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Commitments and Contingencies (Details) |  | 3 Months Ended | 12 Months Ended | 20 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 07, 2017 | Dec. 31, 2018 USD ($) subsidiary lb | Dec. 31, 2017 USD ($) record_of_decision | Jul. 01, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies |  |  |  |  |  |
Capital contributions |  | $ 0 |  |  |  |
Amount of propane in cylinders before reduction (in pounds) | lb |  | 17 |  |  |  |
Amount of propane in cylinders after reduction (in pounds) | lb |  | 15 |  |  |  |
UGI Gas | Environmental Matters |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Environmental expenditures cap during calendar year |  | $ 5,400,000 |  |  |  |
CPG, PNG and UGI Gas COAs |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Accrual for environmental loss contingencies |  | $ 50,500,000 | $ 53,400,000 |  | $ 51,000,000 |
UGI Utilities | PNG and CPG |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Number of subsidiaries acquired with similar histories | subsidiary |  | 2 |  |  |  |
AmeriGas OLP | Saranac Lake, New York | New York State Department of Environment Conservation Remediation Plan |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  | $ 7,500,000 |  |  |
Loss contingency, number of remediation plans | record_of_decision |  |  | 3 |  |  |
Estimated remediation plan cost |  |  |  |  |  | $ 27,700,000
Capital Unit, Class B |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Weighted average price of common units, volume, period | 20 days |  |  |  |  |
Basis spread on dividend yield | 1.30% |  |  |  |  |
Conversion of stock, period subsequent to initial issuance, election one | 5 years |  |  |  |  |
Conversion of stock, conversion ratio | 1 |  |  |  |  |
Conversion of stock, period subsequent to initial issuance, election two | 6 years |  |  |  |  |
Minimum | Capital Unit, Class B |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Conversion of stock, closing trading price, percentage | 110.00% |  |  |  |  |
Forecast |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |
Capital contributions |  |  |  | $ 225,000,000 |  |

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