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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended |  |  | 12 Months Ended |
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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

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