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Debt - Narrative (Details) |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  | $ 0 | $ 33,200,000 |  |  |
Amerigas Propane | Senior Notes | 7.00% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 7.00% |  |  |
Flaga | Term Loan | Flaga Term Loan Due September 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of debt |  | $ 9,200,000 |  |  |  |  |
Line of credit |  |  |  |  |  |  | $ 59,100,000
Flaga | Term Loan | Flaga Term Loan Due September 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit |  |  |  |  |  | $ 49,900,000 |
UGI Utilities | Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 125,000,000 |  |  |  |  |  |
Periodic payment, principal | $ 1,600,000 |  |  |  |  |  |
Minimum | UGI Utilities | Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 0.00% |  |  |  |  |  |
Maximum | UGI Utilities | Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.875% |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 600,000,000 |
Revolving Credit Facility | Line of Credit | UGI International Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | € |  |  |  |  | € 300,000,000 |  |
Required ratio of total indebtedness to EBITDA |  |  | 3.50 |  |  |  |
Letter of Credit | Line of Credit | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 150,000,000 |
Line of Credit | Minimum | AmeriGas OLP | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility fee |  |  | 0.30% |  |  |  |
Line of Credit | Maximum | AmeriGas OLP | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility fee |  |  | 0.50% |  |  |  |
Federal Funds Rate | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |  |  |
Base Rate | Minimum | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |  |  |
Base Rate | Maximum | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.75% |  |  |  |
Eurodollar | Minimum | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.50% |  |  |  |
Eurodollar | Maximum | AmeriGas Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.75% |  |  |  |
EURIBOR | Revolving Credit Facility | Minimum | Line of Credit | UGI International Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.45% |  |  |  |
EURIBOR | Revolving Credit Facility | Maximum | Line of Credit | UGI International Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.35% |  |  |  |
London Interbank Offered Rate (LIBOR) | Minimum | Flaga | Term Loan | Flaga Term Loan Due September 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.125% |  |  |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum | Line of Credit | UGI International Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.70% |  |  |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum | Line of Credit | UGI International Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.60% |  |  |  |

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