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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 25, 2018 | Oct. 18, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
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Derivative [Line Items] |  |  |  |  |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | $ 3,500,000 |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 1,400,000 |  |  |  |  |  |
Restricted cash | 17,400,000 |  |  |  | $ 9,600,000 | $ 19,800,000 | $ 10,300,000
Interest Rate Protection Agreements |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount | $ 0 |  |  |  | $ 0 | $ 0 |
UGI International LLC | 3.25% Senior Unsecured Notes Due November 2025 | Senior Notes |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 3.25% |  |  |  |
UGI International LLC | EURIBOR | UGI International Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, fixed interest rate |  | 0.34% |  | 0.34% |  |  |
Maximum | UGI Utilities | Unsecured Debt |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, fixed interest rate | 3.00% |  |  |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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