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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details Textual) (USD $) In Millions, unless otherwise specified |  |  |  | 0 Months Ended |  |
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Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Oct. 03, 2012 Allentown, Pennsylvania Natural Gas Explosion [Member] UGI Utilities [Member] | Feb. 09, 2011 Allentown, Pennsylvania Natural Gas Explosion [Member] UGI Utilities [Member] Person | Dec. 31, 2012 Allentown Incident [Member] UGI Utilities [Member] | Dec. 31, 2012 Revised Penalty [Member] Allentown Incident [Member] UGI Utilities [Member]
Regulatory Assets [Line Items] |  |  |  |  |  |  |
Gas utility unrealized gains or losses on derivative financial instruments contracts | $ (0.4) | $ 5.3 | $ (2.6) |  |  |  |
Fair Value of Electric Utility Electricity Supply Contracts | 8.2 | 9.2 | 13.5 |  |  |  |
Loss Contingency, Deaths From Natural Gas Explosion |  |  |  |  | 5 |  |
Penalty assessed |  |  |  |  |  | $ 0.4 | $ 0.5
Site Contingency, Accelerated Time Frame Replacing Remainder of Cast-Iron Mains |  |  |  | 14 years |  |  |
Loss Contingency, Agreement Permitted To Retain Current Timeframe for Replacing The Remainder of Their Bare Steel Mains |  |  |  | 30 years |  |  |

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- Definition Fair value of electric utility electricity supply contracts. + References No definition available. + Details
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- Definition Unrealized gains or losses on derivative financial instruments contracts. + References No definition available. + Details
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- Definition Loss Contingency, Agreement Permitted To Retain Current Timeframe for Replacing The Remainder of Their Bare Steel Mains + References No definition available. + Details
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- Definition Loss Contingency, Deaths From Natural Gas Explosion + References No definition available. + Details
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- Definition Penalty assessed + References No definition available. + Details
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- Definition Site Contingency, Accelerated Time Frame Replacing Remainder of Cast-Iron Mains + References No definition available. + Details
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- Details
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