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AmeriGas Merger and Acquisitions - Total Cash Paid and Liabilities Incurred (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) mi | Sep. 30, 2018 USD ($) mi MW | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Natural gas lines, acquired (in miles) | mi | 21 | 60 |
Payments to acquire long-term investments | $ 20.0 | $ 70.3 |
Natural gas-fired peaking turbine, acquired (mw) | MW |  | 44 |
UGI International |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid | 49.3 | $ 121.9 | $ 99.7
Liabilities incurred | 0.0 | 0.0 | 20.6
Total purchase price | 49.3 | 121.9 | 120.3
Midstream & Marketing |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid | 15.0 |  |
Liabilities incurred | 0.0 |  |
Total purchase price | $ 15.0 |  |
AmeriGas Propane |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid |  | 10.1 | 36.8
Liabilities incurred |  | 2.7 | 10.8
Total purchase price |  | $ 12.8 | $ 47.6

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