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Contingencies (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  | 9 Months Ended |
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Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Sep. 30, 2011 Pending or Threatened Litigation [Member] Natural gas gathering operations [Member] | Apr. 20, 2011 Pending or Threatened Litigation [Member] Natural gas gathering operations [Member] | Oct. 31, 2010 Pending or Threatened Litigation [Member] Natural gas gathering operations [Member] | Sep. 30, 2010 Pending or Threatened Litigation [Member] Natural gas gathering operations [Member] | Sep. 19, 2011 Pending or Threatened Litigation [Member] Guarantee obligation under construction contract [Member] | Dec. 31, 2009 Pending or Threatened Litigation [Member] Guarantee obligation under construction contract [Member] | Jul. 31, 2007 Pending or Threatened Litigation [Member] Guarantee obligation under construction contract [Member] | Sep. 30, 2011 Pending or Threatened Litigation [Member] Litigation related to construction materials [Member] | Jan. 18, 2011 Pending or Threatened Litigation [Member] Litigation related to construction materials [Member] | Aug. 03, 2011 Pending or Threatened Litigation [Member] Natural gas distribution [Member] | Sep. 30, 2011 Portland Harbor Site [Member] | Sep. 30, 2011 Environmental Litigation Number 1 [Member] | Sep. 30, 2011 Environmental Litigation Number 2 [Member] | Sep. 30, 2011 Environmental Litigation Number 3 [Member] | Sep. 30, 2011 Performance Guarantee [Member] | Sep. 30, 2011 Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential liabilities related to litigation and environmental matters | $ 40,600,000 | $ 45,300,000 |  |  |  | $ 26,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Bicent's bank letter of credit guaranteeing CEM's obligation |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |
Amount of compensatory damages in LPP's notice of demand |  |  |  |  |  |  |  |  | 149,700,000 |  |  |  |  |  |  |  |  |  |
Estimated damages in pending litigation, low estimate |  |  |  | 18,800,000 |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |
Estimated damages in pending litigation, high estimate |  |  |  | 22,600,000 |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |
Amount Of Damages Dismissed In Pending Litigation |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Estimated Damages Including Interest In Amended Complaint |  |  |  |  |  |  |  |  |  |  | 21,900,000 |  |  |  |  |  |  |  |
Amount of natural gas gathering contract dispute charged to operations and maintenance, before tax |  |  |  |  |  |  | 26,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of natural gas gathering contract dispute charged to operation and maintenance expense, after tax |  |  | 16,500,000 |  |  |  | 16,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Legal Fees And Expenses Awarded In Litigation |  |  |  |  | 293,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment to be made pursuant to settlement agreement |  |  |  |  |  |  |  |  |  |  |  |  | 425,000 |  |  |  |  |  |
Suspended Penalties Required If Noncompliant (up to) |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |
Amount of counterclaim related to costs of defending LPP arbitration demand |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated investigative costs (in excess of) |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |
Site Contingency, Loss Exposure Not Accrued, Low Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Site Contingency, Loss Exposure Not Accrued, High Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |
Site Contingency, Loss Exposure, Low Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 340,000 |  |  |
Site Contingency, Loss Exposure, High Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,400,000 |  |  |
Reserve for environmental remediation of manufactured gas plant site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,400,000 |  |  |
Site Contingency, Loss Exposure Not Accrued, Best Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |
Estimated proportional share of clean-up liability (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,000,000 |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,800,000 |
2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |
Amount Outstanding Under Guarantees That Is Reflected On Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Expires on a specified number of days after the receipt of written notice |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600,000 |
No scheduled maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,400,000
Letters of credit set to expire in 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700,000
Letters of credit set to expire in 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,700,000
Natural gas transportation and storage agreement fixed maximum amount of performance guarantee of a related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
The amount outstanding by a related party under the guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |
Amount of surety bonds outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 569,000,000 |

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