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Additional investment in alternative energy sector.

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Amount of propane in cylinders being sold.

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Approximate remediation cost spent by claimant.

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Commitments and Contingencies.

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Commitments and Contingencies.

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Environmental exit cost anticipated by claimant.

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Environmental exit cost based on third party estimate.

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Number of residential customer.

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Percentage of costs associated with sites.

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Percentage of responsible for cleanup cost.

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Provision on distribution business in foreign country competition authority matter in foreign currency.

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Provision on distribution business in foreign country competition authority matter in local currency.

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Reduced amount of propane in cylinders being sold.

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Term for operating lease arrangements.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Commitments and Contingencies (Details Textual) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended																1 Months Ended
	Jul. 31, 2011 Customer	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2011 Gas Utility [Member]	Sep. 30, 2011 Midstream & Marketing [Member]	Sep. 30, 2011 Partnership [Member]	Sep. 30, 2008 Partnership [Member]	Sep. 30, 2011 International Propane, Antargaz [Member]	Sep. 30, 2011 Maximum [Member]	Sep. 30, 2011 Minimum [Member]	Sep. 30, 2011 CPG MGP Properties [Member] USD ($)	Sep. 30, 2011 PNG MGP Properties [Member] USD ($)	Sep. 30, 2011 UGI Utilities [Member] Claims	Sep. 22, 2006 UGI Utilities [Member]	Sep. 30, 2006 SCE & G [Member] USD ($)	Sep. 22, 2006 SCE & G [Member] USD ($)	Jun. 30, 2006 KeySpan [Member] USD ($)	Jun. 30, 2004 KeySpan [Member] USD ($)	Jun. 24, 2004 KeySpan [Member]	Sep. 11, 2006 Northeast Companies [Member] USD ($)	Dec. 31, 2010 Antargaz Competition Authority [Member] USD ($)	Jun. 30, 2009 Antargaz Competition Authority [Member] USD ($)	Jun. 30, 2009 Antargaz Competition Authority [Member] EUR (€)
Commitments and Contingencies [Line Items]
Environmental exit cost anticipated by claimant																	$ 14		$ 11		$ 25
Term for operating lease arrangements										P3Y	P1Y
Term of contracts					Not exceeding one year	Less than two years	less than one year		not exceeding one years
Environmental expenditures												1.8	1.1
Approximate remediation cost spent by claimant																22.0			2.3
Litigating claims relating to out of state sites														3
Percentage of costs associated with sites															25.00%
Third party claim relating to the site																	26
Percentage of responsible for cleanup cost																				50.00%
Environmental exit cost based on third party estimate																		10
Additional environment exit cost based on claimant estimate																		20
Amount of propane in cylinders being sold								17
Reduced amount of propane in cylinders being sold								15
Provision for Antargaz Competition Authority matter in US $																							10.0
Provision for Antargaz Competition Authority Matter Euros																								7.1
Reversal of competition authority matter accrual																						9.4
Commitments and Contingencies (Textual) [Abstract]
Aggregate rental expense for leases		69.8	70.6	70.1
Additional investment in limited partnership		8.5
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA		$ 17.9	$ 21.4
Number of residential customer	400