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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Goodwill |  |
Balance at beginning of period | $ 2,989.0 | $ 2,953.4
Acquisitions | 78.5 | 41.1
Dispositions |  | (1.6)
Purchase accounting adjustments | (1.7) | (4.5)
Foreign currency translation | 41.4 | 0.6
Balance at end of period | 3,107.2 | 2,989.0
AmeriGas Propane |  |
Goodwill |  |
Balance at beginning of period | 1,978.3 | 1,956.0
Acquisitions | 23.0 | 24.2
Dispositions |  | 0.0
Purchase accounting adjustments | 0.0 | (1.9)
Foreign currency translation | 0.0 | 0.0
Balance at end of period | 2,001.3 | 1,978.3
UGI International |  |
Goodwill |  |
Balance at beginning of period | 817.0 | 803.7
Acquisitions | 55.5 | 16.9
Dispositions |  | (1.6)
Purchase accounting adjustments | (1.7) | (2.6)
Foreign currency translation | 41.4 | 0.6
Balance at end of period | 912.2 | 817.0
Midstream & Marketing |  |
Goodwill |  |
Balance at beginning of period | 11.6 | 11.6
Acquisitions | 0.0 | 0.0
Dispositions |  | 0.0
Purchase accounting adjustments | 0.0 | 0.0
Foreign currency translation | 0.0 | 0.0
Balance at end of period | 11.6 | 11.6
UGI Utilities |  |
Goodwill |  |
Balance at beginning of period | 182.1 | 182.1
Acquisitions | 0.0 | 0.0
Dispositions |  | 0.0
Purchase accounting adjustments | 0.0 | 0.0
Foreign currency translation | 0.0 | 0.0
Balance at end of period | $ 182.1 | $ 182.1

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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