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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (51.9) |  | $ (51.9) |  | $ (49.1)
Amounts reclassified from accumulated other comprehensive income (loss) | (0.9) | (0.8) | (2.8) | (2.3) |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 3.3 |  |
Deconsolidation of Enogex Holdings | 0 | 0 | 6.1 | 0 |
Deconsolidation of Enogex Holdings |  |  | (6.1) |  |
Net current period other comprehensive income (loss) |  |  | (2.8) |  |
Commodity Contract [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (0.4) |  | (0.4) |  | 0.1
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.2 |  |
Deconsolidation of Enogex Holdings |  |  | (0.7) |  |
Net current period other comprehensive income (loss) |  |  | (0.5) |  |
Interest Rate Swap [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (0.3) |  | (0.3) |  | (0.5)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.2 |  |
Deconsolidation of Enogex Holdings |  |  | 0 |  |
Net current period other comprehensive income (loss) |  |  | 0.2 |  |
Noncontrolling Interest [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0 |  | 0 |  | (9.0)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.1 |  |
Deconsolidation of Enogex Holdings |  |  | 8.9 |  |
Net current period other comprehensive income (loss) |  |  | 9.0 |  |
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan Income Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | (43.7) |  | (43.7) |  | (49.3)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 2.8 |  |
Deconsolidation of Enogex Holdings |  |  | 2.8 |  |
Net current period other comprehensive income (loss) |  |  | 5.6 |  |
Pension Plans, Defined Benefit [Member] | Defined Benefit Plan Prior Service Cost [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | 0.1 |  | 0.1 |  | 0.1
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0 |  |
Deconsolidation of Enogex Holdings |  |  | 0 |  |
Net current period other comprehensive income (loss) |  |  | 0 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Defined Benefit Plan Income Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | (13.1) |  | (13.1) |  | (15.7)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 1.6 |  |
Deconsolidation of Enogex Holdings |  |  | 1.0 |  |
Net current period other comprehensive income (loss) |  |  | 2.6 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Defined Benefit Plan Prior Service Cost [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | 5.5 |  | 5.5 |  | 7.2
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (1.4) |  |
Deconsolidation of Enogex Holdings |  |  | (0.3) |  |
Net current period other comprehensive income (loss) |  |  | $ (1.7) |  |

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994 + Details
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- Definition The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j-k) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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