Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12

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Derivative

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Disclosures About Derivative Instruments and Hedging Activities.

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Partnership long term debt not issued.

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Loss as a result of the discontinuance of cash flow hedge accounting.

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Maximum approximate range of estimated purchases of product.

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Maximum length of time hedged in price risk cash flow hedges.

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Minimum approximate range of estimated purchases of product.

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Transmission Organisation controls movements of wholesale electricity in number of states.

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Weighted Average Length of Time Hedged in Price Risk Cash Flow Hedge.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Regulation S-X (SX)
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-Section 02
-Paragraph 22
-Article 5

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-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
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-Publisher FASB
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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 45
-Subparagraph b(2)
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-SubTopic 30
-Section 50
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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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- Definition

Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
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Disclosures About Derivative Instruments and Hedging Activities (Details Textual) In Millions, unless otherwise specified	9 Months Ended					9 Months Ended															9 Months Ended					9 Months Ended		9 Months Ended
	Jun. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Jun. 30, 2010 USD ($)	Jun. 30, 2011 Gas Utility [Member] Dekatherm	Jun. 30, 2010 Gas Utility [Member] Dekatherm	Jun. 30, 2010 AmeriGas Propane [Member] USD ($)	Jun. 30, 2011 Electric Utility - Forward Contract [Member] USD ($) Kilowatt-hour	Sep. 30, 2010 Electric Utility - Forward Contract [Member] USD ($)	Jun. 30, 2011 Midstream And Marketing's Natural Gas Member Dekatherm	Jun. 30, 2011 Midstream And Marketing's Propane Storage [Member] Gallons	Jun. 30, 2011 Electric transmission congestion - Electric Utility [Member] Kilowatt-hour	Jun. 30, 2010 Electric transmission congestion - Electric Utility [Member] Kilowatt-hour	Jun. 30, 2011 Electric transmission congestion (excluding Electric Utility) [Member] Kilowatt-hour	Jun. 30, 2010 Electric transmission congestion (excluding Electric Utility) [Member] Kilowatt-hour	Jun. 30, 2011 LPG [Member] Gallons	Jun. 30, 2010 LPG [Member] Gallons	Jun. 30, 2011 Natural Gas [Member] Dekatherm	Jun. 30, 2010 Natural Gas [Member] Dekatherm	Jun. 30, 2011 Electricity (millions of kilowatt-hours) Kilowatt-hour	Jun. 30, 2010 Electricity (millions of kilowatt-hours) Kilowatt-hour	Jun. 30, 2011 Antargaz [Member] EUR (€)	Jun. 30, 2011 Net Investment Hedges [Member] EUR (€)	Jun. 30, 2010 Net Investment Hedges [Member] EUR (€)	Jun. 30, 2011 Interest Rate Swaps [Member] EUR (€)	Jun. 30, 2010 Interest Rate Swaps [Member] EUR (€)	Jun. 30, 2011 Foreign Currency [Member] USD ($)	Jun. 30, 2010 Foreign Currency [Member] USD ($)	Jun. 30, 2011 IRPAs [Member] USD ($)	Mar. 31, 2010 IRPAs [Member] USD ($)
Derivative (Textual) [Abstract]
Notional amount (in units)				18,600,000	11,300,000		874,400,000		2,300,000	900,000	287,300,000	739,300,000	1,955,200,000	1,415,000,000	145,000,000	150,500,000	21,200,000	33,300,000	1,200,800,000	928,000,000
Maximum length of time hedged in price risk cash flow hedges				16 months			35 months						11 months		15 months		30 months		21 months							32 months
Maximum length of time hedged in price risk cash flow hedges																						March 2014
Maximum period of hedging exposure to variability in cash flows associated with price risk, weighted average															7 months		9 months		7 months							12 months
Underlying variable rate debt																					€ 0	€ 14.5	€ 48.3	€ 398.8	€ 706.2	$ 141.4	$ 72.8	$ 173.0
Debt Instrument Maturity Date																					Mar. 01, 2011
Loss as a result of the discontinuance of cash flow hedge accounting						12.2																						12.2
Minimum approximate range of estimated dollar-denominated purchases of LPG																										15.00%
Maximum approximate range of estimated dollar-denominated purchases of LPG																										30.00%
Long term debt not issued																													150
Fair values of electric utility's forward purchase power agreements	33.5		60.0				10.1	19.7
Disclosures About Derivative Instruments and Hedging Activities (Textuals) [Abstract]
Net losses associated with commodity price risk hedges expected to be reclassified into earnings during the next twelve months	8.7
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months	1.7
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months	4.0
Restricted Cash in brokerage accounts	$ 10.2	$ 34.8	$ 22.9
Transmission organization that movements of wholesale electricity in number of states	14