Condensed Consolidated Statements Of Changes In Equity (USD $) In Millions		Total		Southeast Texas [Member]		East Texas System [Member]	Mont Belvieu Fractionators [Member]	Successor [Member]	Predecessor Equity [Member]	Common Unitholders [Member]	Common Unitholders [Member] Southeast Texas [Member]	Common Unitholders [Member] East Texas System [Member]	Common Unitholders [Member] Mont Belvieu Fractionators [Member]	Common Unitholders [Member] Successor [Member]	General Partner [Member]	General Partner [Member] Successor [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Successor [Member]
Beginning Balance at Dec. 30, 2010		$ 1,076.0							$ 337.8	$ 552.2					$ (6.4)		$ (27.7)	$ 220.1
Net change in parent advances		19.0							19.0
Acquisition of Southeast Texas		(114.3)							(114.3)
Excess purchase price over acquired assets		(35.7)								(34.8)							(0.9)
Issuance of 3,941,667 and 11,031,691 common units for September 2011 and 2012 respectively		152.2								152.2
Equity-based compensation		2.9								2.9
Distributions to DCP Midstream, LLC		(2.6)								(2.6)
Distributions to unitholders and general partner		(97.5)	[1]							(80.5)					(17.0)
Distributions to noncontrolling interests		(26.8)	[1]															(26.8)
Contributions from DCP Midstream, LLC		9.1																9.1
Net income attributable to predecessor operations		14.3							14.3
Net income		129.0	[2]	25.8	[3]			114.7						83.4		18.5			12.8
Reclassification of cash flow hedges into earnings		15.6	[2]														15.6
Net unrealized losses on cash flow hedges		(10.5)	[2]						(0.7)								(9.8)
Total comprehensive income		134.1	[2]						13.6	83.4					18.5		5.8	12.8
Ending Balance at Sep. 30, 2011		1,116.4							256.1	672.8					(4.9)		(22.8)	215.2
Beginning Balance at Jun. 30, 2011
Net income attributable to predecessor operations		2.2
Net income		68.1	[4]	5.3	[3]
Reclassification of cash flow hedges into earnings	[4]	5.2
Net unrealized losses on cash flow hedges		(5.5)	[4]						(0.3)
Total comprehensive income	[4]	67.5
Ending Balance at Sep. 30, 2011		1,116.4							256.1
Beginning Balance at Dec. 31, 2011		1,098.3	[5]	359.0	[3]				257.4	654.4					(4.7)		(21.2)	212.4
Net change in parent advances		(11.5)							(11.5)
Acquisition of Southeast Texas	[6]	(29.8)
Acquisition of additional 66.67% interest in Southeast Texas and NGL Hedge		(208.4)							(247.9)	39.5
Acquisition of additional 49.9% interest in East Texas		(175.8)																(175.8)
Issuance of units				48.0		33.0	60.0				48.0	33.0	60.0
Deficit purchase price under carrying value of acquired net assets for Southeast Texas and East Texas		31.6								35.8							(4.2)
Excess purchase price over carrying value of acquired net assets for Mont Belvieu fractionators							(170.2)						(170.2)
Issuance of 3,941,667 and 11,031,691 common units for September 2011 and 2012 respectively		445.2								445.2
Equity-based compensation		(0.4)								(0.4)
Distributions to unitholders and general partner		(128.7)	[6]							(103.0)					(25.7)
Distributions to noncontrolling interests		(4.8)	[6]															(4.8)
Contributions from DCP Midstream, LLC		10.2								10.2
Net income attributable to predecessor operations		2.6							2.6
Net income		105.7	[6]					103.1						71.7		29.4			2.0
Reclassification of cash flow hedges into earnings		9.9	[6]														9.9
Net unrealized losses on cash flow hedges		(0.6)							(0.6)
Total comprehensive income		115.0	[6]						2.0	71.7					29.4		9.9	2.0
Ending Balance at Sep. 30, 2012		$ 1,141.5								$ 1,124.2					$ (1.0)		$ (15.5)	$ 33.8

[1] The financial information during the nine months ended September 30, 2011 includes the results of Southeast Texas, a transfer of net assets between entities under common control that was accounted for as if the transfer occurred at the beginning of the period, and prior years are retrospectively adjusted to furnish comparative information similar to the pooling method.

[2] The financial information for the nine months ended September 30, 2011 includes the results of Southeast Texas, a transfer of net assets between entities under common control that was accounted for as if the transfer occurred at the beginning of the period, and prior years are retrospectively adjusted to furnish comparative information similar to the pooling method.

[3] Adjustments to present Southeast Texas on a consolidated basis at 100% ownership, including commodity derivatives.

[4] The financial information for the three months ended September 30, 2011 includes the results of Southeast Texas, a transfer of net assets between entities under common control that was accounted for as if the transfer occurred at the beginning of the period, and prior years are retrospectively adjusted to furnish comparative information similar to the pooling method.

[5] The financial information as of December 31, 2011 includes the results of Southeast Texas, a transfer of net assets between entities under common control that was accounted for as if the transfer occurred at the beginning of the period, and prior years are retrospectively adjusted to furnish comparative information similar to the pooling method.

[6] The financial information for the nine months ended September 30, 2012 includes the results of Southeast Texas, a transfer of net assets between entities under common control that was accounted for as if the transfer occurred at the beginning of the period, and prior years are retrospectively adjusted to furnish comparative information similar to the pooling method.