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Acquisitions of Businesses and Assets - Total Cash Paid and Liabilities Incurred (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2018 USD ($) propane_distribution_business mi MW | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Natural gas lines, acquired | mi | 60 |  |
Natural gas-fired peaking turbine, acquired | MW | 44 |  |
Payments to acquire long-term investments | $ 70.3 |  |
AmeriGas Propane |  |  |
Business Acquisition [Line Items] |  |  |
Retail propane distribution businesses acquired | propane_distribution_business | 2 |  |
Total cash paid | $ 10.1 | $ 36.8 | $ 37.6
Liabilities incurred | 2.7 | 10.8 | 11.8
Total purchase price | 12.8 | 47.6 | 49.4
UGI International |  |  |
Business Acquisition [Line Items] |  |  |
Total cash paid | 121.9 | 99.7 | 24.1
Liabilities incurred | 0.0 | 20.6 | 0.0
Total purchase price | $ 121.9 | $ 120.3 | $ 24.1

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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