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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 lawsuit | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2014 CPG MGP Properties | Sep. 30, 2014 PNG MGP Properties | Sep. 30, 2008 Partnership lb | Sep. 30, 2014 Environmental Issue | Sep. 30, 2014 Maximum Gas Utility | Sep. 30, 2014 Maximum Midstream and Marketing | Sep. 30, 2014 Maximum Partnership | Sep. 30, 2014 Maximum UGI International | Sep. 30, 2014 The Partnership and UGI International Minimum | Sep. 30, 2014 The Partnership and UGI International Maximum | Sep. 30, 2014 UGI International Minimum | Sep. 30, 2014 UGI International Maximum
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate rental expense for leases | $ 79.7 | $ 82.5 | $ 77.9 |  |  |  |  |  |  |  |  |  |  |  |
Term of contracts |  |  |  |  |  |  |  | 16 months | 2 years | 3 years | 3 years |  |  |  |
Contract terms subject to annual price and quantity ddjustments (in years) |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years | 1 year | 3 years
Environmental expenditures |  |  |  | 1.8 | 1.1 |  |  |  |  |  |  |  |  |  |
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA | $ 10.7 | $ 14.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Base year for determination of investigation and remediation cost (in years) |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Amount of propane in cylinders being sold |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |
Reduced amount of propane in cylinders being sold |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |
Loss Contingency Class Action Lawsuit | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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