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Derivative Instruments and Hedging Activities, Balance Sheet Presentation Related to Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 Enogex [Member] | Dec. 31, 2012 Enogex [Member] Designated as Hedging Instrument [Member] | Dec. 31, 2012 Enogex [Member] Designated as Hedging Instrument [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Other Current Assets [Member] | Dec. 31, 2012 Enogex [Member] Not Designated as Hedging Instrument [Member] | Dec. 31, 2012 Enogex [Member] Not Designated as Hedging Instrument [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Current PRM [Member] | Dec. 31, 2012 Enogex [Member] Not Designated as Hedging Instrument [Member] Natural gas [Member] Fixed Swaps/Futures [Member] Other Current Assets [Member] | Dec. 31, 2012 Enogex [Member] Not Designated as Hedging Instrument [Member] Natural gas [Member] Physical [Member] Current PRM [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Assets | $ 0 | $ 5.5 | [1] | $ 0 | $ 0 | $ 5.5 | $ 0.1 | $ 5.0 | $ 0.4
Liabilities |  | $ 5.5 | [1] | $ 0.5 | $ 0.5 | $ 5.0 | $ 0 | $ 4.7 | $ 0.3
[1] | See Note 4 for a reconciliation of the Company's total derivatives fair value to the Company's Condensed Consolidated Balance Sheet at December 31, 2012.

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