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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
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

X

- 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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Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ugi_OutstandingDerivativeCommodityInstrumentsVolumesAbstract
Namespace Prefix:	ugi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration