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Disclosures About Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Designated as Hedging Instrument [Member] | LPG (millions of gallons) [Member] |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |
Outstanding derivative commodity instruments volumes | 236,700,000 | 231,900,000 | 236,700,000 | 231,900,000
Designated as Hedging Instrument [Member] | Natural gas (millions of dekatherms) [Member] |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |
Outstanding derivative commodity instruments volumes | 19,400,000 | 21,200,000 | 19,400,000 | 21,200,000
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 | 927,200,000 | 1,688,400,000 | 927,200,000 | 1,688,400,000
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 | 451,000,000 | 131,800,000 | 451,000,000 | 131,800,000
Cash Flow Hedges [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Gain Loss Recognized in Other Comprehensive Income and Noncontrolling Interests Effective Portion | $ (9.1) | $ (72.8) | $ (6.5) | $ (192.4)
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 | $ 14.0 | $ (16.6) | $ 23.0 | $ (29.0)

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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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