Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 434.2	$ 290.9
Other comprehensive income (loss):
Net (losses) gains on derivative instruments (net of tax of $0.2 and $(6.0), respectively)	(0.4)	12.3
Reclassifications of net gains on derivative instruments (net of tax of $0.1 and $2.1, respectively)	(0.4)	(4.5)
Foreign currency adjustments	22.3	(70.9)
Benefit plans (net of tax of $(0.2) and $(0.6), respectively)	0.4	1.0
Other comprehensive income (loss)	21.9	(62.1)
Comprehensive income including noncontrolling interests	456.1	228.8
Deduct comprehensive income attributable to noncontrolling interests, principally in AmeriGas Partners	(68.3)	(60.2)
Comprehensive income attributable to UGI Corporation	$ 387.8	$ 168.6