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Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) county state segment | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Number of states to which product sale with propane revenue | state |  |  |  |  |  |  |  |  | 50 |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | $ | $ (99.0) | $ 9.6 | $ 538.8 | $ 167.7 | $ 49.2 | $ 29.5 | $ 591.0 | $ 395.0 | $ 617.1 | $ 1,064.7 | $ 1,010.0
Number of counties |  |  |  |  |  |  |  |  | 1 |  |
UGI Utilities |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Number of counties |  |  |  |  |  |  |  |  | 2 |  |
France | Geographic Concentration Risk | Revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 20.00% |  |
France | Geographic Concentration Risk | Long-lived Assets |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 10.00% |  |

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