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Disclosures About Derivative Instruments and Hedging Activities (Details) (Designated as Hedging Instrument [Member]) | Dec. 31, 2012 gal | Dec. 31, 2011 gal
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LPG (millions of gallons) [Member] |  |
Outstanding derivative commodity instruments volumes |  |
Outstanding derivative commodity instruments volumes | 212,100,000 | 125,400,000
Natural gas (millions of dekatherms) [Member] |  |
Outstanding derivative commodity instruments volumes |  |
Outstanding derivative commodity instruments volumes | 21,100,000 | 28,000,000
Electricity (millions of kilowatt-hours) [Member] | Forward Purchase Contracts [Member] |  |
Outstanding derivative commodity instruments volumes |  |
Outstanding derivative commodity instruments volumes | 1,180,800,000 | 1,538,300,000
Electricity (millions of kilowatt-hours) [Member] | Forward Sales Contracts [Member] |  |
Outstanding derivative commodity instruments volumes |  |
Outstanding derivative commodity instruments volumes | 195,300,000 | 175,400,000

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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