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Commitments and Contingencies - UGI Standby Commitment to Purchase Class B Common Units (Details) - USD ($) $ in Millions |  | 20 Months Ended
--- | --- | ---
Nov. 07, 2017 | Jul. 01, 2019
Subsequent Event | Capital B Units |  |
Other Commitments [Line Items] |  |
Number of volume days of weighted average price of Partnership's common units | 20 days |
Basis points on annualized yield | 1.30% |
Period from initial issuance, holders may elect to convert units | 5 years |
Conversion ratio | 1 |
Period from initial issuance, holders may elect to convert subject to certain conditions | 6 years |
Subsequent Event | Capital B Units | Minimum |  |
Other Commitments [Line Items] |  |
Trading price (as a percent) | 110.00% |
Forecast |  |
Other Commitments [Line Items] |  |
Amount of capital contribution |  | $ 225

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