 30, 2014 Affiliated Entity [Member]	Jun. 30, 2014 Sales Revenue, Net [Member]	Jun. 30, 2014 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Jun. 30, 2014 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Sales Revenue, Net [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Discontinued Operations [Member]	Jun. 30, 2014 Discontinued Operations [Member]	Jun. 30, 2013 Discontinued Operations [Member]	Jun. 30, 2013 Discontinued Operations [Member] Devon Energy Corporation [Member]	Jun. 30, 2014 Discontinued Operations [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Discontinued Operations [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Discontinued Operations [Member] Affiliated Entity [Member]	Jun. 30, 2014 Discontinued Operations [Member] Affiliated Entity [Member]	Jun. 30, 2013 Discontinued Operations [Member] Affiliated Entity [Member]	Jun. 30, 2013 Continuing Operations [Member] Devon Energy Corporation [Member]	Jun. 30, 2014 Continuing Operations [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Continuing Operations [Member] Devon Energy Corporation [Member]	Jun. 30, 2013 Continuing Operations [Member] Affiliated Entity [Member]	Jun. 30, 2014 Continuing Operations [Member] Affiliated Entity [Member]	Jun. 30, 2013 Continuing Operations [Member] Affiliated Entity [Member]	Jun. 30, 2014 Bridgeport [Member]	Jun. 30, 2014 Oklahoma City [Member]	Jun. 30, 2014 Cresson [Member]	Jun. 30, 2014 Gulf Coast Fractionators	Mar. 07, 2014 Gulf Coast Fractionators	Jun. 30, 2014 EnLink Midstream Holdings, LP [Member]
Related Party Transaction [Line Items]
Revenues	$ (755.0)	$ (47.5)	$ (987.5)	$ (89.3)						$ (229.3)												$ (24.2)	$ (10.4)	$ (47.3)				$ (540.5)	$ (436.4)	$ (1,025.6)
Operating Expenses																						9.3	5.0	17.6				430.9	340.0	812.1
Related Party Transaction, Amounts of Transaction																						(18.1)	(5.4)	(34.9)				(109.6)	(96.4)	(213.5)
Net Cash Provided by (Used in) Financing Activities			180.8	2.3																		(3.2)	0	(5.2)
Business Acquisition, Percentage of Voting Interests Acquired					50.00%
Equity Method Investment, Ownership Percentage																																		38.75%	38.75%
Capital Expenditures	215.6	52.3	283.6	135.5																		2.7	0.6	5.4				56.7	21.3	156.6
Other Expenses																						17.4	0.4	18.9				14.0	53.0	59.2
Total Third-Party Transactions																						20.1	1.0	24.3				70.7	74.3	215.8
Net distributions from (to) related party		36.9	89.6	8.3												(2.0)	4.4	10.6				(2.0)	44.3	10.6	38.9	22.1	(2.3)	(38.9)	(45.3)	2.3
Net distributions from (to) related party, non-cash																			0	39.9	0							0	(23.2)	0
Business Acquisition, Date of Acquisition Agreement																																				Mar. 07, 2014
Concentration Risk, Percentage											10.00%	18.70%	92.00%	40.30%	92.00%
Due from Affiliate, Current	111.4		111.4
Accounts Payable, Related Parties	6.0		6.0			0
Cost of Share-based Compensation	5.8	3.5	9.8	6.7			3.5	2.8	6.7
Pension and Other Postretirement Benefit Expense							1.8	1.6	3.9
Operating Leases, Rent Expense																															$ 0.2	$ 0	$ 0.1