Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 105.7	[1]	$ 129.0	[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	49.6	[1]	74.9	[2]
Earnings from unconsolidated affiliates	(16.6)	[1]	(17.1)	[2]
Distributions from unconsolidated affiliates	15.9		19.8
Net unrealized gains on derivative instruments	(18.9)	[3]	(47.3)	[3]
Other, net	1.5		3.2
Change in operating assets and liabilities, which provided (used) cash net of effects of acquisitions:
Accounts receivable	83.4		53.2
Inventories	16.3		(2.8)
Accounts payable	(95.7)		(26.2)
Accrued interest	11.6		2.2
Other current assets and liabilities	7.4		(5.3)
Other long-term assets and liabilities	(1.4)		(2.6)
Net cash provided by operating activities	158.8	[1]	181.0	[4]
INVESTING ACTIVITIES:
Capital expenditures	(152.5)	[1]	(98.5)	[4]
Acquisitions, net of cash acquired	(375.4)		(60.6)
Acquisition of unconsolidated affiliate	(29.8)	[1]	(114.3)
Investments in unconsolidated affiliates	(86.3)	[1]	(6.8)	[4]
Return of investment from unconsolidated affiliate	1.0	[1]	1.6	[4]
Proceeds from sale of assets	0.2	[1]	0.2	[4]
Net cash used in investing activities	(642.8)	[1]	(278.4)	[4]
FINANCING ACTIVITIES:
Proceeds from debt	1,353.4	[1]	832.0	[4]
Payments of debt	(1,062.0)	[1]	(754.0)	[4]
Payment of deferred financing costs	(3.5)	[1]	(0.1)	[4]
Excess purchase price over acquired assets			(35.7)
Proceeds from issuance of common units, net of offering costs	445.2	[1]	152.0	[4]
Net change in advances to predecessor from DCP Midstream, LLC	(11.5)	[1]	14.6	[4]
Distributions to unitholders and general partner	(128.7)	[1]	(97.5)	[4]
Distributions to noncontrolling interests	(4.8)	[1]	(26.8)	[4]
Net cash provided by financing activities	484.8	[1]	93.6	[4]
Net change in cash and cash equivalents	0.8	[1]	(3.8)	[4]
Cash and cash equivalents, beginning of period	7.6	[1],[5]	6.7	[4]
Cash and cash equivalents, end of period	8.4	[1]	2.9	[4]
Cash Portion [Member]
FINANCING ACTIVITIES:
Excess purchase price over acquired assets	(110.2)		(35.7)
Contributions from DCP Midstream, LLC	$ 6.9	[1]	$ 9.1	[4]

[1] 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.

[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] Non-cash derivative mark-to-market is included in segment gross margin, along with cash settlements for our derivative contracts.

[4] 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.

[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.