Consolidated Statements of Changes in Members Equity - USD ($) $ in Millions	VEX Pipeline Devon Energy Corporation	VEX Pipeline	Common Units	Devon Energy Corporation	Non-Controlling Interest	Total
Member equity, beginning balance (Predecessor) at Dec. 31, 2013						$ 1,783.7
Member equity, beginning balance at Dec. 31, 2013						1,783.7
Increase (Decrease) in Members' Equity
Distributions to the Predecessor | Predecessor						(71.9)
Distributions to the Predecessor						(71.9)
Issuance of units for reorganization of predecessor equity | Predecessor						(1,747.3)
Issuance of units for reorganization of predecessor equity			$ 941.7		$ 805.6
Issuance of units for reorganization of predecessor equity (in units)			115,500,000
Issuance of common units for acquisition of Company			$ 1,822.6		2,847.7	4,670.3
Issuance of common units for acquisition of Company (in units)			48,500,000
Elimination of deferred taxes attributable to non-controlling interest in predecessor equity					204.9	204.9
Issuance of common units by the Partnership					412.0	412.0
Change in equity due to issuance of units by the Partnership			$ (1.1)		1.8	0.7
Conversion of restricted units for common, net of units withheld for taxes			$ (1.2)		0.1	(1.1)
Conversion of restricted units for common, net of units withheld for taxes (in units)			100,000
Non-controlling partner's impact of conversion of restricted units and options					(0.3)	(0.3)
Unit-based compensation			$ 10.6		9.0	19.6
Distribution to members			(89.0)			(89.0)
Distribution to non-controlling interest					(204.3)	(204.3)
Purchase of non-controlling interest			0.2		(12.7)	(12.5)
Non-controlling interest contribution					6.3	6.3
Acquisition	$ 105.7	$ 105.7
Net income (loss) | Predecessor						35.5
Net income (loss)			90.5	$ (2.0)	126.7	250.7
Member equity, end balance at Dec. 31, 2014			$ 2,774.3	103.7	4,196.8	7,074.8
Units outstanding, end balance (in units) at Dec. 31, 2014			164,100,000
Increase (Decrease) in Members' Equity
Issuance of common units by the Partnership					384.4	384.4
Change in equity due to issuance of units by the Partnership			$ 8.5		(13.7)	(5.2)
Conversion of restricted units for common, net of units withheld for taxes			$ (2.9)			(2.9)
Conversion of restricted units for common, net of units withheld for taxes (in units)			100,000
Non-controlling partner's impact of conversion of restricted units and options					(2.5)	(2.5)
Unit-based compensation			$ 18.5		17.6	36.1
Distribution to members			(162.8)			(162.8)
Distribution to non-controlling interest					(359.5)	(359.5)
Non-controlling interest contribution					(16.4)	(16.4)
Adjustment related to mandatory redemption of E2 non- controlling interest					(5.4)	(5.4)
Redeemable non-controlling interest					(7.0)	(7.0)
Contributions from Devon to the Company			7.1			7.1
Contribution from Devon to the Partnership				25.6	2.2	27.8
Distribution attributable to VEX interests transferred (Note 3)				(131.1)	(35.6)	(166.7)
Net income (loss)			(357.0)	$ 1.8	(1,054.5)	(1,409.7)
Member equity, end balance at Dec. 31, 2015			$ 2,285.7		3,139.2	$ 5,424.9
Units outstanding, end balance (in units) at Dec. 31, 2015			164,200,000			164,242,160
Increase (Decrease) in Members' Equity
Issuance of common units by the Partnership					167.5	$ 167.5
Issuance of Preferred Units by the Partnership					724.1	724.1
Change in equity due to issuance of units by the Partnership			$ 11.8		(18.9)	(7.1)
Conversion of restricted units for common, net of units withheld for taxes			$ (1.2)			(1.2)
Conversion of restricted units for common, net of units withheld for taxes (in units)			200,000
Non-controlling partner's impact of conversion of restricted units and options					(1.2)	(1.2)
Unit-based compensation			$ 15.1		15.2	30.3
Distribution to members			(185.4)			(185.4)
Distribution to non-controlling interest					(382.4)	(382.4)
Non-controlling interest contribution					167.9	167.9
Contributions from Devon to the Company					1.5	1.5
Issuance of common units			$ 214.9			214.9
Issuance of common units (in units)			15,600,000
Net income (loss)			$ (460.0)		(428.2)	(888.2)
Member equity, end balance at Dec. 31, 2016			$ 1,880.9		$ 3,384.7	$ 5,265.6
Units outstanding, end balance (in units) at Dec. 31, 2016			180,000,000			180,049,316