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Commitments and Contingencies - Contingencies (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) subsidiary lb | Dec. 31, 2017 USD ($) record_of_decision | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Environmental expenditures cap during year | $ 5.4 |  |  |
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA |  |  |  | $ 7.5
Amount of propane in cylinders being sold | lb | 17 |  |  |
Reduced amount of propane in cylinders being sold | lb | 15 |  |  |
CPG, PNG and UGI Gas COAs |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA | $ 51.0 |  | $ 54.3 |
UGI Utilities | CPG and PNG |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
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 [Line Items] |  |  |  |
Number of records of decisions drafted | record_of_decision |  | 3 |  |
Estimated remediation plan cost |  | $ 27.7 |  |

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