Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified			3 Months Ended					12 Months Ended
	Jun. 06, 2006 Key Span [Member]	Jun. 24, 2004 Key Span [Member]	Dec. 31, 2012 Environmental matters [Member]	Dec. 31, 2012 Environmental matters [Member] CPG MGP [Member]	Dec. 31, 2012 Environmental matters [Member] PNG MGP [Member]	Dec. 31, 2012 CPG and PNG COAs [Member] UGI Utilities [Member]	Dec. 31, 2011 CPG and PNG COAs [Member] UGI Utilities [Member]	Sep. 30, 2008 CA cylinder investigation [Member] Partnership [Member] lb	Sep. 30, 2008 FTC Investigation [Member] Partnership [Member] lb	Dec. 31, 2012 BP Matter [Member] Partnership [Member] Customer
Commitments and Contingencies [Line Items]
Environmental expenditures cap during calendar year				$ 1.8	$ 1.1
Accrual for environmental loss contingencies						15.0	17.8
Base year for determination of investigation and remediation cost (in years)			5 years
Percentage of costs associated with sites (as a percent)		50.00%
Approximate remediation cost spent by claimant		2.3
Environmental exit cost anticipated by claimant		11
Environmental exit cost based on third party estimate	10
Additional environment exit cost based on claimant estimate	$ 20
Amount of propane in cylinders before reduction (in pounds)								17	17
Amount of propane in cylinders after reduction (in pounds)								15	15
Alleged number of residential customers (in customers)										400