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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Goodwill
Balance at beginning of period	$ 3,160.4	$ 3,107.2
Acquisitions	355.5	59.4
Dispositions		(2.8)
Purchase accounting adjustments		13.6
Foreign currency translation	(59.5)	(17.0)
Balance at end of period	3,456.4	3,160.4
AmeriGas Propane
Goodwill
Balance at beginning of period	2,003.0	2,001.3
Acquisitions		4.5
Dispositions		(2.8)
Foreign currency translation	0.0	0.0
Balance at end of period	2,003.0	2,003.0
UGI International
Goodwill
Balance at beginning of period	963.7	912.2
Acquisitions	25.6	54.9
Dispositions		0.0
Purchase accounting adjustments		13.6
Foreign currency translation	(59.5)	(17.0)
Balance at end of period	929.8	963.7
Midstream & Marketing
Goodwill
Balance at beginning of period	11.6	11.6
Acquisitions	329.9	0.0
Dispositions		0.0
Purchase accounting adjustments		0.0
Foreign currency translation	0.0	0.0
Balance at end of period	341.5	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
Foreign currency translation	0.0	0.0
Balance at end of period	$ 182.1	$ 182.1

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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