Condensed Consolidated Statements of Operations Condensed Consolidated Statements of Operations (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Cost of Purchased Oil and Gas	$ 538.9	$ 395.4
General and Administrative Expense	15.7	10.2
Customer [Member]
Cost of Purchased Oil and Gas	325.8	362.2
Operating Expenses	5.9	8.9
General and Administrative Expense	$ 8.3	$ 10.1

Cost of oil and gas purchased during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

Name:	us-gaap_CostOfPurchasedOilAndGas
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration