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Disclosures About Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Designated as Hedging Instrument [Member] | LPG (millions of gallons) [Member] |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |
Outstanding derivative commodity instruments volumes | 129,400,000 | 146,800,000 | 129,400,000 | 146,800,000
Designated as Hedging Instrument [Member] | Natural gas (millions of dekatherms) [Member] |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |
Outstanding derivative commodity instruments volumes | 17,300,000 | 22,800,000 | 17,300,000 | 22,800,000
Designated as Hedging Instrument [Member] | Electricity (millions of kilowatt-hours) [Member] | Forward Purchase Contracts [Member] |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |
Outstanding derivative commodity instruments volumes | 1,034,400,000 | 1,793,900,000 | 1,034,400,000 | 1,793,900,000
Designated as Hedging Instrument [Member] | Electricity (millions of kilowatt-hours) [Member] | Forward Sales Contracts [Member] |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |
Outstanding derivative commodity instruments volumes | 449,900,000 | 153,600,000 | 449,900,000 | 153,600,000
Cash Flow Hedges [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Gain Loss Recognized in Other Comprehensive Income and Noncontrolling Interests Effective Portion | $ 16.1 | $ (54.7) | $ 2.6 | $ (119.6)
Interest Rate Contracts [Member] | Cash Flow Hedges [Member] | Interest Expense/Other Income [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Gain Loss Recognized in Other Comprehensive Income and Noncontrolling Interests Effective Portion | $ 8.0 | $ (2.8) | $ 9.0 | $ (12.5)

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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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- Definition Derivative instruments gain loss recognized in other comprehensive income and noncontrolling interests effective portion. + References No definition available. + Details
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