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Investment in Unconsolidated Affiliates Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended | 3 Months Ended | 5 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Og and E [Member] | Sep. 30, 2013 Og and E [Member] | Sep. 30, 2013 Operating Costs Charged [Member] Og and E [Member] | Sep. 30, 2013 Operating Costs Charged [Member] Og and E [Member] | Sep. 30, 2013 Natural Gas Transportation [Member] Og and E [Member] | Sep. 30, 2013 Natural Gas Transportation [Member] Og and E [Member] | Sep. 30, 2013 Natural Gas Storage [Member] Og and E [Member] | Sep. 30, 2013 Natural Gas Storage [Member] Og and E [Member] | Sep. 30, 2013 Natural Gas Purchases [Member] Og and E [Member] | Sep. 30, 2013 Natural Gas Purchases [Member] Og and E [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from unconsolidated affiliates | $ 17.4 | $ 17.4 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  | 6.6 | 10.9 |  |  |  |  |  |  |  |
Related Party Transaction, Due from (to) Related Party |  |  |  |  |  |  |  |  |  |  |  | 1.4 |  | 1.4 |
Electricity to power electric compression assets |  |  |  | 3.9 | 5.2 |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  |  |  |  |  |  | $ 8.7 | $ 14.5 | $ 3.1 | $ 5.4 | $ 9.4 | [1] | $ 11.9 | [1]
[1] | At September 30, 2013, there was $1.4 million of natural gas purchases recorded for these activities.

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References 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 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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