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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019 | Oct. 25, 2018
Derivative [Line Items] |  |  |  |  |  |
Potential exposure coverage, percent | $ 3,500,000 |  | $ 3,500,000 |  |  |
Pre-tax losses associated with net investment hedges | 11,900,000 | $ 16,400,000 | (8,500,000) | $ 10,300,000 |  |
Interest Rate Protection Agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Foreign Exchange Forward |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
International local currency earnings before income taxes | 90.00% |  | 90.00% |  |  |
UGI International LLC | 3.25% Senior Unsecured Notes Due November 2025 | Senior Notes |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 3.25%

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