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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Oct. 25, 2018 | Sep. 30, 2018
Derivative [Line Items] |  |  |  |  |
Potential exposure coverage, percent | $ 3,500,000 |  |  |  |
Pre-tax losses associated with net investment hedges | 20,400,000 | $ 6,100,000 |  |  |
Derivative collateral, right to reclaim cash | 8,900,000 | 10,000,000.0 | $ 29,300,000 |  |
Restricted cash | 95,800,000 | 17,400,000 | 63,700,000 |  | $ 9,600,000
Interest Rate Protection Agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 0 | $ 0 | $ 0 |  |
Foreign Exchange Forward |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
International local currency earnings before income taxes | 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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