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Summary of Significant Accounting Policies - Basis of Presentation (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) subsidiary | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Decrease in opening retained earnings |  | $ (2,106.7) | $ (1,834.1)
Increase in other noncurrent liabilities |  | 774.8 | 806.6
Decrease in deferred income tax liabilities |  | $ (1,357.0) | $ (1,212.4)
UGI International | Error in Cylinder Deposit Liability |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Number of subsidiaries | subsidiary | 2 |  |
UGI International | Error in Cylinder Deposit Liability | Restatement Adjustment |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Decrease in opening retained earnings | $ 6.8 |  |
Decrease in opening retained earnings (as a percent) | 0.50% |  |
Increase in other noncurrent liabilities | $ 10.6 |  |
Decrease in deferred income tax liabilities | $ 3.8 |  |

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