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Long-term Borrowings (Details) | 12 Months Ended |  |  |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  | 0 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2014 AmeriGas Propane USD ($) | Sep. 30, 2013 AmeriGas Propane USD ($) | Sep. 30, 2014 AmeriGas Propane Senior Notes USD ($) | Sep. 30, 2013 AmeriGas Propane Senior Notes USD ($) | Jan. 12, 2012 AmeriGas Propane Senior Notes USD ($) | Sep. 30, 2014 AmeriGas Propane Senior Notes Maximum | Jun. 30, 2012 AmeriGas Propane Senior Notes 7.00% Senior Notes, due 2022 USD ($) | Sep. 30, 2012 AmeriGas Propane Senior Notes 7.00% Senior Notes, due 2022 USD ($) | Sep. 30, 2014 AmeriGas Propane Senior Notes 7.00% Senior Notes, due 2022 USD ($) | Sep. 30, 2013 AmeriGas Propane Senior Notes 7.00% Senior Notes, due 2022 USD ($) | Jan. 12, 2012 AmeriGas Propane Senior Notes 7.00% Senior Notes, due 2022 USD ($) | Sep. 30, 2014 AmeriGas Propane Senior Notes 6.75% Senior Notes, due 2020 USD ($) | Sep. 30, 2013 AmeriGas Propane Senior Notes 6.75% Senior Notes, due 2020 USD ($) | Jan. 12, 2012 AmeriGas Propane Senior Notes 6.75% Senior Notes, due 2020 | Mar. 28, 2012 AmeriGas Propane Senior Notes 6.50% Senior Notes, due 2021 | Sep. 30, 2014 AmeriGas Propane Senior Notes 6.50% Senior Notes, due 2021 USD ($) | Sep. 30, 2013 AmeriGas Propane Senior Notes 6.50% Senior Notes, due 2021 USD ($) | Mar. 28, 2012 AmeriGas Propane Senior Notes 6.50% Senior Notes, due 2021 USD ($) | Sep. 30, 2014 AmeriGas Propane Senior Secured Notes HOLP Senior Secured Notes USD ($) | Sep. 30, 2013 AmeriGas Propane Senior Secured Notes HOLP Senior Secured Notes USD ($) | Sep. 30, 2014 Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 USD ($) | Sep. 30, 2014 Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 EUR (€) | Sep. 30, 2013 Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 USD ($) | Sep. 30, 2014 Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 Minimum | Sep. 30, 2014 Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 Maximum | Sep. 30, 2013 Flaga Notes Payable to Banks Flaga Term Loan, due September 2016 USD ($) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due September 2016 USD ($) | Sep. 30, 2013 Flaga Notes Payable to Banks Flaga Term Loan, due October 2016 USD ($) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due October 2016 USD ($) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due October 2016 EUR (€) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due October 2016 Minimum | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due October 2016 Maximum | Sep. 30, 2013 Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 USD ($) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 USD ($) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 EUR (€) | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 Minimum | Sep. 30, 2014 Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 Maximum | Sep. 30, 2014 UGI Utilities USD ($) | Sep. 30, 2013 UGI Utilities USD ($) | Mar. 31, 2014 UGI Utilities Senior Notes 4.98% Senior Notes due 2044 USD ($) | Sep. 30, 2014 UGI Utilities Senior Notes 4.98% Senior Notes due 2044 USD ($) | Mar. 31, 2016 Forecast Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 USD ($) | Mar. 31, 2016 Forecast Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 EUR (€) | May 31, 2015 Forecast Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 USD ($) | May 31, 2015 Forecast Antargaz Notes Payable to Banks Antargaz Senior Facilities Term Loan, due 2016 EUR (€) | Sep. 30, 2016 Forecast Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 USD ($) | Sep. 30, 2016 Forecast Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 EUR (€) | Aug. 31, 2016 Forecast Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 USD ($) | Aug. 31, 2016 Forecast Flaga Notes Payable to Banks Flaga Term Loan, due through September 2016 EUR (€)
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | $ 3,510,800,000 | $ 3,609,400,000 |  | $ 2,291,700,000 | $ 2,300,100,000 | $ 450,000,000 | $ 450,000,000 |  |  |  |  | $ 980,800,000 | $ 980,800,000 |  | $ 550,000,000 | $ 550,000,000 |  |  | $ 270,000,000 | $ 270,000,000 |  | $ 26,500,000 | $ 32,000,000 | $ 432,000,000 | € 342,000,000 | $ 514,000,000 |  |  | $ 52,000,000 | $ 52,000,000 | $ 25,800,000 | $ 24,100,000 | € 19,100,000 |  |  | $ 54,100,000 | $ 50,500,000 | € 40,000,000 |  |  | $ 642,000,000 | $ 642,000,000 | $ 175,000,000 |  |  |  |  |  | $ 16,800,000 | € 13,300,000 | $ 33,700,000 | € 26,700,000
Principal repayments due in 2015 | 76,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,200,000 | 34,200,000 |  |  |  |
Principal repayments due in 2016 | 748,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 388,800,000 | 307,800,000 |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | 550,000,000 |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate stated percentage |  |  |  |  |  | 6.25% |  |  |  | 7.00% |  | 7.00% |  | 7.00% | 6.75% |  | 6.75% |  | 6.50% |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.98% |  |  |  |  |  |  |  |  |
Percentage of Redemption at Option |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed Debt |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Tendered for Redemption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 383,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Aggregate Amount Outstanding Tendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Outstanding Before Redemption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 470,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Value of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early Redemption Percentage of Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Proration Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | 242,600,000 | 168,700,000 | 299,900,000 |  |  |  |  |  |  | 19,200,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt | 0 | 0 | 13,300,000 |  |  |  |  |  |  |  | 13,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Net Income Attributable to Company |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on Term Loan Base Rate Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  | 117.50% | 252.50% |  |  |  | 1.125% | 2.55% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.89% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.87% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  | 4.79% | 4.79% | 4.41% |  |  | 1.82% | 1.82% | 3.85% | 3.40% | 3.40% |  |  | 4.68% | 4.25% | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on Credit Agreement Base Rate Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective EURIBOR Rate of Interest on Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.45% | 2.45% |  |  |  |  |  | 1.79% |  |  |  |  | 2.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective EURIBOR Rate of Interest on Term Loan Thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.71% | 3.71% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of Net Debt to EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50 | 3.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |
Ratio of Consolidated Debt to Consolidated Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |
Amount of Net Assets Restricted from Transfer to Parent Company under Different Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |

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