Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 88.5	$ 434.2
Other comprehensive income (loss):
Net losses on derivative instruments (net of tax of $0.4 and $0.2, respectively)	(1.5)	(0.4)
Reclassifications of net losses (gains) on derivative instruments (net of tax of $(0.3) and $0.1, respectively)	0.7	(0.4)
Foreign currency adjustments (net of tax of $2.8 and $0.0, respectively)	(15.6)	22.3
Benefit plans (net of tax of $(0.1), and $(0.2), respectively)	0.3	0.4
Other comprehensive (loss) income	(16.1)	21.9
Comprehensive income including noncontrolling interests	72.4	456.1
Deduct comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(24.3)	(68.3)
Comprehensive income attributable to UGI Corporation	$ 48.1	$ 387.8