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Derivative Instruments and Hedging Activities, Balance Sheet Presentation Related to Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Assets | $ 0 |  |
Fair Value Hedging [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value Hedges, Net | 0 | 0 |
Enogex [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 0 |
Liabilities |  | 0.5 |
Enogex [Member] | Designated as Hedging Instrument [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] | Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 0 |
Liabilities |  | 0.5 |
Enogex [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Options [Member] | Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 5.5 | [1]
Liabilities |  | 5.5 | [1]
Enogex [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] | Current PRM [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 0.1 |
Liabilities |  | 0 |
Enogex [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Fixed Swaps/Futures [Member] | Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 5.0 |
Liabilities |  | 4.7 |
Enogex [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Physical [Member] | Current PRM [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 0.4 |
Liabilities |  | 0.3 |
Enogex [Member] | Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Physical [Member] | Noncurrent PRM [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 5.5 |
Liabilities |  | $ 5.0 |
[1] | See Note 5 for a reconciliation of the Company's total derivatives fair value to the Company's Consolidated Balance Sheet at December 31, 2012.

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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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